Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.15
M. Dimitrijević, M. Christova, S. Sahal-Bréchot
. Stark broadening parameters, line widths and shifts, have been calculated for spectral lines within Fe XXV 3s 2 S J -3p 2 P oJ (cid:48) multiplet, by using the impact semiclassical perturbation theory. The obtained results have been used to demonstrate, that in spite of big differences of line width values expressed as usual in ˚A, they are practically the same when expressed in angular frequency units. This confirms that in the case of Fe XXV spectral lines we can use the known Stark broadening parameters, expressed in angular frequency units, to obtain the unknown ones, for other lines in the same multiplet. The obtained data are particularly interesting for neutron star atmospheres and environment investigation and modelling as well as for inertial fusion plasma.
{"title":"On the similarities of Stark broadening parameters within a Fe XXV multiplet","authors":"M. Dimitrijević, M. Christova, S. Sahal-Bréchot","doi":"10.31577/caosp.2022.52.3.15","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.15","url":null,"abstract":". Stark broadening parameters, line widths and shifts, have been calculated for spectral lines within Fe XXV 3s 2 S J -3p 2 P oJ (cid:48) multiplet, by using the impact semiclassical perturbation theory. The obtained results have been used to demonstrate, that in spite of big differences of line width values expressed as usual in ˚A, they are practically the same when expressed in angular frequency units. This confirms that in the case of Fe XXV spectral lines we can use the known Stark broadening parameters, expressed in angular frequency units, to obtain the unknown ones, for other lines in the same multiplet. The obtained data are particularly interesting for neutron star atmospheres and environment investigation and modelling as well as for inertial fusion plasma.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44421125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.25
M. Dimitrijević, M. Christova, S. Sahal-Bréchot
. Our calculations for Stark broadening parameters of Si II spectral lines obtained using impact semiclassical perturbation theory are compared with experimental data from the literature. Presented data are needed for the evaluation of the physical conditions of stellar plasma, siliciabundance deter-mination, opacity calculations, stellar spectra analysis and synthesis, stellar atmosphere modelling etc.
{"title":"Stark broadening of Si II spectral lines: comparison with experimental results","authors":"M. Dimitrijević, M. Christova, S. Sahal-Bréchot","doi":"10.31577/caosp.2022.52.3.25","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.25","url":null,"abstract":". Our calculations for Stark broadening parameters of Si II spectral lines obtained using impact semiclassical perturbation theory are compared with experimental data from the literature. Presented data are needed for the evaluation of the physical conditions of stellar plasma, siliciabundance deter-mination, opacity calculations, stellar spectra analysis and synthesis, stellar atmosphere modelling etc.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43437209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.90
V. Srećković, L. Ignjatović, M. Dimitrijević
. We investigated the electron-impact processes involving hydrogen, lithium and sodium molecular cations. Rate coefficients for the dissociative recombination in domains of principal quantum numbers n ≥ 4 and temperatures from 500 K to 10 000K are reported. Considered collisional processes have an impact on the ionization level and atom excited-state populations as well on optical characteristics. The data are useful for the modeling of the kinetics of the Early Universe and for geocosmical plasma investigation.
{"title":"Electron-impact processes involving small molecular ions relevant for the astrochemistry","authors":"V. Srećković, L. Ignjatović, M. Dimitrijević","doi":"10.31577/caosp.2022.52.3.90","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.90","url":null,"abstract":". We investigated the electron-impact processes involving hydrogen, lithium and sodium molecular cations. Rate coefficients for the dissociative recombination in domains of principal quantum numbers n ≥ 4 and temperatures from 500 K to 10 000K are reported. Considered collisional processes have an impact on the ionization level and atom excited-state populations as well on optical characteristics. The data are useful for the modeling of the kinetics of the Early Universe and for geocosmical plasma investigation.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44005722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.116
D. Petković, O. Odalović, A. Nina
. Recent research indicates that the influence of the ionospheric D-region on the propagation of satellite signals cannot be ignored during the intense X-radiation emitted during solar X-ray flares. In this paper, we investigate the influence of changes in the solar hydrogen Ly α radiation, which is manifested in variations of the D-region electron density and, consequently, the total electron content in this region, on the propagation of the Global Navigation Satellite System (GNSS) signals. We consider changes during a solar cycle and year, represented by the smoothed daily sunspot number and the day of year. The obtained results indicate that the influence of the D-region on these signals is not negligible for positioning with a single signal recorded by a single receiver during the period around the maximum of a solar cycle.
