Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.5504b&link_type=abstract
American Astronomical Society Meeting 205, #55.04; Bulletin of the American Astronomical Society, Vol. 36, p.1431
Astronomy and Astrophysics
Astronomy
Scientific paper
In our galaxy, M dwarfs are the most abundant stellar objects. They make up over 70% of stars in number and contribute over 40% of the total stellar mass content (Henry et al. 1998). Despite these overwhelming numbers, M dwarfs remain one of the least understood stellar types due to a lack of empirical data concerning their basic parameters, particularly metallicities. Here we present results from an analysis of visual binary star compositions. This analysis shows that the only technique that has been used successfully to determine the metallicity of an M dwarf, the technique of Valenti et al. (1998), is inconsistent with a differential analysis of warmer stars. We discuss possible reasons for these inconsistencies and report our progress to improve the technique. The motivation for this work comes from the importance of metallicity in answering two questions: How does varying metallicity affect the luminosity of M dwarfs; and, is there any correlation between the frequency of the presence of planetary mass compansions around M dwarfs and the host star's metallicity?
Bean Jacob L.
Benedict George F.
Johns-Krull Christopher M.
Sneden Chistopher
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