Spectroscopy of the winds from Hubble-Sandage stars in M31 and M33

Details Spectroscopy of the winds from Hubble-Sandage stars in M31 and M33 Spectroscopy of the winds from Hubble-Sandage stars in M31 and M33

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..542k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 542-550.

Astronomy and Astrophysics

Astrophysics

28

Andromeda Galaxy, Spiral Galaxies, Stellar Evolution, Stellar Spectrophotometry, Stellar Winds, Variable Stars, Binary Stars, Emission Spectra, Hot Stars, Main Sequence Stars, Photosphere, Radiation Pressure, Stellar Mass Ejection, Stellar Spectra, Supermassive Stars

Scientific paper

P Cygni profile expansion velocities in four Hubble-Sandage (H-S) stars which lie in the range 150-350 km/s have been measured. Terminal wind velocity estimates are combined with previous derivations of mass-loss rates to determine that the stellar winds in H-S stars carry off 1-5 x 10 to the -5th solar mass/yr, a value low enough so that mass-loss rate cannot be the sole cause of the H-S phenomenon. These dense, low-velocity winds are characteristic of optically thick flows driven by continuum radiation pressure and can be produced, in principle, by either very massive single stars evolving off the main sequence or by massive binary stars undergoing an epoch of rapid mass exchange.

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