Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92...48c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 92, July 1986, p. 48-59.
Astronomy and Astrophysics
Astronomy
107
Early Stars, Magellanic Clouds, Stellar Spectra, Supermassive Stars, Astronomical Catalogs, B Stars, Hertzsprung-Russell Diagram, O Stars, Stellar Color
Scientific paper
We present new split spectral types for 191 O and B stars in the LMC previously having only objective prism data. The spectroscopic and photometric data on the LMC O stars are not yet complete, but we are able to discuss the intrinsic colors and the distance modulus of the LMC. We find that the latter is 18.3 ± 0.3 both from spectroscopic parallax and ZAMS fitting, somewhat smaller than the canonical value of 18.6 and closer to the Schommer et al. (1984) value of 18.2. The intrinsic (U - B)0, (B - V)0 of the O stars hardly differ among themselves and are similar to the values of the earliest B main- sequence stars. This is the first paper in a series on the massive-star content of the Magellanic Clouds; ultimately we plan to derive the massive-star formation rates and initial mass functions directly.
Conti Peter S.
Garmany Catharine D.
Massey Pedro
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