Fingerprinting 85% of Galactic Suspects: A New K-M Dwarf Spectral Sequence

Details Fingerprinting 85% of Galactic Suspects: A New K-M Dwarf Spectral Sequence Fingerprinting 85% of Galactic Suspects: A New K-M Dwarf Spectral Sequence

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110318r&link_type=abstract

American Astronomical Society, AAS Meeting #211, #103.18; Bulletin of the American Astronomical Society, Vol. 39, p.922

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of a project to develop a new set of spectral standards for the extremely common K and M main sequence stars, as a component of the ongoing NStars and RECONS Projects. This new sequence was developed using red spectra (6000-9000 Å) taken at CTIO, as opposed to the traditional blue, desirable for cool stars whose luminosities peak in the red/near-infrared regions of the spectrum. In addition to the sequence itself, we have also created an automated spectral typing code to assist the process of comparing new spectra to our standards, which will be provided to the community through the NStars and RECONS websites.
Modifications incorporated into this new system include (a) ten full K types and nineteen M half-types selected from our database of 900 stars, (b) careful analysis of the K to M type transition region, (c) links and consistency checks between spectral types derived using blue and red spectra, and (d) photometric checks to ensure none of our standards are binaries. Our classification criterion were based on traditional line and band measurements, with additional constraints from the blackbody slopes of the spectra. Our standards compare well with V-K photometric colors as well as luminosities determined using photometry and trigonometric parallaxes, thereby providing a spectroscopic system that also works photometrically.
This work was supported by NSF grant AST 05-07711, Georgia State University, and the SMARTS Consortium, through which many of the observations were obtained using the 1.5m CTIO telescope.

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