Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..137r&link_type=abstract
In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M
Astronomy and Astrophysics
Astrophysics
Mira Variables, Shocks, Extrasolar Planets
Scientific paper
In Mira-type stars the optical emission lines and molecular maser lines (SiO, H2O, OH) probe different layers of the stellar atmospheres and circumstellar envelopes, affected by shock waves. Balmer emission appears slightly above the stellar photosphere. As the shock reaches the masering region in the circumstellar envelope, the SiO and H2O maser intensity grows. The lack of the radio continuum, expected to accompany the Hα emission in Miras, probably indicates that the source of the Balmer emission lines is small, e.g., connected with an active region on the star or with a shock generated by a close low-mass companion.
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