Magnetic activity in stellar merger products

Noam Soker*, Romuald Tylenda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

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 Lx ∼ 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.

Original languageEnglish
Pages (from-to)909-912
Number of pages4
JournalMonthly Notices of the Royal Astronomical Society
Volume375
Issue number3
DOIs
StatePublished - Mar 2007
Externally publishedYes

Keywords

  • Binaries: general
  • Stars: individual: V838 Mon
  • Stars: magnetic fields
  • Supergiants

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