High-sensitivity recombination-line observations of W49A. I - The hydrogen alpha-lines

Details High-sensitivity recombination-line observations of W49A. I - The hydrogen alpha-lines High-sensitivity recombination-line observations of W49A. I - The hydrogen alpha-lines

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..162v&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Nov. 15, 1979, p. 162-167.

Astronomy and Astrophysics

Astronomy

2

Astronomical Spectroscopy, H Alpha Line, Hydrogen Clouds, Hydrogen Recombinations, Radio Sources (Astronomy), Early Stars, Stellar Mass Ejection

Scientific paper

The H85alpha, H100/101alpha and H140alpha recombination lines observed in the direction of W49A are shown to be non-Gaussian. Deconvolution of the line profiles reveals one component at 61 km/s from a foreground cloud. Arguments are given to show why the remaining profile can be best fitted with a Gaussian component and one due to an expanding sphere of gas with an expansion velocity of 35 km/s. The latter is identified with a feature of diameter 8 pc and is evidence for a phase of mass-loss from a massive early-type star at the rate of about 1.7 x 10 to the -5th solar masses/yr, during the past 70,000 years.

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