IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The WR/LBV system HD 5980 in the Small Magellanic Cloud: What is its evolutionary status?
Autor/es:
KOENIGSBERGER, G.; MORRELL, N. I.; HILLIER, D.; BARBÁ, R.; GAMEN, R. C.
Lugar:
Rodas
Reunión:
Workshop; Massive Stars: From α to Ω; 2013
Institución organizadora:
Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing of the National Observatory of Athens
Resumen:
HD 5980 is located in the Small Magellanic Cloud and consists of two
binary systems which, if physically associated, are very widely
separated. Their orbital periods are 19.3d and 97d and each of these
systems contains very luminous massive stars. The P=19.3d binary is
peculiar in that it consists of two WR stars, one of which underwent an
LBV eruption in 1994. Because this binary is eclipsing and because it
has been monitored since the 1950s, we now have a good grasp on the
fundamental parameters of the LBV component. Particularly noteworthy is
the fact that its bolometric luminosity increased during the 1994
eruption. In this poster we will summarize our current knowledge of HD
5980, including recent results derived from observations at Las Campanas
Observatory which yield an improved orbital solution for the two binary
systems and strong limits on the mass of the LBV. With these data, it
should now be possible to constrain the evolutionary path that has been
followed by the LBV and speculate on its properties as it approaches the
supernova stage.