{"title":"Influence of the solar hydrogen Lyα line on the GNSS signal delay in the ionospheric D-region","authors":"D. Petković, O. Odalović, A. Nina","doi":"10.31577/caosp.2022.52.3.116","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.116","url":null,"abstract":". Recent research indicates that the influence of the ionospheric D-region on the propagation of satellite signals cannot be ignored during the intense X-radiation emitted during solar X-ray flares. In this paper, we investigate the influence of changes in the solar hydrogen Ly α radiation, which is manifested in variations of the D-region electron density and, consequently, the total electron content in this region, on the propagation of the Global Navigation Satellite System (GNSS) signals. We consider changes during a solar cycle and year, represented by the smoothed daily sunspot number and the day of year. The obtained results indicate that the influence of the D-region on these signals is not negligible for positioning with a single signal recorded by a single receiver during the period around the maximum of a solar cycle.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49537199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.71
V. Vujčić, V. Srećković, D. Jevremovic
. In this paper, ACol database for the collisional processes in atom and Rydberg atom collisions is described. Database (DB) is hosted and is a part of the Serbian Virtual Observatory (SerVO) and VAMDC project. The database contains the rate coefficients for excitation and ionization collisional processes in hydrogen, helium and alkali plasmas. The ACol dataset could help with the investigation and modeling of laboratory low temperature plasmas as well as weakly ionized layers in various atmospheres and cosmic objects.
{"title":"New database for collisional excitation/ ionization processes of astrophysical interest","authors":"V. Vujčić, V. Srećković, D. Jevremovic","doi":"10.31577/caosp.2022.52.3.71","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.71","url":null,"abstract":". In this paper, ACol database for the collisional processes in atom and Rydberg atom collisions is described. Database (DB) is hosted and is a part of the Serbian Virtual Observatory (SerVO) and VAMDC project. The database contains the rate coefficients for excitation and ionization collisional processes in hydrogen, helium and alkali plasmas. The ACol dataset could help with the investigation and modeling of laboratory low temperature plasmas as well as weakly ionized layers in various atmospheres and cosmic objects.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46745557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.78
Z. Nikitovic, Z. Raspopovic
{"title":"Transport coefficients for He+ ions in mixtures He/CF4: modeling laboratory and astrophysical plasmas","authors":"Z. Nikitovic, Z. Raspopovic","doi":"10.31577/caosp.2022.52.3.78","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.78","url":null,"abstract":"","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41434201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.97
N. Sakan, I. Traparić, V. Srećković, M. Ivković
. Artificial neural networks are gaining a momentum for solving complex problems in all sorts of data analysis and classification matters. As such, idea of determining their usability on complex plasma came up. The choice for the input data for the analysis is a set of stellar spectral data. It consists of complex composition plasma under vast variety of conditions, dependent on type of star, measured with calibrated standardized procedures and equipment. The results of the analysis has shown that even a simple type of perceptron artificial neural network could lead to results of acceptable quality for the analysis of spectra of complex composition. The analyzed ANNs performed good on a limited data set. The results can be interpreted as a figure of merit for further development of complex neural networks in various applications e.g. in astrophysical and fusion plasmas.
{"title":"The usage of perceptron, feed and deep feed forward artificial neural networks on the spectroscopy data: astrophysical & fusion plasmas","authors":"N. Sakan, I. Traparić, V. Srećković, M. Ivković","doi":"10.31577/caosp.2022.52.3.97","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.97","url":null,"abstract":". Artificial neural networks are gaining a momentum for solving complex problems in all sorts of data analysis and classification matters. As such, idea of determining their usability on complex plasma came up. The choice for the input data for the analysis is a set of stellar spectral data. It consists of complex composition plasma under vast variety of conditions, dependent on type of star, measured with calibrated standardized procedures and equipment. The results of the analysis has shown that even a simple type of perceptron artificial neural network could lead to results of acceptable quality for the analysis of spectra of complex composition. The analyzed ANNs performed good on a limited data set. The results can be interpreted as a figure of merit for further development of complex neural networks in various applications e.g. in astrophysical and fusion plasmas.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45621726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.31577/caosp.2022.52.2.58
X.F. Zhao
. An effect of the contributions from σ ∗ and φ mesons on the surface gravitational redshift of PNS PSR J0740+6620 is studied with relativistic mean field theory in consideration of a baryon octet. We find that the energy density ε increases relative to the same pressure p as the contributions from σ ∗ and φ mesons are taken into account. Relative to the same central energy density, the radius R of the PNS increases while the mass M , the mass radius ratio M/R and the surface gravitational redshift z of the PNS decrease, taking into account the contributions from σ ∗ and φ mesons. Under the constraint of mass M =2.08 M (cid:12) , considering the contributions from σ ∗ and φ mesons, for the PNS PSR J0740+6620, the radius decreases by about -0.08%, the central energy density increases by about 0.89%, the central pressure increased by about 0.76%, the mass radius ratio increases by about 0.08%, and the surface gravitational redshift increases by about 0.17% from z =0.31663 to z =0.31718.
