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Open Astronomy

formerly Baltic Astronomy

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Volume 26, Issue 1

Issues

Meet the family − the catalog of known hot subdwarf stars

Stephan Geier
  • Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, D 72076 Tübingen, Germany
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Roy H. Østensen
  • Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield,MO65804, United States of America
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  • De Gruyter OnlineGoogle Scholar
/ Peter Nemeth
  • Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ulrich Heber
  • Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Nicola P. Gentile Fusillo / Boris T. Gänsicke / John H. Telting / Elizabeth M. Green
  • Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, United States of America
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Johannes Schaffenroth
  • Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-12-29 | DOI: https://doi.org/10.1515/astro-2017-0432

Abstract

In preparation for the upcoming all-sky data releases of the Gaia mission, we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalog contains 5613 unique sources and provides multi-band photometry from the ultraviolet to the far infrared, ground based proper motions, classifications based on spectroscopy and colors, published atmospheric parameters, radial velocities and light curve variability information. Using several different techniques, we removed outliers and misclassified objects. By matching this catalog with astrometric and photometric data from the Gaia mission, we will develop selection criteria to construct a homogeneous, magnitude-limited all-sky catalog of hot subdwarf stars based on Gaia data. As first application of the catalog data, we present the quantitative spectral analysis of 280 sdB and sdOB stars from the Sloan Digital Sky Survey Data Release 7. Combining our derived parameters with state-of-the-art proper motions, we performed a full kinematic analysis of our sample. This allowed us to separate the first significantly large sample of 78 sdBs and sdOBs belonging to the Galactic halo. Comparing the properties of hot subdwarfs from the disk and the halo with hot subdwarf samples from the globular clusters ! Cen and NGC 2808, we found the fraction of intermediate He-sdOBs in the field halo population to be significantly smaller than in the globular clusters.

Keywords : stars: subdwarfs; stars: horizontal branch; catalogs

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About the article

Received: 2017-09-26

Accepted: 2017-10-23

Published Online: 2017-12-29

Published in Print: 2017-12-20


Citation Information: Open Astronomy, Volume 26, Issue 1, Pages 164–168, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0432.

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© 2018. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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