On the difference between Herbig Ae and Herbig Be stars

Details On the difference between Herbig Ae and Herbig Be stars On the difference between Herbig Ae and Herbig Be stars

2007-03-07

arxiv.org/abs/astro-ph/0703143v2

Mon.Not.Roy.Astron.Soc.377:1363,2007; Mon.Not.Roy.Astron.Soc.377:1363-1374,2007

Astronomy and Astrophysics

Astrophysics

14 pages, 5 figures. Accepted to MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11699.x

We present linear spectropolarimetric data for eight Herbig Be and four Herbig Ae stars at H alpha, H beta and H gamma. Changes in the linear polarisation are detected across all Balmer lines for a large fraction of the observed objects, confirming that the small-scale regions surrounding these objects are flattened (i.e. disk-like). Furthermore, all objects with detections show similar characteristics at the three spectral lines, despite differences in transition probability and optical depth going from H alpha to H gamma. A large fraction of early Herbig Be stars (B0-B3) observed show line depolarisation effects. However the early Herbig Ae stars (A0-A2), observed for comparison, show intrinsic line polarisation signatures. Our data suggest that the popular magnetic accretion scenario for T Tauri objects may be extended to Herbig Ae stars, but that it may not be extended to early Herbig Be stars, for which the available data are consistent with disc accretion.

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