.在考虑重子八隅体的情况下，用相对论平均场理论研究了σ*和φ介子对PNS PSR J0740+6620表面引力红移的影响。我们发现，考虑到σ*和φ介子的贡献，能量密度ε相对于相同的压力p增加。相对于相同的中心能量密度，考虑到σ*和φ介子的贡献，PNS的半径R增加，而PNS的质量M、质量半径比M/R和表面引力红移z减小。在质量M=2.08M（cid:12）的约束下，考虑到σ*和φ介子的贡献，PNS PSR J0740+6620的半径减小约0.08%，中心能量密度增加约0.89%，中心压力增加约0.76%，质量半径比增加约0.08%，并且表面重力红移从z＝0.31663增加到z＝0.31718大约0.17%。
{"title":"The interaction between hyperons and the surface gravitational redshift of proto neutron star PSR J0740+6620","authors":"X.F. Zhao","doi":"10.31577/caosp.2022.52.2.58","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.2.58","url":null,"abstract":". An effect of the contributions from σ ∗ and φ mesons on the surface gravitational redshift of PNS PSR J0740+6620 is studied with relativistic mean field theory in consideration of a baryon octet. We find that the energy density ε increases relative to the same pressure p as the contributions from σ ∗ and φ mesons are taken into account. Relative to the same central energy density, the radius R of the PNS increases while the mass M , the mass radius ratio M/R and the surface gravitational redshift z of the PNS decrease, taking into account the contributions from σ ∗ and φ mesons. Under the constraint of mass M =2.08 M (cid:12) , considering the contributions from σ ∗ and φ mesons, for the PNS PSR J0740+6620, the radius decreases by about -0.08%, the central energy density increases by about 0.89%, the central pressure increased by about 0.76%, the mass radius ratio increases by about 0.08%, and the surface gravitational redshift increases by about 0.17% from z =0.31663 to z =0.31718.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46882926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.31577/caosp.2022.52.2.25
M. Vavrukh, D. Dzikovskyi, S. Smerechynskyi
. The objects of research are three recently discovered white dwarfs from binary systems with rapid axial rotation and masses M ≤ M (cid:12) . The geometrical and mechanical characteristics (moment of inertia, equatorial gravity, the condition of stability in relation to rotation) are calculated for the white dwarf V1460 Her within an electron-nuclear model, based on the equilibrium equation and inferred from observations mass and period of axial rotation. Estimates of model parameters and macroscopic characteristics for inferred from observations periods of rotation are performed for white dwarfs LAMOST
{"title":"Inverse problem of white dwarfs theory with rapid axial rotation","authors":"M. Vavrukh, D. Dzikovskyi, S. Smerechynskyi","doi":"10.31577/caosp.2022.52.2.25","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.2.25","url":null,"abstract":". The objects of research are three recently discovered white dwarfs from binary systems with rapid axial rotation and masses M ≤ M (cid:12) . The geometrical and mechanical characteristics (moment of inertia, equatorial gravity, the condition of stability in relation to rotation) are calculated for the white dwarf V1460 Her within an electron-nuclear model, based on the equilibrium equation and inferred from observations mass and period of axial rotation. Estimates of model parameters and macroscopic characteristics for inferred from observations periods of rotation are performed for white dwarfs LAMOST","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45399189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.31577/caosp.2022.52.2.44
A. Kravtsova, S. Barabanov, I. Volkov
. We present observations of six asteroids crossing the orbit of Mars obtained at Mt. Koshka observatory of INASAN in 2014–2016. Our multicolor photometry made it possible to determine the apparent magnitudes of asteroids in BVRcIc photometric bands, as well as their taxonomic class according to Tholen’s classification. The periods of rotation were determined for asteroids 9773, 32575, 97679, and 313591. For asteroid 8355 Masuo the rotation period determined earlier was confirmed. Our observations support the long period of rotation for asteroid 122463 (presumably about 19 days).
{"title":"Photometric observations of six Mars-crossing asteroids with the 1-m INASAN telescope at Mt. Koshka","authors":"A. Kravtsova, S. Barabanov, I. Volkov","doi":"10.31577/caosp.2022.52.2.44","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.2.44","url":null,"abstract":". We present observations of six asteroids crossing the orbit of Mars obtained at Mt. Koshka observatory of INASAN in 2014–2016. Our multicolor photometry made it possible to determine the apparent magnitudes of asteroids in BVRcIc photometric bands, as well as their taxonomic class according to Tholen’s classification. The periods of rotation were determined for asteroids 9773, 32575, 97679, and 313591. For asteroid 8355 Masuo the rotation period determined earlier was confirmed. Our observations support the long period of rotation for asteroid 122463 (presumably about 19 days).","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44619921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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