Millimeter recombination lines towards Eta Carinae

Details Millimeter recombination lines towards Eta Carinae Millimeter recombination lines towards Eta Carinae

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295l..39c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 2, p. L39-L42

Astronomy and Astrophysics

Astronomy

13

Continuous Spectra, Emission Spectra, H Lines, Hydrogen Recombinations, Radiative Transfer, Radio Astronomy, Radio Spectra, Extremely High Frequencies, Masers, Millimeter Waves, Stellar Winds

Scientific paper

We report the detection of the millimeter recombination lines H 40-alpha, H 30-alpha, H 29-alpha, H 50-Beta and H 37-Beta towards Eta Carinae (Eta Car). All the recombination lines show a similar line profile. A strong narrow component is seen at a velocity of Vlsr approximately -50 km/s, significantly blue-shifted with respect to the systemic velocity of Eta Car (-16 km/s). Underlying this main component a very broad emission is also detected in the alpha lines, extending from approximately -200 to approximately 100 km/s. The profiles are markedly asymmetrical in the sense of enhanced blue-shifted emission both in the narrow and the broad features. We argue that most of the red-shifted emission is absorbed by the optically thick, strong radio continuum of the ionized stellar wind of Eta Car and that the millimeter recombination lines are affected by maser emission. This is supported by simple model calculations for the radiation transfer of the line and continuum emission in Eta Car.

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