Pub Date : 1999-09-01DOI: 10.1017/S1539299600021080
D. Kotnik-Karuza, R. Jurdana-Šepić
Our high-resolution optical spectroscopic survey of the symbiotic star CH Cyg, extending over the quiescent period 1987 - 1989 between two outbursts, shows that the spectrum did not completely lose its symbiotic character. Moreover, signs of radiation of the hot source were present, not only as remnants from the previous outburst, but also as an indication of a new one. Some of the evidences which support this idea are following: • Variation of excitation and vibration temperatures of neutral metals and TiO moleculs respectively • Untypical microturbulent velocity dependance of the excitation potential of the lower state for Fe I • Double-peaked Balmer profiles of Ha and Hb with temporary disappearance of the central absorption • Presence of forbbiden emission lines [FeII] [ SII] [NeIII] together with OIII with complex profile and variable intensity.
{"title":"Search for Signs of a New Outburst in the Quiescent State of CH Cygni","authors":"D. Kotnik-Karuza, R. Jurdana-Šepić","doi":"10.1017/S1539299600021080","DOIUrl":"https://doi.org/10.1017/S1539299600021080","url":null,"abstract":"Our high-resolution optical spectroscopic survey of the symbiotic star CH Cyg, extending over the quiescent period 1987 - 1989 between two outbursts, shows that the spectrum did not completely lose its symbiotic character. Moreover, signs of radiation of the hot source were present, not only as remnants from the previous outburst, but also as an indication of a new one. Some of the evidences which support this idea are following: • Variation of excitation and vibration temperatures of neutral metals and TiO moleculs respectively • Untypical microturbulent velocity dependance of the excitation potential of the lower state for Fe I • Double-peaked Balmer profiles of Ha and Hb with temporary disappearance of the central absorption • Presence of forbbiden emission lines [FeII] [ SII] [NeIII] together with OIII with complex profile and variable intensity.","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127954073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-20DOI: 10.1017/S1539299600019730
S. Oliver
Surveys with ISO (Kessler et al 1996), in particular with the CAM (Cesarsky et al 1996) and PHOT (Lemke et al 1996) instruments, will greatly extend our understanding of extra-galactic populations and their cosmological evolution. The main advantages that ISO surveys have over e.g IRAS are increased sensitivity/depth and wavelength coverage. Within the Guaranteed and Open Time programmes there are many field surveys which will efficiently map the limits in these parameters. In this talk I will briefly overview those surveys before concentrating in more detail on one survey in particular, the ISO survey of the Hubble Deep Field (HDF), to illustrate the kind of results that can be expected.
使用ISO (Kessler et al 1996)，特别是使用CAM (Cesarsky et al 1996)和PHOT (Lemke et al 1996)仪器进行调查，将极大地扩展我们对星系外人口及其宇宙演化的理解。ISO测量相对于例如IRAS的主要优点是增加了灵敏度/深度和波长覆盖范围。在保证时间和开放时间方案中，有许多实地调查将有效地确定这些参数的限制。在这次演讲中，我将简要概述这些调查，然后再详细介绍一项调查，即ISO对哈勃深空(HDF)的调查，以说明可以预期的结果。
{"title":"Deep Surveys and Cosmology","authors":"S. Oliver","doi":"10.1017/S1539299600019730","DOIUrl":"https://doi.org/10.1017/S1539299600019730","url":null,"abstract":"Surveys with ISO (Kessler et al 1996), in particular with the CAM (Cesarsky et al 1996) and PHOT (Lemke et al 1996) instruments, will greatly extend our understanding of extra-galactic populations and their cosmological evolution. The main advantages that ISO surveys have over e.g IRAS are increased sensitivity/depth and wavelength coverage. Within the Guaranteed and Open Time programmes there are many field surveys which will efficiently map the limits in these parameters. In this talk I will briefly overview those surveys before concentrating in more detail on one survey in particular, the ISO survey of the Hubble Deep Field (HDF), to illustrate the kind of results that can be expected.","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122162965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1997-11-28DOI: 10.1017/S1539299600019754
D. Elbaz
The evolution of galaxy clusters from their formation due to the merging of sub structures, the bulk of star formation and subsequent chemical enrichment of the intra-cluster medium, is expected to be quite recent (z<1-2) in the hierarchical clustering scenario (White & Prenk 1991).
