Laurent Eyer, Lovro Palaversa, Nami Mowlavi, Pierre Dubath, Richard I. Anderson, Dafydd W. Evans, Thomas Lebzelter, Vincenzo Ripepi, Laszlo Szabados, Silvio Lec… 展开作者
Laurent Eyer, Lovro Palaversa, Nami Mowlavi, Pierre Dubath, Richard I. Anderson, Dafydd W. Evans, Thomas Lebzelter, Vincenzo Ripepi, Laszlo Szabados, Silvio Leccia, Gisella Clementini
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9 pages, 1 figure. Accepted for publication in Astrophysics and Space Science. Following a presentation at the conference The Fundamental Cosmic Distance Scale: State of the Art and the Gaia Perspective, Naples, May 2011
The ESA Gaia mission will bring a new era to the domain of standard candles. Progresses in this domain will be achieved thanks to unprecedented astrometric precision, whole-sky coverage and the combination of photometric, spectrophotometric and spectroscopic measurements. The fundamental outcome of the mission will be the Gaia catalogue produced by the Gaia Data Analysis and Processing Consortium (DPAC), which will contain a variable source classification and specific properties for stars of specific variability types. We review what will be produced for Cepheids, RR Lyrae, Long Period Variable stars and eclipsing binaries.
Improving reddening estimates for RR Lyrae stars in the Gaia bands: a machine learning approach to the PAC(Z) relation
INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚天文与空间科学观测站);Dipartimento di Fisica e Astronomia, Università di Bologna(博洛尼亚大学物理与天文系)
Unveiling the Sagittarius Dwarf Spheroidal Galaxy Core with Gaia DR3: A Red Clump Distance Precise to 2%
The University of Texas at Austin(德克萨斯大学奥斯汀分校);Whitman College(惠特曼学院);Institute for Astronomy, University of Hawai‘i(夏威夷大学天体物理研究所);Texas Christian University(得克萨斯基督教大学);Maunakea Spectroscopic Explorer, Canada-France-Hawaii-Telescope(莫纳克亚光谱巡天项目,加拿大法国夏威夷望远镜)
Constraints on the Distance Moduli, Helium and Metal Abundances, and Ages of Globular Clusters From Their RR Lyrae and Non-Variable Horizontal-Branch Stars. III. M55 and NGC 6362
The Population of Pulsating Variable Stars in the Sextans Dwarf Spheroidal Galaxy
智利托洛洛山美洲天文台的布兰科望远镜用暗能量照相机对六分仪矮球状星系的一个7平方度的大扩展区进行了变星观测。我们报告了7颗异常造父变星、199颗天琴座RR星和16颗矮造父变星。这只是第五个星系外的矮造父变星已被系统地搜索。尽管如此,新的恒星增加了来自不同环境的恒星的普查,可以用来评估使用矮造父变星作为标准烛光的优势和局限性,因为这些恒星的金属丰度不一定是已知的。在六分仪座发现的矮造父变星的平均周期为0.066天,平均$g$振幅为0.87磁等。它们位于水平分支的下方,跨度为0.8等,介于$21.9 < g < 22.7$之间。与船底座等其他星系相比,六分仪座中的矮造父变星数量较少,而船底座星系拥有大量的中年人口。另一方面,天琴座RR型恒星与矮造父变星的数量和比例与玉夫座非常相似,玉夫座是一个像六分仪座一样被古老的恒星星族所控制的星系。在六分仪中发现的造父矮星遵循一个很好的周期-光度关系,在$g$波段的均方根=0.05等,这是通过锚定到由天琴座RR型恒星给出的距离模量而建立的。虽然六分仪座中的大多数变星都位于星系的中心,但我们在星系的外围发现了2颗天琴座RR星和1颗异常造父变星,它们可能是潮汐外恒星,表明该星系可能正在经历潮汐破坏。这些可能的潮外变星与六分仪座有着相同的自行,正如最近的盖亚测量所看到的。
A Galactic Perspective on the (Unremarkable) Relative Refractory Depletion Observed in the Sun
Dartmouth College(达特茅斯学院);Carnegie Science Observatories(卡内基科学天文台);Research School of Astronomy & Astrophysics, Australian National University(澳大利亚国立大学天体物理学与天文学研究学院);Trinity University(三一大学);Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado(科罗拉多大学天体物理与行星科学系天体物理与空间天文中心);Center for Computational Astrophysics, Flatiron Institute(平顿研究所计算天体物理中心);University of Texas at Austin(德克萨斯大学奥斯汀分校)