OH/IR stars - Late stages of evolution of intermediate-mass stars

Details OH/IR stars - Late stages of evolution of intermediate-mass stars OH/IR stars - Late stages of evolution of intermediate-mass stars

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..252d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. 252-260.

Astronomy and Astrophysics

Astronomy

32

Hydroxyl Emission, Infrared Astronomy, Interstellar Masers, Late Stars, Radio Astronomy, Stellar Evolution, Infrared Stars, Milky Way Galaxy, Radial Velocity, Stellar Mass Ejection

Scientific paper

Radio and infrared data of a complete subsample of bright OH/IR stars (late-type giants characterized by double-peaked 1612-MHz OH spectra, described as type II OH maser sources) are discussed. The OH maser emission is usually quite intense and unattenuated by interstellar extinction so one can study OH/IR stars throughout a large part of the Galaxy. Furthermore, the radial velocities derived from the OH spectra can be used to determine kinematic distances, and the velocity separation of the two maser peaks in the OH spectra turns out to be a good stellar age indicator. Finally, one can use infrared data of OH/IR stars with well determined distances to derive bolometric luminosities and mass loss rates. The statistical approach outlined is considered promising. Even though the results are far from definitive, it seems clear the mass loss rates in the final stages of stellar evolution of stars with masses in the range of 3 to 8 solar masses (once they have started to thermally pulse or have become pulsationally unstable) are quite a bit larger than previously assumed.

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