{"title":"Infrared Observations of Galaxy Clusters","authors":"D. Elbaz","doi":"10.1017/S1539299600019754","DOIUrl":"https://doi.org/10.1017/S1539299600019754","url":null,"abstract":"The evolution of galaxy clusters from their formation due to the merging of sub structures, the bulk of star formation and subsequent chemical enrichment of the intra-cluster medium, is expected to be quite recent (z<1-2) in the hierarchical clustering scenario (White & Prenk 1991).","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"2009 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127333918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1997-11-20DOI: 10.1017/S1539299600018761
V. Lipunov
The simulated rates of NS+NS, NS+BH and BH+BH mergings are considered in relation with the problem of GRBursts origin and gravitational waves detection.
考虑了NS+NS、NS+BH和BH+BH合并的模拟速率与gr暴起源和引力波探测问题的关系。
{"title":"Population Synthesis of High Energy Transients: Relativistic Binary Merging Rates","authors":"V. Lipunov","doi":"10.1017/S1539299600018761","DOIUrl":"https://doi.org/10.1017/S1539299600018761","url":null,"abstract":"The simulated rates of NS+NS, NS+BH and BH+BH mergings are considered in relation with the problem of GRBursts origin and gravitational waves detection.","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125432492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1997-11-17DOI: 10.1007/978-94-011-4778-1_1
D. Heggie, M. Giersz, R. Spurzem, K. Takahashi
{"title":"Dynamical Simulations: Methods and Comparisons","authors":"D. Heggie, M. Giersz, R. Spurzem, K. Takahashi","doi":"10.1007/978-94-011-4778-1_1","DOIUrl":"https://doi.org/10.1007/978-94-011-4778-1_1","url":null,"abstract":"","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"72 1-3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120918010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1997-11-10DOI: 10.1017/S1539299600020025
U. F. Alvensleben
Abundance Ratios are observed in a wide variety of instances addressed in this volume: in Gas and Stars, Simple Stellar Populations (SSPs) like star clusters, and, finally, in Composite Stellar Populations (CSPs) like E/SO galaxies (Bulges, spheroidal galaxies, Merger Remnants, etc.) on which the focus of this contribution will be. I’ll briefly review the observational situation and the current interpretation and then cast some doubt on the latter from our own chemically consistent spectrophotometric modelling results.
{"title":"Abundance Ratios in Composite Stellar Populations with Special Emphasis on Elliptical Galaxies","authors":"U. F. Alvensleben","doi":"10.1017/S1539299600020025","DOIUrl":"https://doi.org/10.1017/S1539299600020025","url":null,"abstract":"Abundance Ratios are observed in a wide variety of instances addressed in this volume: in Gas and Stars, Simple Stellar Populations (SSPs) like star clusters, and, finally, in Composite Stellar Populations (CSPs) like E/SO galaxies (Bulges, spheroidal galaxies, Merger Remnants, etc.) on which the focus of this contribution will be. I’ll briefly review the observational situation and the current interpretation and then cast some doubt on the latter from our own chemically consistent spectrophotometric modelling results.","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129966628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1997-10-24DOI: 10.1017/S153929960002181X
M. Colless, B. Boyle
This IAU Joint Discussion proposes to address the subject of redshift surveys in the 21st century. This paper, however, deals with two major new redshift surveys that those involved sincerely hope will be completed in the 20th century. Nonetheless, these surveys are relevant to the topic of the meeting, as they clearly foreshadow the scope and style of redshift surveys, if not in the coming millennium, at least in the coming decade. The surveys are being carried out with the new Two Degree Field (2dF) facility on the Anglo-Australian Telescope (AAT), a 400-fibre multi-object spectrograph with the capability, as described in Section 2, to increase the size of redshift surveys by an order of magnitude over current best efforts. The main scientific goals, survey strategy and some preliminary results from the 2dF Galaxy Redshift Survey are outlined in Section 3, while Section 4 similarly describes the 2dF QSO Redshift Survey. Further information can be found on the WWW at http://www.aao.gov.au/2df/ for the 2dF facility, at http://msowww.anu.edu.au/~colless/2dF/ for thegalaxy survey and at http://www.aao.gov.au/local/www/rs/qso_surv.html for the QSO survey.
