0000000000318978

AUTHOR

J. H. M. M. Schmitt

showing 2 related works from this author

X-rays from accretion shocks in T Tauri stars: The case of BP Tau

2005

We present an XMM-Newton observation of the classical T Tauri star BP Tau. In the XMM-Newton RGS spectrum the O {\sc vii} triplet is clearly detected with a very weak forbidden line indicating high plasma densities and/or a high UV flux environment. At the same time concurrent UV data point to a small hot spot filling factor suggesting an accretion funnel shock as the site of the X-ray and UV emission. Together with the X-ray data on TW Hya these new observations suggest such funnels to be a general feature in classical T Tauri stars.

Physicsbusiness.product_categoryFilling factorAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAccretion (astrophysics)T Tauri starSpace and Planetary ScienceHigh plasmaAstrophysics::Solar and Stellar AstrophysicsFunnelAstrophysics::Earth and Planetary AstrophysicsForbidden mechanismbusinessAstrophysics::Galaxy Astrophysics
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On the origin of the X-ray emission from Herbig Ae/Be stars

2006

We performed a systematic search for Chandra archival observations of Herbig Ae/Be stars. These stars are fully radiative and not expected to support dynamo action analogous to their convective lower-mass counterparts, the T Tauri stars. Their X-ray emission has remained unexplained. The superior spatial resolution of Chandra with respect to previous X-ray instrumentation has allowed us to examine the possible role of late-type companions in generating the observed X-rays. In the total sample of 17 Herbig Ae/Be stars, 8 are resolved from X-ray emitting faint companions or other unrelated X-ray bright objects within 10". The detection fraction of Herbig Ae/Be stars is 76 %, but lowers to 35 …

PhysicsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)X-rayFOS: Physical sciencesAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsLarge rangeAstrophysicsStarsT Tauri starSpace and Planetary ScienceRadiative transferAstrophysics::Solar and Stellar AstrophysicsSpectral analysisAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsDynamoSystematic searchAstronomy & Astrophysics
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