Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0914m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #09.14; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
The mass-loss rates of hot, massive, luminous stars are considered a decisive parameter in shaping their evolutionary tracks and influencing the interstellar medium on galactic scales. The small-scale structures (clumps) omnipresent in such winds may reduce empirical estimates of mass-loss rates by an evolutionarily significant factor of >=3. So far, there has been no direct observational evidence that the wind-clumping may persist at the same level in environments with a low ambient metallicity, where the wind-driving opacity is reduced. Here we report an unambiguous detection of small-scale inhomogeneities in the winds of three Population I Wolf-Rayet stars in the Small Magellanic Clouds, where metallicity is 1/5 Zsolar. The general properties of the detected clumps, such as their velocity dispersions, emissivities and average accelerations, closely match the corresponding characteristics of small-scale inhomogeneities in the winds of Galactic Wolf-Rayet stars.
Bouret JC
Depagne E.
Foellmi Cédric
Marchenko Sergey
Martins Fabrice
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