Main-line OH hot spots in the circumstellar envelope of U Herculis

Details Main-line OH hot spots in the circumstellar envelope of U Herculis Main-line OH hot spots in the circumstellar envelope of U Herculis

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..171s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 171-176.

Astronomy and Astrophysics

Astrophysics

19

Hydroxyl Emission, Interstellar Masers, Mira Variables, Stellar Envelopes, Reference Stars, Stellar Spectra, Very Long Base Interferometry, Water Masers

Scientific paper

The Mira variable star U Herculis was observed in both OH main-lines using the European VLBI Network. It was determined that the most extreme blue-shifted spots in the two maser transitions are coincident. At 1665 MHz, several compact components spread over an area of 0.35 arcsec by 0.7 arcsec were detected; some of them have a compact counterpart at 1667 MHz. Properties of the most blue-shifted compact spot are detailed. They provide support to the interpretation of this spot as the amplified image of the continuum emission from the central star by the front side of the expanding envelope. This result partly confirms that the OH emission from Mira variables might be used to link the optical and radio reference systems. The total flux of all the compact spots is much smaller than the flux found in single-dish spectra, implying the maser emission to be mostly generated in structures of scale-sizes larger than 0.06 arcsec. This supports the core-halo models of OH circumstellar masers, at least in the case of this source.

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