Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360l..51r&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. L51-L54.
Astronomy and Astrophysics
Astronomy
61
Photosphere, Red Giant Stars, Stimulated Emission, Variable Stars, Water Masers, Astronomical Maps, Radio Astronomy, Very Large Array (Vla), Very Long Base Interferometry
Scientific paper
Radio continuum and H2O maser emission have been detected from the semiregular variable W Hya. The continuum emission at radio frequencies probably comes from the outer photosphere of the red giant star. A partial resolution of the stellar disk shows it to be approximately 0.09 arcsec in diameter. The H2O maser emission arises from a ring of diameter 0.3 arcsec that is well centered on the star. These results for the first time yield a clear detection of a stellar photosphere at radio frequencies (except for the sun) and a radio measurement of the size of a stellar disk. Also, these are the first observations that precisely locate circumstellar maser emission with respect to the exciting star, allowing a detailed modeling of the maser amplification. The H2O masers are unsaturated, amplify spontaneous emission, and are highly beamed.
Menten Karl. M.
Reid Mark J.
No associations
LandOfFree
A subarcsecond H2O maser shell surrounding a variable star does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A subarcsecond H2O maser shell surrounding a variable star, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A subarcsecond H2O maser shell surrounding a variable star will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1401382