Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....75..351n&link_type=abstract
Astronomy and Astrophysics, vol. 75, no. 3, June 1979, p. 351-364. Research supported by the Max-Planck-Gesellschaft zur Foerde
Astronomy and Astrophysics
Astrophysics
75
Hydroxyl Emission, Interstellar Masers, Mira Variables, Stellar Envelopes, Stellar Luminosity, Variable Stars, Cosmic Dust, Gradients, Infrared Radiation, Line Spectra, Stellar Models
Scientific paper
Eleven newly-detected Mira variables in which hydroxyl emission has been detected (OH-Miras), together with the 37 other known sources, are studied in order to investigate OH maser emission from the circumstellar envelopes of Mira variables. The search for OH emission from Mira variables was conducted at frequencies of 1612 and 1667 MHz. Peak intrinsic luminosities of the sources are found to range from 5 x 10 to the 15th to 5 x 10 to the 17th W for Type I OH-Miras and from 10 to the 17th to 5 x 10 to the 18th W for Type II OH-Miras. The more luminous Type II sources are considered rarer, and thus are found at greater distances. The mean velocity separation between the two main OH peaks is found to be smaller for OH-Miras than for OH-IR sources, howver the velocity gradient in OH-Mira envelopes is higher. The maser action of OH-Miras can be explained in terms of infrared pumping models in which the main lines are excited by hot dust grains of 350 to 450 K.
Laury-Micoulaut C.
Nguyen-Q-Rieu
Schultz G. V.
Winnberg Anders
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