/ftp/cats/J_other/RMxAA/53.439



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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.u-strasbg.fr/viz-bin/VizieR?-source=J/other/RMxAA/53.439
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drwxr-xr-x 29 cats archive 4096 Dec 17 2020 [Up] drwxr-xr-x 3 cats archive 4096 May 26 2021 [TAR file] -rw-r--r-- 1 cats archive 483 Nov 10 2017 .message -r--r--r-- 1 cats archive 3901 Nov 10 2017 ReadMe -rw-r--r-- 1 cats archive 429 Nov 10 2017 +footg5.gif -rw-r--r-- 1 cats archive 4000 Nov 10 2017 +footg8.gif -r--r--r-- 1 cats archive 4250 Nov 9 2017 table1.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 3400 Nov 9 2017 table2.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : J/other/RMxAA/53.439 Gaia stars with GALEX NUV excess (Makarov, 2017) ================================================================================ 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) ================================================================================ 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.

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