Other
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apjs...57...63m&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 57, Jan. 1985, p. 63-76. Research supported by the Natural Scienc
Other
49
Early Stars, H Gamma Line, Star Clusters, Stellar Luminosity, Stellar Spectra, Calibrating, Spectral Line Width, Stellar Evolution, Stellar Rotation
Scientific paper
The W(H-gamma)-M(v) relation for spectral types O to early A of the luminosity classes III-V is calibrated, on the basis of high signal/noise Reticon spectra for 87 members of eight open clusters and associations as well as 37 reliable parallax stars, to a mean probable dispersion of + or - 0.28 mag. Although no spectral type corrections are required, stellar evolution probably affects the construction of the new calibration, so care should be exercised in determinations of distance moduli from slightly evolved cluster sequences. Systematic departures from the calibration may be present for stars with V sin i not less than 220-250 km/sec. A comparison of the new calibration with other early-type ones shows that it is 1.2 mag brighter than Petrie's (1965) H-gamma calibration at spectral type O6, and 0.7 mag brighter at A3.
Millward C. G.
Walker Gordon A. H.
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