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Photometric sample of early B-type pulsators in eclipsing binaries observed with TESS 用 TESS 观测的食双星中早期 B 型脉冲星的光度样本
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.70
C.I. Eze, G. Handler
. Asteroseismology coupled with eclipsing binary modelling shows great potential in improving the efficiency of measurements or calibrations of the interior mixing profile in massive stars. This helps, for instance in treating the challenging and mysterious discrepancies between observations and models of its stellar structure and evolution. This paper discusses the findings in our work titled β Cephei pulsators in eclipsing binaries observed with TESS , which aimed to compile a comprehensive catalogue of β Cep pulsators in eclipsing binaries. Seventy-eight (78) pulsators of the β Cep type in eclipsing binaries among which 59 new discoveries were reported. Here, we also report a fresh analysis of eight additional stars that were outside the scope of the earlier-mentioned work. Six β Cep pulsators in eclipsing binaries are reported, among which 5 are new discoveries and 1 is a confirmation of a candidate earlier suggested in the literature. Our sample allows for future ensemble asteroseismic modelling of massive pulsators in eclipsing binaries to treat the discrepancy between observations and models.
.小行星地震学与食双星建模相结合,在提高大质量恒星内部混合模型的测量或校准的效率方面显示出巨大的潜力。例如,这有助于处理其恒星结构和演化的观测数据与模型之间存在的具有挑战性的神秘差异。本文讨论了我们利用 TESS 观测到的蚀变双星中的 β Cephei 脉动器的发现,这项工作的目的是编制一份蚀变双星中 β Cep 脉动器的综合目录。共报告了 78 个食双星中的β Cep 型脉冲星,其中 59 个是新发现的。在这里,我们还报告了对另外八颗恒星的新分析,这些恒星不在先前提到的工作范围之内。我们报告了食双星中的 6 颗 β Cep 脉动器,其中 5 颗是新发现的,1 颗是对文献中早先提出的候选者的证实。我们的样本为今后对食双星中的大质量脉冲星进行集合小行星地震建模提供了条件,以处理观测数据与模型之间的差异。
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引用次数: 0
TYC 1083-12-1 -- an SB2 binary mimicking an exoplanetary candidate TYC 1083-12-1 -- 模仿系外行星候选者的 SB2 双星
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.182
M. Skarka, J. Lipták, D. Stoklásek, P. Cagaš, P. Kabáth
. TYC 1083-12-1 (sp. type F8V) was identified as a potential ex-oplanetary candidate in the data from a photometric survey with a 30-cm telescope. From the radial velocity observations of the star, we found that it is a double-lined binary with very similar components. We present the basic parameters of this system.
.TYC 1083-12-1(sp. type F8V)在用 30 厘米望远镜进行的光度测量数据中被确定为潜在的前太阳系候选星。通过对这颗恒星的径向速度观测,我们发现它是一个双线双星,其成分非常相似。我们给出了这个系统的基本参数。
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引用次数: 0
First determination of the system parameters in five contact binaries 首次测定五个接触双星的系统参数
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.164
B. Dębski, L. Kulczycka, W. Skrobacz, J. Pęgiel, M. Jacak
. We present solutions of the BVRI-light curve numerical modeling for five low-mass ratio totally eclipsing contact binary stars. One object required the introduction of a cool star spot to the best-fitting model. Only one object returned a solution with a hotter secondary component. None of the objects required the introduction of a third component.
