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NEW PERSPECTIVES ON THE X-RAY EMISSION OF HD 104237 AND OTHER NEARBY HERBIG Ae/Be STARS FROM XMM-NEWTON AND CHANDRA
 

Summary: NEW PERSPECTIVES ON THE X-RAY EMISSION OF HD 104237 AND OTHER
NEARBY HERBIG Ae/Be STARS FROM XMM-NEWTON AND CHANDRA
Stephen L. Skinner
CASA, University of Colorado, Boulder, CO 80309-0389
Manuel Gu¨del
Paul Scherrer Institut, Wu¨renlingen and Villigen, CH-5232 Switzerland
Marc Audard
Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027
and
Kester Smith
Max Planck Institut fu¨r Radioastronomie, Auf dem Hu¨gel 69, D-53121 Bonn, Germany
Receivved 2003 December 6; accepted 2004 May 19
ABSTRACT
The origin of the X-ray emission from Herbig Ae/Be stars is not yet known. These intermediate-mass pre­main-
sequence stars lie on radiative tracks and are not expected to emit X-rays via solar-like magnetic processes, nor
are their winds powerful enough to produce X-rays by radiative wind shocks as in more massive O-type stars.
The emission could originate in unseen low-mass companions, or it may be intrinsic to the Herbig stars them-
selves if they still have primordial magnetic fields or can sustain magnetic activity via a nonsolar dynamo. We
present new X-ray observations of the nearby Herbig Ae star HD 104237 (=DX Cha) with XMM-Newton, whose
objective is to clarify the origin of the emission. Several X-ray emission lines are clearly visible in the CCD

  

Source: Audard, Marc - INTEGRAL Science Data Centre & Observatory of Geneva, Université de Genève

 

Collections: Physics