Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8719316h&link_type=abstract
Presented at a Workshop on the Late Stages of Stellar Evolution, Calgary, Canada, 2-5 Jun. 1986
Astronomy and Astrophysics
Astronomy
Distance, Interstellar Masers, Stellar Envelopes, Stellar Luminosity, Stellar Structure, Variable Stars, Infrared Astronomy Satellite, Star Distribution, Stellar Evolution
Scientific paper
It is shown that geometrical distances to OH/IR stars, derived from phase lag experiments and maps of the OH brightness distribution, from IRAS are good to 20%. The main contribution to the uncertainty comes from errors in the phase lag radii. Once the phase lags are known with an accuracy less than 10% it will become necessary to look in detail into the structure of the masing shells in order to improve on the distances. The luminosities of OH/IR stars lie in the range 1000 to 10,000 solar luminosities, a slight extension of the range for classical Mira variables. Stars with improbably low or high values of the luminosity are found. The most likely explanation is the uncertainty in the applied correction for interstellar extinction and the often unknown time variation in bolometric magnitude. Also, the sample may contain a few bright Supergiants.
Habing Harm J.
Herman Joshua
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