Gaia Data Release 2 Variable stars in the colour-absolute magnitude diagram
文献类型:期刊论文
作者 | Eyer, L.116; Rimoldini, L.1; Audard, M.116; Anderson, R., I116,117; Nienartowicz, K.1; Glass, F.116; Marchal, O.118; Grenon, M.116; Mowlavi, N.116; Holl, B.116 |
刊名 | ASTRONOMY & ASTROPHYSICS |
出版日期 | 2019-03-13 |
卷号 | 623页码:20 |
ISSN号 | 1432-0746 |
关键词 | stars: general stars: variables: general stars: oscillations binaries: eclipsing surveys methods: data analysis |
DOI | 10.1051/0004-6361/201833304 |
英文摘要 | Context. The ESA Gaia mission provides a unique time-domain survey for more than 1.6 billion sources with G less than or similar to 21 mag. Aims. We showcase stellar variability in the Galactic colour-absolute magnitude diagram (CaMD). We focus on pulsating, eruptive, and cataclysmic variables, as well as on stars that exhibit variability that is due to rotation and eclipses. Methods. We describe the locations of variable star classes, variable object fractions, and typical variability amplitudes throughout the CaMD and show how variability-related changes in colour and brightness induce "motions". To do this, we use 22 months of calibrated photometric, spectro-photometric, and astrometric Gaia data of stars with a significant parallax. To ensure that a large variety of variable star classes populate the CaMD, we crossmatched Gaia sources with known variable stars. We also used the statistics and variability detection modules of the Gaia variability pipeline. Corrections for interstellar extinction are not implemented in this article. Results. Gaia enables the first investigation of Galactic variable star populations in the CaMD on a similar, if not larger, scale as was previously done in the Magellanic Clouds. Although the observed colours are not corrected for reddening, distinct regions are visible in which variable stars occur. We determine variable star fractions to within the current detection thresholds of Gaia. Finally, we report the most complete description of variability-induced motion within the CaMD to date. Conclusions. Gaia enables novel insights into variability phenomena for an unprecedented number of stars, which will benefit the understanding of stellar astrophysics. The CaMD of Galactic variable stars provides crucial information on physical origins of variability in a way that has previously only been accessible for Galactic star clusters or external galaxies. Future Gaia data releases will enable significant improvements over this preview by providing longer time series, more accurate astrometry, and additional data types (time series BP and RP spectra, RVS spectra, and radial velocities), all for much larger samples of stars. |
资助项目 | Switzerland, Swiss State Secretariat for Education, Research and Innovation through the ESA Prodex program ; Switzerland, Mesures d'accompagnement ; Switzerland, Activites Nationales Complementaires ; Switzerland, Swiss National Science Foundation ; Belgium, BELgian federal Science Policy Office (BELSPO) through PRODEX grants ; Italy, Istituto Nazionale di Astrofisica (INAF) ; Italy, Agenzia Spaziale Italiana (ASI)[I/037/08/0] ; Italy, Agenzia Spaziale Italiana (ASI)[I/058/10/0] ; Italy, Agenzia Spaziale Italiana (ASI)[2014-025-R.0] ; Italy, Agenzia Spaziale Italiana (ASI)[2014-025-R.1.2015] ; France, Centre National d'Etudes Spatiales (CNES) ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme[670519] ; Switzerland, Early Postdoc. Mobility fellowship |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | EDP SCIENCES S A |
WOS记录号 | WOS:000461008700002 |
源URL | [http://119.78.226.72/handle/331011/31889] |
专题 | 中国科学院上海天文台 |
通讯作者 | Eyer, L. |
作者单位 | 1.Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland 2.Elecnor Deimos Space ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain 3.UNED, Dept Inteligencia Artificial, C Juan Rosal 16, Madrid 28040, Spain 4.Rutherford Appleton Lab, STFC, Didcot OX11 0QX, Oxon, England 5.Univ Bourgogne Franche Comte, OSU THETA Franche Comte Bourgogne, CNRS, Inst UTINAM UMR6213, F-25000 Besancon, France 6.Isdefe ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain 7.Finnish Geospatial Res Inst FGI, Geodeetinrinne 2, Masala 02430, Finland 8.Univ Helsinki, Dept Phys, POB 64, Helsinki 00014, Finland 9.Space Sci Data Ctr ASI, Via Politecn SNC, I-00133 Rome, Italy 10.Tel Aviv Univ, Dept Geosci, IL-6997801 Tel Aviv, Israel |
推荐引用方式 GB/T 7714 | Eyer, L.,Rimoldini, L.,Audard, M.,et al. Gaia Data Release 2 Variable stars in the colour-absolute magnitude diagram[J]. ASTRONOMY & ASTROPHYSICS,2019,623:20. |
APA | Eyer, L..,Rimoldini, L..,Audard, M..,Anderson, R., I.,Nienartowicz, K..,...&Zwitter, T..(2019).Gaia Data Release 2 Variable stars in the colour-absolute magnitude diagram.ASTRONOMY & ASTROPHYSICS,623,20. |
MLA | Eyer, L.,et al."Gaia Data Release 2 Variable stars in the colour-absolute magnitude diagram".ASTRONOMY & ASTROPHYSICS 623(2019):20. |
入库方式: OAI收割
来源:上海天文台
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