Light variations of massive stars (Alpha Cygni variables). XI - The behaviour of the S Doradus type stars AG Carinae and HR Carinae near minimum light

Details Light variations of massive stars (Alpha Cygni variables). XI - The behaviour of the S Doradus type stars AG Carinae and HR Carinae near minimum light Light variations of massive stars (Alpha Cygni variables). XI - The behaviour of the S Doradus type stars AG Carinae and HR Carinae near minimum light

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26as...82..189v&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 82, no. 2, Feb. 1990, p. 189-200.

Astronomy and Astrophysics

Astrophysics

26

Eclipsing Binary Stars, Light Curve, Stellar Luminosity, Supergiant Stars, Variable Stars, Interstellar Extinction, Stellar Magnitude, Stellar Oscillations, Stellar Spectrophotometry, Stellar Temperature

Scientific paper

VBLUW photometry of the microvariations of AG Car (1987/1988) and HR Car (1981/1982 and 1987/1988) and of the macrovariations of HR Car (1984/1987) is presented and discussed. Both objects, although at or close to minimum light, show small S Dor eruptions corresponding to an increase in the mass loss rate of about 20 percent. The time scale of these eruptions, presumably 0.5-1 yr, is thus much longer than the quasi-periods of the intrinsic variations. Therefore, independency between both phenomena is suggested. The reddening and luminosity of HR Car is discussed, as well as its temperature. A tentative estimation of T(eff) based on the fluctuation in the color indices, amounts to about 14,000 K + or - 2000 K. The absolute bolometric magnitude = -9.5 m.

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