Evidence for a yellow-supergiant phase of AG Carinae

Details Evidence for a yellow-supergiant phase of AG Carinae Evidence for a yellow-supergiant phase of AG Carinae

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..330r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 330-342.

Astronomy and Astrophysics

Astrophysics

18

Stellar Evolution, Stellar Mass Ejection, Supergiant Stars, Blue Stars, Stellar Structure

Scientific paper

Following recent coronographic observations of gas and dust surrounding the Luminous Blue Variable AG Carinae displaying a variety of dynamical structures, we investigate the past evolutionary history of this object on the basis of the standard dynamical model for the interaction of a hot stellar outflow with a slower wind from an earlier evolutionary phase. We show that a continuous mass loss is a most viable mechanism by which the star can produce the observed massive shell of ionized gas and dust. In particular we estimate a typical mass loss rate 1-4 x 10 exp -4 solar masses/yr and a terminal wind velocity V in the range 20-40 km/s for the 'pre-LBV' phase. These values allow us to locate the AG Car precursor in the yellow-supergiant region of the HR diagram.

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