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AG Carinae: Variability, extinction, distance and luminosity

Published online by Cambridge University Press:  12 April 2016

Henny J.G.L.M. Lamers ,
Nick Hoekzema ,
Norman R. Trams ,
Angelo Cassatella  and
Mike Barylak
Henny J.G.L.M. Lamers
Affiliation:
SRON Laboratory for Space Research, Utrecht, the Netherlands
Nick Hoekzema
Affiliation:
SRON Laboratory for Space Research, Utrecht, the Netherlands
Norman R. Trams
Affiliation:
SRON Laboratory for Space Research, Utrecht, the Netherlands
Angelo Cassatella
Affiliation:
ESA Satellite Tracking Station, Villafranca, Spain
Mike Barylak
Affiliation:
ESA Satellite Tracking Station, Villafranca, Spain

Extract

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AG Car is one of the few Luminous Blue Variables (LBV’s) in our galaxy. The star is a photometric variable which had a recent outburst in 1981 (Whitelock et al., 1983; Wolf and Stahl, 1982) and is surrounded by a resolved ring nebula (Thackeray, 1950; Paresce, 1989). These properties indicate that AG Car is a typical LBV. However, at its canonical distance of 2-2.5 kpc, derived from its assumed membership of the Car OBI or OB2 association, AG Car has a bolometric luminosity of Mbol ⋍ −8.5 to −9.0 and is located significantly below the Humphreys-Davidson limit, and also below the upperlimit for red supergiants (RSG). This implies that AG Car might have been a RSG and that the ring might be due to the interaction of the RSG wind and the LBV wind.

Type
Section II: Poster Papers, A Brief List of Catalogs, and Index
Information
International Astronomical Union Colloquium , Volume 113: Physics of Luminous Blue Variables , 1989 , pp. 271 - 272
Copyright
Copyright © Kluwer 1989

References

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