Studies of late-type dwarfs. II - A photometric metal abundance index and application to galactic evolution

Details Studies of late-type dwarfs. II - A photometric metal abundance index and application to galactic evolution Studies of late-type dwarfs. II - A photometric metal abundance index and application to galactic evolution

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..778h&link_type=abstract

Astrophysical Journal, Part 1, vol. 214, June 15, 1977, p. 778-784.

Astronomy and Astrophysics

Astrophysics

25

Abundance, Dwarf Stars, Galactic Evolution, Late Stars, Radial Velocity, Stellar Spectrophotometry, Chemical Evolution, Correlation, Stellar Motions

Scientific paper

Photometric and radial-velocity data are presented for 37 southern late-type dwarf stars. With data from the literature for a larger sample of stars, it is shown that late-type subdwarfs have deficiencies of light in the blue region of the spectrum when compared with normal stars of the same (R - I) color. A photometric index that is a measure of the blue deficiency is defined and shown to correlate with the ultraviolet excess. The photometric index is also shown to correlate with the dynamical quantities of the star's orbit in the Galaxy.

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