Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26as...59..523h&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 59, March 1985, p. 523-555. Research supported by the Sticht
Astronomy and Astrophysics
Astrophysics
111
Hydroxyl Emission, Infrared Stars, Interstellar Masers, Late Stars, Stellar Envelopes, Variable Stars, Mira Variables, Radiant Flux Density, Radio Stars, Supergiant Stars
Scientific paper
The authors present the results of a program in which the flux density of OH masers in late-type stars was measured to determine the variability, its period and amplitude. Normal Mira variables have "radio" periods that are equal to their optical periods (≡400 days). Most of the related, but optically unidentified OH/IR stars have much longer periods, up to ≡2000 days. A significant fraction (25%) of the OH/IR stars shows small amplitude, or no variations. The light curves of different peaks in the line profile of one star have the same periodicity and shape, but differ slightly in phase. From these phase differences linear dimensions of the OH shells can be derived; typical values for the radii are ≡8×1015cm for Mira variables and ≡5×1016cm for OH/IR stars.
Habing Harm J.
Herman Joshua
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