Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..421z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 2, Feb. 1985, p. 421-430. Sponsorship: Deutsche Forschungsgemeinschaf
Astronomy and Astrophysics
Astrophysics
129
B Stars, Line Spectra, Magellanic Clouds, Peculiar Stars, Spectrum Analysis, Supergiant Stars, Continuous Spectra, Emission Spectra, Radiant Flux Density, Spectral Energy Distribution, Stellar Envelopes, Stellar Mass, Stellar Winds, Ubv Spectra
Scientific paper
An extensive spectroscopic (1150 - 6700 Å) and photometric (UBVRIJHKLMN) study of the peculiar LMC hypergiant R126 has been carried out. The authors derive stellar parameters Teff = 22,500K, R = 72 R_sun; and Mbol = -10.5. The corresponding spectral type is B0.5 Ia+. An estimate of the initial and present mass leads to 70 - 80 M_sun; and ≡40 M_sun;, respectively. Thermal radiation of a cool dust component with Tbb = 900K is observed in the infrared. The hybrid character of the line spectrum, i.e., broad UV resonance absorption lines contrasting sharp emission lines, leads to the conclusion that R126 has a two component stellar wind leading to a disk-like outer configuration. The disk is supposed to be formed by a slow (≡40 km s-1), cool, dense wind. A stellar rotation close to the break-up velocity is regarded as the reason for this two-component structure.
Klare Gerhard
Leitherer Cl.
Stahl Otmar
Wolf Bernd
Zickgraf Franz-Josef
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