Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297..168c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. 168-174
Astronomy and Astrophysics
Astrophysics
65
Continuous Radiation, Emission Spectra, Infrared Radiation, Millimeter Waves, Radio Emission, Infrared Spectra, Radio Spectra, Stellar Mass, Stellar Winds, Thermal Emission
Scientific paper
Using the SEST telescope we have mapped the lambda 1.3-mm and 2.9-mm continuum emission around Eta Carinae eta Car), the peculiar star belonging to the open cluster Trumpler 16 in the Carina Nebula. The maps are dominated by a central source whose position coincides with eta Car. Extended millimeter continuum emission is detected both at lambda 1.3 and 2.9-mm. This emission traces the optically thin free-free emission from the gas ionized by the nearby massive luminous stars of Trumpler 16. In 1992, the flux density of eta Car were 15.8 +/- 1.9 Jy at lambda 1.3-mm and 4.9 +/- 0.7 Jy at 2.9-mm. From an analysis of the spectrum from the near-infrared to the decimeter radio range, we show that the millimeter emission of eta Car is dominated by thermal emission from the ionized stellar wind. The infrared emission is dominated by dust radiation with temperatures ranging from 200 to 400 K. The total luminosity is LIR = 5 x 106 solar luminosity. Based on the millimeter flux densities measured in 1992, we derived a mass-loss rate of approximately 2.4 x 10-3 solar mass/yr. Measurements obtained during the time interval from 1991 to 1994 indicate strong flux density variations at both millimeter wvelengths. We suggest that these variations are related to episodic shell ejections leading to variations in the degree of ioniztion in the wind of eta Car.
Bronfman Leonard
Cox Pierre
Haslam G.
Kreysa Ernst
Mezger Peter G.
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