Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 521, Issue 2, Pages 2427-2438Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stad629
Keywords
stars: early-type; variables: T Tauri; Herbig Ae; Be; X-rays: stars
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We reanalyse archival X-ray data of 16 Ae/Be Herbig stars obtained by the XMM-Newton and Chandra satellites. We find that the unabsorbed X-ray luminosity of Herbig stars is dependent on stellar mass and radius, similar to that for T Tauri stars. The accretion rates, rotation periods, and surface magnetic fields of Herbig stars follow a tight correlation predicted by the standard magnetospheric accretion theory. We suggest that X-ray emission from Herbig stars is powered by magnetic reconnection events in the tenuous corona at the disc-magnetosphere boundary.
We reanalyse archival X-ray data of 16 Ae/Be Herbig stars obtained by the XMM-Newton and Chandra satellites. Stellar X-ray spectra in the energy range 0.2-8 keV were fitted with the use of APEC and MEKAL hot plasma emission models, and with models with an additional power-law component. We find that for Herbig stars, the dependence of the unabsorbed X-ray luminosity on stellar mass and radius, L-X proportional to (RM beta)-M-alpha with alpha approximate to 3 and beta approximate to 2, is similar to that for T Tauri stars. The independently determined accretion rates, rotation periods, and the surface magnetic fields follow a tight correlation predicted by the standard magnetospheric accretion theory. We suggest that X-ray emission from Herbig stars is powered by magnetic reconnection events in the tenuous corona at the disc-magnetosphere boundary.
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