A large X-ray flare from the Herbig Ae star V892 Tau

Details A large X-ray flare from the Herbig Ae star V892 Tau A large X-ray flare from the Herbig Ae star V892 Tau

2003-10-14

arxiv.org/abs/astro-ph/0310355v1

Astron.Astrophys. 413 (2004) 669-679

Astronomy and Astrophysics

Astrophysics

accepted for publication in A&A (12 pages - 6 figures)

Scientific paper

10.1051/0004-6361:20034151

We report the XMM-Newton observation of a large X-ray flare from the Herbig Ae star V892 Tau. The apparent low mass companion of V892 Tau, V892 Tau NE, is unresolved by XMM-Newton. Nevertheless there is compelling evidence from combined XMM-Newton and Chandra data that the origin of the flare is the Herbig Ae star V892 Tau. During the flare the X-ray luminosity of V892 Tau increases by a factor of ~15, while the temperature of the plasma increases from kT ~ 1.5 keV to kT ~ 8 keV. From the scaling of the flare event, based on hydrodynamic modeling, we conclude that a 500 G magnetic field is needed in order to confine the plasma. Under the assumptions that a dynamo mechanism is required to generate such a confining magnetic field and that surface convection is a necessary ingredient for a dynamo, our findings provide indirect evidence for the existence of a significant convection zone in the stellar envelope of Herbig Ae stars.

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