Magnetic activity in stellar merger products |
| |
| Authors: | Noam Soker Romuald Tylenda |
| |
| Institution: | Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel;Department for Astrophysics, N. Copernicus Astronomical Center, Rabiańska 8, 87-100 Toruń, Poland |
| |
| Abstract: | 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～ 3 × 1030 erg s?1, and will slowly decline on a time-scale of ～100 yr. We predict that X-ray emission from V838 Mon which erupted in 2002 will be detected in 2008 with 20 h of observation. |
| |
| Keywords: | binaries: general stars: individual: V838 Mon stars: magnetic fields supergiants |
|
|
