Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..503h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 2, p. 503-522.
Astronomy and Astrophysics
Astrophysics
85
Infrared Spectroscopy, Milky Way Galaxy, Near Infrared Radiation, Stellar Spectrophotometry, Wolf-Rayet Stars, Hertzsprung-Russell Diagram, Mass To Light Ratios, Spectral Line Width, Stellar Luminosity, Stellar Mass Ejection, Stellar Spectra
Scientific paper
We present high-quality near-IR spectra of 24 Galactic WR stars, of a broad range of subtypes, selected as having known distances. The data cover the region 0.97-1.12 micron and include the 10830-A He I triplet. Measurements of He I and He II lines, together with the absolute magnitudes, yield temperatures, luminosities, mass-loss rates, and terminal velocities for our sample. We extend that sample by including results for a further 12 stars of known distance, taken from the literature. The spectroscopic mass-loss rates are in excellent agreement with those estimated from radio data, and exceed the 'single-scattering limit' by large factors. Mass-loss rates depend only weakly on mass, but there is a statistically significant correlation between surface mass flux and temperature. Terminal velocities correlate loosely with subtype for both WR sequences. Comparison with core-helium-burning mass luminosity tracks suggests that the spectroscopic luminosities may be systematically too faint by about 0.5 dex. We suggest that the WNC stars in our sample may represent an intermediate phase between WNL and WCE subtypes.
Howarth Ian D.
Schmutz Werner
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