Detection of H I emission from the circumstellar envelope of Alpha Orionis

Details Detection of H I emission from the circumstellar envelope of Alpha Orionis Detection of H I emission from the circumstellar envelope of Alpha Orionis

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..305b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 305-314.

Astronomy and Astrophysics

Astrophysics

40

Cool Stars, Emission Spectra, Hot Stars, Hydrogen, Orion Constellation, Stellar Envelopes, Abundance, Cosmochemistry, Interstellar Gas, Mass Transfer

Scientific paper

Sensitive VLA observations of the evolved stars α Ori and IRC +10216 have resulted in the detection of 21 cm H I emission from the envelope formed by mass loss from α Ori. The data are subject to difficulties and uncertainties caused by the strong galactic H I line in this direction; the observed H I flux gives a mass-loss rate of ≡2.2×10-6(D/200 pc)2M_sun; yr-1 and an envelope radius of ≡1arcmin(1.8×1017cm at D = 200 pc). Comparison with molecular line, infrared, radio continuum, and optical data shows that the gas-to-dust ratio in the circumstellar outflow has ≡10 - 20 times the interstellar value. No H I emission was detected from IRC +10216. The implications of these results for circumstellar and interstellar chemistry are discussed.

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