Ultraviolet colours of early-type stars

Details Ultraviolet colours of early-type stars Ultraviolet colours of early-type stars

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...102..307b&link_type=abstract

Astronomy and Astrophysics, vol. 102, no. 3, Oct. 1981, p. 307-312.

Astronomy and Astrophysics

Astrophysics

2

A Stars, B Stars, Early Stars, Hertzsprung-Russell Diagram, O Stars, Stellar Spectrophotometry, Ultraviolet Photometry, Main Sequence Stars, Stellar Models, Stellar Spectra, Visible Spectrum

Scientific paper

Possible relations among the characteristics of O, B, and early A type stars previously measured for UV fluxes, and the fluxes measured by the S2/68 experiment onboard the ESRO TD1A satellite, in addition to the spectral classification are investigated. The 220-253, 180-213, and 140-173 nm and broadband photometry centered at 274 nm observations by Thompson et al. (1978) are used to derive a set of extinction-free color indices. UV color indices from observations are discussed, and relations between visible spectral types and the UV color indices are studied. High luminosity B stars are noted to be more reddened than main sequence stars; inconsistencies between the color indices and visible data are taken to indicate possible binarity, high rotational velocity effects, and other peculiarities. The color indices were useful for luminosity indication, heavy element abundance, and temperature information.

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