Gaia Calibrated UV Luminous Stars in LAMOST
Yu Bai, JiFeng Liu, Song Wang

TL;DR
This paper presents a catalog of ultraviolet luminous stars identified using Gaia DR2 data, focusing on stars with significant UV excess, and cross-matching with variable star and binary catalogs to facilitate stellar activity and binary system studies.
Contribution
The study introduces a new catalog of UV luminous stars calibrated with Gaia data, including a large sample with minimized observational biases, and cross-identifies them with variable and binary star catalogs.
Findings
275 FUV luminous stars identified
1774 NUV luminous stars identified
62% and 16% of the sample are RR Lyr and white dwarf binaries
Abstract
We take advantage of the Gaia data release 2 to present 275 and 1,774 ultraviolet luminous stars in the FUV and the NUV. These stars are 5 exceeding the centers of the reference frame that is built with over one million UV stars in the log vs diagram. The Galactic extinction is corrected with the 3D dusty map. In order to limit the Lutz-Kelker effect to an insignificant level, we select the stars with the relative uncertainties of the luminosity less than 40% and the trigonometric parallaxes less than 20%. We cross-identified our sample with the catalogs of RR Lyr stars and possible white dwarf main-sequence binaries, and find they compose 62% and 16% of our sample in the FUV and NUV, respectively. This catalog provides a unique sample to study stellar activity, spectrally unresolved compact main-sequence binaries and variable stars.
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