Discovery of a highly ionized, low mass-loss wind and a corona seen in absorption in the G9 II star HR 6902

Details Discovery of a highly ionized, low mass-loss wind and a corona seen in absorption in the G9 II star HR 6902 Discovery of a highly ionized, low mass-loss wind and a corona seen in absorption in the G9 II star HR 6902

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..133r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 1, Jan. 1990, p. 133-140.

Astronomy and Astrophysics

Astrophysics

16

Eclipsing Binary Stars, G Stars, Red Giant Stars, Stellar Coronas, Stellar Winds, Absorption Spectra, B Stars, Cool Stars, Ionized Gases, Iue, Stellar Spectra

Scientific paper

IUE observations of HR 6902 (G9II + B9V) 1 and 2 days before and during total eclipse of the B star are discussed. The G bright giant has a highly ionized, hot (Te = 87,000 K) wind seen as C IV, Si IV, and C II resonance-line scattering of B-star photons during totality, with a mass-loss rate of 2 x 10 to the -11th solar mass/yr (+ or - factor 3). It is the first cool giant in which a hot wind has been detected. HR 6902 is also the first cool star in which a 'corona' is seen in absorption in C IV, Si IV, C II, and Fe III lines. In a line of sight corresponding to an effective height of 0.06 G-star radii, the Te is 58,000 K.

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