SIMBAD references

1994A&A...292..152Z - Astronomy and Astrophysics, volume 292, 152-164 (1994/12-1)

X-ray emission from Herbig Ae/Be stars: a ROSAT survey.


Abstract (from CDS):

We have observed 14 Herbig Ae/Be stars in X-rays with the ROSAT PSPC (0.1-2.4keV). In addition, we obtained data from the ROSAT archive for 7 Herbig Ae/Be stars. As a result, 11 of the 21 Herbig Ae/Be stars studied here have been detected as X-ray sources, among them AB Aur, HR 5999/6000, and Z CMa. This is surprising, since Ae/Be stars, being predominantly radiative, are unlikely to sustain dynamo magnetic fields and coronal heating. We have investigated possible correlations between the X-ray luminosity and other stellar parameters like Lbol, spectral type, stellar rotation and winds. We suspect that the origin of the X-ray emission is likely to be related to the stellar wind, although other explanations (e.g. unresolved T Tauri companions) are also discussed. Some Ae/Be stars are known to be the exciting sources of high-velocity jets, but none of the jets themselves were detected in X-rays. In several cases, the X-ray images revealed a small cluster of sources, presumably lower mass pre-main-sequence objects that surround the more massive Ae/Be stars.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: emission-line - stars: stellar coronae - stars: pre-main-sequence

Simbad objects: 23

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