| Issue |
A&A
Volume 693, January 2025
|
|
|---|---|---|
| Article Number | A214 | |
| Number of page(s) | 5 | |
| Section | Stellar atmospheres | |
| DOI | https://doi.org/10.1051/0004-6361/202452683 | |
| Published online | 17 January 2025 | |
Gaia vbroad: Spectral-line broadening and binarity
1
School of Physics and Astronomy, Tel Aviv University,
Tel Aviv
6997801,
Israel
2
Leiden Observatory, Leiden University,
Einsteinweg 55,
2333 CC
Leiden,
The Netherlands
★ Corresponding authors; eyalhadad@mail.tau.ac.il; brown@strw.leidenuniv.nl
Received:
21
October
2024
Accepted:
6
December
2024
The Gaia DR3 catalogue includes line-broadening measurements (vbroad) for 3 524 677 stars. We concentrate here on the low-mass main-sequence (MS) sub-sample of the catalogue, with (GBP − GRP)0 in the range of 1–1.6, which includes 81 371 sources. The colour-magnitude diagram of the sample displays two distinct strips, the brighter of which is probably mostly composed of unresolved binaries, with mass ratios close to unity. We show that the suspected binary sub-sample displays a larger vbroad distribution, which we attribute to the unresolved absorption lines of the two components of each binary. A similar effect is seen in the GALAH data.
Key words: astronomical databases: miscellaneous / binaries: close
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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