Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724211a&link_type=abstract
American Astronomical Society, AAS Meeting #217, #242.11; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Collected spectra of nearby stars are used to identify and classify M-Dwarfs according to temperature and metallicity. The stars examined are all located within approximately 50 parsecs of our Sun and were selected from the LSPM-north proper motion catalog. The spectra were collected over dozens of observing runs from telescopes at MDM, Lick and KPNO. We find the spectral classification to be sensitive to radial velocity shifts and variations in instrument sensitivity so in order to obtain a uniform classification, we must correct the spectra to account for these potential effects. In some cases, these effects were great enough that the original classification needed to be adjusted. A final classification was obtained for 3717 M-Dwarfs and 245 K-Dwarfs. The final distribution of these classifications shows objects with subtypes M3 and M4 to be the most common in our sample (over 1,800 spectra). Within the sample of spectra, 9% were classified as metal-poor subdwarfs (181 stars), extreme subdwarfs (100 stars), or ultrasubdwarfs (64 stars).
Alpert Naomi
Lepine Sebastien
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