A New Approach to the Calibration of MK Spectral Type with Effective Temperature

Details A New Approach to the Calibration of MK Spectral Type with Effective Temperature A New Approach to the Calibration of MK Spectral Type with Effective Temperature

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18110006g&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #100.06; Bulletin of the American Astronomical Society, Vol. 24, p.1279

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Scientific paper

As part of a continuing program to investigate ways to use synthetic spectra to obtain quantitative information from low to medium resolution stellar spectra, we have classified 61 synthetic spectra against high signal-to-noise CCD spectra of MK standards. The synthetic spectra were computed using the PC-based spectral synthesis program SPECTRUM (Gray 1991) using new Kurucz models having a range in effective temperature expected to span the spectral types B2 to K2 and having a range of gravities believed to be typical of main sequence stars. These synthetic spectra were smoothed to a resolution of 2.8 Angstroms (the resolution of the MK standard spectra) and placed in random order so that neither of us were aware of the effective temperature and gravity of the spectrum during the classification process. Hence, we are able to present an unbiased calibration of the MK spectral class with effective temperature for dwarf stars which is independent of other calibrations. An extension of this calibration to higher luminosity classes and to metal-weak stars is planned. The match between the synthetic spectra and the MK standards was generally good to excellent. Gray, R.O. 1991, BAAS 23, 1382.

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