Color excesses, intrinsic colors, and absolute magnitudes of Galactic and Large Magellanic Cloud Wolf-Rayet stars

Journal Article · Wed Aug 01 04:00:00 EDT 1990 · Astrophysical Journal, Supplement Series; (USA)

DOI:https://doi.org/10.1086/191485· OSTI ID:6479881

Vacca, W D; Torres-Dodgen, A V ^[1]

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1. Joint Institute for Laboratory Astrophysics, Boulder, CO (USA) Monterey Institute for Research in Astronomy, CA (USA)

A new method of determining the color excesses of WR stars in the Galaxy and the LMC has been developed and is used to determine the excesses for 44 Galactic and 32 LMC WR stars. The excesses are combined with line-free, narrow-band spectrophotometry to derive intrinsic colors of the WR stars of nearly all spectral subtypes. No correlation of UV spectral index or intrinsic colors with spectral subtype is found for the samples of single WN or WC stars. There is evidence that early WN stars in the LMC have flatter UV continua and redder intrinsic colors than early WN stars in the Galaxy. No separation is found between the values derived for Galactic WC stars and those obtained for LMC WC stars. The intrinsic colors are compared with those calculated from model atmospheres of WR stars and generally good agreement is found. Absolute magnitudes are derived for WR stars in the LMC and for those Galactic WR stars located in clusters and associations for which there are reliable distance estimates. 78 refs.

• OSTI ID: 6479881
• Journal Information: Astrophysical Journal, Supplement Series; (USA), Journal Name: Astrophysical Journal, Supplement Series; (USA) Vol. 73; ISSN APJSA; ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COLOR
COMPARATIVE EVALUATIONS
DISTANCE
GALAXIES
INTERSTELLAR SPACE
LINE WIDTHS
MAGELLANIC CLOUDS
MAIN SEQUENCE STARS
MILKY WAY
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
SPACE
SPECTRA
SPECTROPHOTOMETRY
STAR CLUSTERS
STARS
ULTRAVIOLET SPECTRA
WOLF-RAYET STARS