The Mv-W(H-gamma) calibration for O6 to A3 supergiants

Details The Mv-W(H-gamma) calibration for O6 to A3 supergiants The Mv-W(H-gamma) calibration for O6 to A3 supergiants

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98.1186h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Nov. 1986, p. 1186-1192.

Astronomy and Astrophysics

Astronomy

12

Star Clusters, Stellar Luminosity, Stellar Spectra, Supergiant Stars, Calibrating, Main Sequence Stars

Scientific paper

The Mv-W(H-gamma) calibration of main-sequence stars of Millward and Walker (1985) is evaluated by observing bright supergiants in clusters. Fifty-two spectra of 39 O, B, and A supergiants combined with 19 higher dispersion spectra of 18 stars are studied. Wing profiles were generated by fitting a two-component, absorption-coefficient model to the H-gamma profiles. The calculated Mv data are compared to photometric values. It is observed that there is a difference in the present calibration and the Millward and Walker calibration due to the manner in which the wing profiles are defined; however, the nonlinear relation between the spectral types and W(H-gamma) found by Millward and Walker is confirmed.

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