2012A&A...538L...8G -
Astronomy and Astrophysics, volume 538, L8-8 (2012/2-1)
Yellow supergiants as supernova progenitors: an indication of strong mass loss for red supergiants?
GEORGY C.
Abstract (from CDS):
The increasing number of observed supernova events allows for finding the progenitor star even more frequently in archive images. In a few cases, the progenitor star is a yellow supergiant star. The estimated position in the Hertzsprung-Russell diagram of these stars is not compatible with the theoretical tracks of classical single-star models. According to several authors, the mass-loss rates during the red supergiant phase could be underestimated. We study the impact of an increase in these mass-loss rates on the position of 12 to 15M☉ stars at the end of their nuclear lives, in order to reconcile the theoretical tracks with the observed yellow supergiant progenitors. We have performed calculations of 12 to 15M☉ rotating stellar models using the Geneva stellar evolution code. To account for the uncertainties in the mass-loss rates during the RSG phase, we increased the mass-loss rate of the star (between 3 and 10 times the standard one) during that phase and compared the evolution of stars undergoing such high mass-loss rates with models computed with the standard mass-loss prescription. We show that the final position of the models in the Hertzsprung-Russell diagram depends on the mass loss they undergo during the red supergiant phase. With an increased mass-loss rate, we find that some models end their nuclear life at positions that are compatible with the observed position of several supernova progenitors. We conclude that an increased mass-loss rate (whose physical mechanism still needs to be clarified) allows single-star models to simultaneously reproduce the estimated position in the HRD of the YSG SN progenitors, as well as the SN type.
Abstract Copyright:
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Journal keyword(s):
stars: evolution - stars: mass-loss - stars: massive - supergiants - supernovae: general - stars: rotation
Simbad objects:
6
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