Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-23
Astrophys.J. 614 (2004) 221-234
Astronomy and Astrophysics
Astrophysics
To appear in ApJ (part 1); 43 pages, 8 figures, 5 tables
Scientific paper
10.1086/422708
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 spectra, including the high-temperature Fe K-alpha complex. The emission can be accurately modeled as a multi-temperature thermal plasma with cool (kT < 1 keV) and hot (kT > 3 keV) components. The presence of a hot component is compelling evidence that the X-rays originate in magnetically confined plasma, either in the Herbig star itself or in the corona of an as yet unseen late-type companion. The X-ray temperatures and luminosity (log Lx = 30.5 ergs/s) are within the range expected for a T Tauri companion, but high resolution Chandra and HST images constrain the separation of a putative companion to less than 1 arcsec. We place these new results into broader context by comparing the X-ray and bolometric luminosities of a sample of nearby Herbig stars with those of T Tauri stars and classical main-sequence Be stars. We also test the predictions of a model that attributes the X-ray emission of Herbig stars to magnetic activity that is sustained by a shear-powered dynamo.
Audard Marc
Guedel Manuel
Skinner Sam
Smith Kester
No associations
LandOfFree
New Perspectives on the X-ray Emission of HD 104237 and Other Nearby Herbig Ae/Be Stars from XMM-Newton and Chandra does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New Perspectives on the X-ray Emission of HD 104237 and Other Nearby Herbig Ae/Be Stars from XMM-Newton and Chandra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New Perspectives on the X-ray Emission of HD 104237 and Other Nearby Herbig Ae/Be Stars from XMM-Newton and Chandra will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-711876