Magnetic Activity in Stellar Merger Products

Details Magnetic Activity in Stellar Merger Products Magnetic Activity in Stellar Merger Products

2006-09-19

arxiv.org/abs/astro-ph/0609552v2

Mon.Not.Roy.Astron.Soc.375:909-912,2007

Astronomy and Astrophysics

Astrophysics

MNRAS, in press

Scientific paper

10.1111/j.1365-2966.2006.11351.x

We study the expected X-ray luminosity of stellar merger products several years after merger. The X-ray emission is assumed to result from magnetic activity. The extended envelope of the merger product possesses a large convective region and it is expected to rotate fast. The rotation and convection might give rise to an efficient dynamo operation, therefore we expect strong magnetic activity. Using well known relations connecting magnetic activity and X-ray luminosity in other types of magnetically active stars, we estimate that the strong X-ray luminosity will start several years after merger, will reach a maximum of L_x~3x10^{30} erg/sec, and will slowly decline on a time scale of ~100 years. We predict that X-ray emission from V838 Mon which erupted in 2002 will be detected in 2008 with 20 hours of observation.

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