.我们介绍了五颗低质量比全食接触双星的 BVRI-光曲线数值建模解决方案。其中一个天体需要在最佳模型中引入一个冷星点。只有一个天体返回了带有较热次级成分的解决方案。没有一个天体需要引入第三个成分。
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引用次数: 0
Discovery of star systems at the merger limit by large astronomical surveys 通过大型天文巡天发现处于合并极限的恒星系统
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.249
P. Christopoulou, E. Lalounta, A. Papageorgiou, C. E. Ferreira Lopes, M. Catelan, A.J. Drake
. This study presents the identification and the best photometric so-lution of 92 low mass ratio (LMR) totally eclipsing contact binaries in Catalina Sky Survey data, among which 37 are new discoveries, six are candidates for mergers, and a unique ultra-short period LMR
.这项研究展示了卡塔琳娜巡天数据中 92 个低质量比(LMR)全食接触双星的识别和最佳光度测定。
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引用次数: 0
V1006 Cyg: SU UMa-type dwarf nova in the period gap that wobbles between subclasses V1006 Cyg:在亚类之间摇摆的周期间隙中的 SU UMa 型矮新星
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.117
E. Pavlenko, S. Shugarov, T. Kato, O. Antonyuk, A. Sosnovskij, Ju. Babina, A. Shchurova, K. Isogai, A. Sklyanov, A. Gutaev, R. Zhuchkov, P. Dubovský, K. Petrik, J. Hambsch
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引用次数: 0
Low-mass contact binaries as probes of stellar merging events 作为恒星合并事件探测器的低质量接触双星
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.58
K. Gazeas
. Gravitational interaction is important for nearly every aspect of Astrophysics. Theoretical models are tough tested in cases where strong, stellar winds, angular momentum loss, and mass transfer take place in the course of stellar evolution within a common envelope. Stellar interaction impacts the formation and evolution of diverse types of binary and multiple stellar systems. Therefore, evolution in a binary (and a multiple) stellar environment is still an open question in Astrophysics while contact binaries are challenging the well-established and solid theories that concern thermal equilibrium and orbital stability. There is a vast number of such systems observed in the Milky Way and the Magellanic Clouds. Systematic (independent or combined) observations, all-sky surveys, ground-based and space telescopes have offered very detailed photometric and spectroscopic information about these systems. Special attention is given when extreme cases are observed, such as ultra-short orbital period contact binaries or extremely low mass ratio systems. These cases can give insights into the physical and orbital parameters of low-mass contact binaries and their temporal variations. For example, one can investigate the orbital period modulation, the spot activity, and the possibility of contact bi-naries to host planets, as well as predict a stellar merger, red nova events, and a possible connection with exotic stellar populations such as blue stragglers. The purpose of this work is to present the recent developments in observations of low-mass contact binaries, highlighting the most important findings, in combination with existing theories. The research of such systems, at an international level, is constantly challenging our current knowledge of stellar interactions and advances our understanding of stellar dynamics in common envelope and contact phases.
.引力相互作用对天体物理学的几乎所有方面都很重要。在一个共同包层内的恒星演化过程中,会发生强恒星风、角动量损失和质量转移,在这种情况下,理论模型受到了严峻的考验。恒星相互作用影响着各种类型的双星和多恒星系统的形成和演化。因此,双星(和多星)环境中的演化仍然是天体物理学中的一个悬而未决的问题,而接触双星正在挑战有关热平衡和轨道稳定性的成熟而坚实的理论。在银河系和麦哲伦云中观测到了大量这样的系统。系统(独立或联合)观测、全天空巡天、地面和太空望远镜为这些系统提供了非常详细的测光和光谱信息。当观测到极端情况时,比如超短轨道周期接触双星或质量比极低的系统,会受到特别关注。这些情况可以让我们深入了解低质量接触双星的物理和轨道参数及其时间变化。例如,我们可以研究轨道周期调制、光斑活动和接触双星寄宿行星的可能性,还可以预测恒星合并、红新星事件以及与蓝杂星等奇异恒星群的可能联系。这项工作的目的是结合现有理论,介绍低质量接触双星观测的最新进展,突出最重要的发现。国际上对这类系统的研究不断挑战着我们目前对恒星相互作用的认识,并推进了我们对普通包膜和接触阶段恒星动力学的理解。
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引用次数: 0
Eclipse timing variations of evolved eclipsing binaries: potential targets for meter-sized telescopes in the light of TESS observations 演化蚀日双星的蚀时变化:根据 TESS 观测结果,米级望远镜的潜在目标
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.228
E. M. Esmer, ¨O. Ba¸st¨urk, S. O. Selam, F. Akar, E. Sertkan, B. G¨uler, S. Yal¸cınkaya
. Evolved eclipsing binaries, featuring a white dwarf or a subdwarf companion on relatively short orbital periods of a few hours, exhibit interesting characteristics in their eclipse timing variations (ETV), analysis of which brings several advantages. Firstly, their small total masses enable us to detect substel-lar mass objects by observing the light-time effect, due to a subtle wobbling of the binary system around the barycenter. Additionally, the short orbital periods of these binaries allow for the accumulation of a large dataset comprising numerous observations, facilitating rigorous analysis and enhancing statistical significance. Moreover, their minima profiles have symmetric V-shapes in most cases, which decrease the uncertainties in the measurements of minima timings. In this study, we collect and analyze all available photometric data from the Transiting Exoplanet Survey Satellite (TESS), using observation cadences of both 20 and 120 seconds for such systems identified by various surveys. Our sample includes more than 60 evolved eclipsing binaries, whose primaries are either white dwarf or subdwarf companions. By calculating mid-eclipse timings, we construct detailed ETV diagrams and apply the Lomb-Scargle period analysis to determine the amplitudes and periods of their ETVs.
