Publ. Astron. Soc. Pac., 131, part no 11, 4201-114201 (2019/November-0)
A GALEX far-ultraviolet study of dwarf stars in moving groups.
COCHRANE K.M. and SMITH G.H.
Abstract (from CDS):
Far-ultraviolet (FUV) GALEX photometry of main-sequence stars in moving groups is used to verify that there is a relationship between age and FUV broadband magnitude among such stars. Samples of dwarf stars were compiled for twelve moving groups and a search made for both GALEX FUV magnitudes on the AB system and Johnson BV photometry. These data sets were used to calculate a (FUV - B) color index for each star, which in turn was plotted against B - V in a two-color diagram. Based on the loci that the group dwarfs define in this two-color space, there is strong evidence that among candidate members of the Hyades, HR 1614, Wolf 630, Ursa Major, Arcturus, AB Doradus, η Cephei, β Pictoris, and Tucana-Horologium moving groups there are populations of coeval stars. Evidence for coevality is weaker in the case of the ζ Herculis group, and no conclusion can be drawn for candidate stars that have previously been assigned to the Kapteyn's Star and σ Puppis groups. Polynomials of up to fifth order were fitted to the two-color loci of the dwarfs in each group. These fits were used to calculate fiducial values of (FUV - B) throughout a range in B - V color on the main sequence for most of the groups studied here. Evidence is found that at a fixed B - V there is a logarithmic dependence of (FUV - B) color on stellar age for FGK dwarfs. The relationships presented herein could potentially serve as a tool for estimating the ages of late-type Population I dwarf stars.
© 2019. The Astronomical Society of the Pacific. All rights reserved.
eta Cep and Moving Group not in SIMBAD.
View the references in ADS
To bookmark this query, right click on this link: simbad:2019PASP..131k4201C and select 'bookmark this link' or equivalent in the popup menu