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J/other/RMxAA/53.439 Gaia stars with GALEX NUV excess (Makarov, 2017)
The following files can be converted to FITS (extension .fit or fit.gz)
table1.dat table2.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/other/RMxAA/53.439
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Beginning of ReadMe :J/other/RMxAA/53.439 Gaia stars with GALEX NUV excess (Makarov, 2017)
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Absolute NUV magnitudes of Gaia DR1 astrometric stars and a search for hot
companions in nearby systems.
Makarov V.V.
<Rev. Mex. Astron. Astrofis., 53, 439-448 (2017)>
=2017RMxAA..53..439M (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, nearby ; Stars, double and multiple ; Stars, white dwarf ;
Ultraviolet
Keywords: binaries: general - Hertzsprung-Russell and C-M diagrams -
stars: activity - white dwarfs
Abstract:
Accurate parallaxes from Gaia DR1 (TGAS) are combined with GALEX
visual Nuv magnitudes to produce absolute MNUV magnitudes and an
ultraviolet HR diagram for a large sample of astrometric stars. A
functional fit is derived of the lower envelope main sequence of the
nearest 1403 stars (distance <40pc), which should be reddening-free.
Using this empirical fit, 50 nearby stars are selected with
significant Nuv excess. These are predominantly late K and early M
dwarfs, often associated with X-ray sources, and showing other
manifestations of magnetic activity. The sample may include systems
with hidden white dwarfs, stars younger than the Pleiades, or, most
likely, tight interacting binaries of the BY Dra-type. A separate
collection of 40 stars with precise trigonometric parallaxes and Nuv-G
colors bluer than 2mag is presented. It includes several known novae,
white dwarfs, and binaries with hot subdwarf (sdOB) components, but
most remain unexplored.
Description:
Identities, coordinates, astrometric and photometric data from the
Gaia DR1 and GALEX all-sky catalogs for stars with significant NUV
excess, indicating chromospheric activity in tight binaries, young
age, or hot companions.