{"title":"Redshift Surveys With 2DF","authors":"M. Colless, B. Boyle","doi":"10.1017/S153929960002181X","DOIUrl":"https://doi.org/10.1017/S153929960002181X","url":null,"abstract":"This IAU Joint Discussion proposes to address the subject of redshift surveys in the 21st century. This paper, however, deals with two major new redshift surveys that those involved sincerely hope will be completed in the 20th century. Nonetheless, these surveys are relevant to the topic of the meeting, as they clearly foreshadow the scope and style of redshift surveys, if not in the coming millennium, at least in the coming decade. The surveys are being carried out with the new Two Degree Field (2dF) facility on the Anglo-Australian Telescope (AAT), a 400-fibre multi-object spectrograph with the capability, as described in Section 2, to increase the size of redshift surveys by an order of magnitude over current best efforts. The main scientific goals, survey strategy and some preliminary results from the 2dF Galaxy Redshift Survey are outlined in Section 3, while Section 4 similarly describes the 2dF QSO Redshift Survey. Further information can be found on the WWW at http://www.aao.gov.au/2df/ for the 2dF facility, at http://msowww.anu.edu.au/~colless/2dF/ for thegalaxy survey and at http://www.aao.gov.au/local/www/rs/qso_surv.html for the QSO survey.","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131803225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1997-10-20DOI: 10.1007/978-94-011-4778-1_7
S. Zwart, C. Tout, Hyung-Mok Lee
{"title":"Stellar Evolution and Dynamics in Star Clusters","authors":"S. Zwart, C. Tout, Hyung-Mok Lee","doi":"10.1007/978-94-011-4778-1_7","DOIUrl":"https://doi.org/10.1007/978-94-011-4778-1_7","url":null,"abstract":"","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121934881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1997-10-02DOI: 10.1017/S153929960001875X
S. Zwart, Frank Verbunt Ene Ergma
We study the formation of low-mass X-ray binaries with a black hole as accreting object. The performed semi-analytic analysis reveals that the formation rate of black holes in low-mass X-ray binaries is about two orders of magnitude smaller than that of systems with a neutron star as accretor. This is contradicted by the six observed systems, which are all transients, which suggest that the majority of these systems has not been seen jet. The birthrate for both type of objects are expected to be similar (for reviews see Cowley 1992, Tanaka & Lewin 1995).
{"title":"Formation of Low-Mass Black Hole X-Ray Transients","authors":"S. Zwart, Frank Verbunt Ene Ergma","doi":"10.1017/S153929960001875X","DOIUrl":"https://doi.org/10.1017/S153929960001875X","url":null,"abstract":"We study the formation of low-mass X-ray binaries with a black hole as accreting object. The performed semi-analytic analysis reveals that the formation rate of black holes in low-mass X-ray binaries is about two orders of magnitude smaller than that of systems with a neutron star as accretor. This is contradicted by the six observed systems, which are all transients, which suggest that the majority of these systems has not been seen jet. The birthrate for both type of objects are expected to be similar (for reviews see Cowley 1992, Tanaka & Lewin 1995).","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124914482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1997-09-01DOI: 10.1017/S153929960002027X
P. Duc, F. Mirabel
We review the observational evidences for tidal dwarf galaxies, a class of small galaxies formed out of the tidal debris of collisions between massive galaxies. Tidal dwarfs are found far from the interacting parent galaxies, associated with massive clouds of atomic hydrogen located at the tip of long tidal tails. These newly formed galaxies are among the best cases for the study of galaxy formation in the nearby Universe.
{"title":"Tidal Dwarf Galaxies","authors":"P. Duc, F. Mirabel","doi":"10.1017/S153929960002027X","DOIUrl":"https://doi.org/10.1017/S153929960002027X","url":null,"abstract":"We review the observational evidences for tidal dwarf galaxies, a class of small galaxies formed out of the tidal debris of collisions between massive galaxies. Tidal dwarfs are found far from the interacting parent galaxies, associated with massive clouds of atomic hydrogen located at the tip of long tidal tails. These newly formed galaxies are among the best cases for the study of galaxy formation in the nearby Universe.","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133477592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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