.演化中的食双星有一个白矮星或一个亚矮星伴星,它们的轨道周期相对较短,只有几个小时,它们的食时变化(ETV)表现出有趣的特征,分析这些特征有几个好处。首先,由于双星系统围绕双子中心发生微妙的摆动,它们的总质量较小,因此我们可以通过观测光时效应来探测亚质量天体。此外,这些双星的轨道周期很短,可以积累大量观测数据,便于进行严格分析,提高统计意义。此外,在大多数情况下,这些双星的极小时间图都是对称的 V 形,这就降低了极小时间测量的不确定性。在这项研究中,我们收集并分析了来自 Transiting Exoplanet Survey Satellite(TESS)的所有可用光度数据,利用 20 秒和 120 秒两种观测频率,对各种巡天发现的此类系统进行了观测。我们的样本包括 60 多个演化食双星,它们的主星都是白矮星或亚矮星伴星。通过计算中食时间,我们构建了详细的ETV图,并应用伦布-斯卡格尔周期分析法确定了它们的ETV振幅和周期。
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引用次数: 0
Spotted eclipsing binary KIC 7023917 with δ-Scuti pulsations 具有δ-Scuti脉冲的点蚀双星KIC 7023917
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.194
Pavol Gajdoš, Š. Parimucha, M. Kamenec
. Eclipsing binary KIC 7023917 is one of nearly three thousand other binaries in the well-known Kepler Eclipsing Binary Catalog. However, it has some uncommon features. We focused on this system because we detected fast anti-correlated changes on the O-C diagram which could suggest the presence of apsidal motion. However, these changes are very fast for apsidal motion and the orbit of this binary is circular. Detailed analysis of the Kepler and TESS light curves reveals deformation of the light curve by short-periodic pulsations and the O’Connell effect caused by stellar spot(s). Here, we present our initial study of this system and a possible explanation of the observed O-C diagram.
.食双星 KIC 7023917 是著名的开普勒食双星目录中近三千个其他双星之一。不过,它有一些不常见的特征。我们之所以关注这个系统,是因为我们在O-C图上检测到了快速的反相关变化,这可能暗示着存在天体运动。然而,这些变化对于天体运动来说是非常快的,而且这个双星的轨道是圆形的。对开普勒和TESS光曲线的详细分析显示,短周期脉动和恒星光斑引起的奥康奈尔效应会导致光曲线变形。在这里,我们将介绍对这个系统的初步研究,以及对观测到的O-C图的可能解释。
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引用次数: 0
Spectroscopic characterization of superflares on solar-type stars -- a joint observing campaign 太阳型恒星超耀斑的光谱特征--联合观测活动
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.190
M. Leitzinger, P. Kabáth, M. Vaňko, T. Pribulla, R. Komžík, Z. Garai, R. Karjalainen, P. Odert, J. Lipták, P. Heinzel, J. Wollmann, R. Greimel, E.W. Guenther
. During the last decade numerous superflares have been detected on solar-type stars using broadband photometry from the Kepler and TESS satellites. Still the spectroscopic exploration of this high-energy phenomenon is lacking. This exploration would
.在过去的十年中,开普勒和 TESS 卫星利用宽带光度计在太阳型恒星上探测到了大量的超级火星。但对这种高能现象的光谱学探索仍然缺乏。这种探索将
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引用次数: 0
Nova Herculi 2021 as an intermediate polar 海尔库利新星 2021 作为中间极地
Pub Date : 2024-02-01 DOI: 10.31577/caosp.2024.54.2.128
P. Dubovský, K. Petrík, V. Breus
. We report the results of observations of Nova Herculi 2021 - V1674 Her. The object is characterized by several exceptional properties. The progenitor was identified as an intermediate polar. The speed of the outflow reached 10000 km s − 1 . The brightness decline was exceptionally rapid: t 2 ∼ = 1 . 2 d , t 3 ∼ = 3 d . The pulse spin signal was detected in photometry soon after the nova eruption. Extremely fast spin-up of the white dwarf rotation was measured. Despite challenges in cycle counting, we successfully constructed the O - C diagram of spin pulse maxima based on three seasons of observations. The result suggests a stable spin acceleration, with an anticipated gradual decline over the next decades. Additionally, we investigated the evolution of the orbital period.
.我们报告了对赫库利新星 2021 - V1674 Her 的观测结果。该天体具有一些特殊的性质。原生星被确定为中极星。外流速度达到 10000 公里/秒-1。亮度下降异常迅速:t 2 ∼ = 1 . 2 d,t 3 ∼ = 3 d。脉冲自旋信号在新星爆发后不久就在光度测量中被探测到了。测量到了白矮星旋转的极速自旋。尽管在周期计数方面存在挑战,我们还是根据三季的观测结果成功地构建了自旋脉冲最大值的O - C图。结果表明,白矮星的自旋加速度比较稳定,预计在未来几十年内会逐渐下降。此外,我们还研究了轨道周期的演变。
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引用次数: 0
期刊
Contributions of the Astronomical Observatory Skalnaté Pleso
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