Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642302w&link_type=abstract
American Astronomical Society, AAS Meeting #216, #423.02; Bulletin of the American Astronomical Society, Vol. 41, p.835
Astronomy and Astrophysics
Astronomy
Scientific paper
We present evidence for an M-dwarf problem that is similar to the previously identified G-dwarf and K-dwarf problems: the number of low-metallicity M-dwarfs is not sufficient to match simple models of Galactic chemical evolution. We estimated the metallicity of over 5000 M-dwarf stars with spectra from the Sloan Digital Sky Survey (SDSS) using a molecular band strength metallicity calibration developed using high resolution spectra of nearby M-dwarfs. Using a sample of M dwarfs with measured magnitudes, parallaxes, and metallicities, we derived a relation that describes the absolute magnitude variation as a function of metallicity. When we examined the metallicity distribution of SDSS stars (after correcting for the different volumes sampled by a magnitude limited survey), we find that there are fewer low-metallicity M-dwarfs than expected from chemical evolution models, with the number of M dwarfs at [Fe/H] -0.5 less than 1% the number at [Fe/H] 0.
West Andrew A.
Woolf Vincent M.
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