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The origin of hydrogen line emission for five Herbig Ae/Be stars spatially resolved by VLTI/AMBER spectro-interferometry

Kraus, S., Hofmann, K.H., Benisty, M., Berger, J.P., Chesneau, O., Isella, A., Malbet, F., Meilland, A., Nardetto, N., Natta, A., and others. (2008) The origin of hydrogen line emission for five Herbig Ae/Be stars spatially resolved by VLTI/AMBER spectro-interferometry. Astronomy and Astrophysics, 489 (3). pp. 1157-1173. ISSN 0004-6361. (doi:10.1051/0004-6361:200809946) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:14709)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1051/0004-6361:200809946

Abstract

Context. Accretion and outflow processes are of fundamental importance for our understanding of the formation of stars and planetary systems. To trace these processes, diagnostic spectral lines such as the Br gamma 2.166 mu m line are widely used, although due to a lack of spatial resolution, the origin of the line emission is still unclear.

Conclusions. By performing the first high-resolution spectro-interferometric survey on Herbig Ae/Be stars, we find evidence for at least two distinct Br. line-formation mechanisms. Most significant, stars with a P-Cygni Ha line profile and a high mass-accretion rate seem to show particularly compact Br gamma-emitting regions (R-Br gamma/R-cont < 0.2), while stars with a double-peaked or single-peaked H alpha-line profile show a significantly more extended Br gamma-emitting region (0.6 less than or similar to R-Br gamma/R-cont less than or similar to 1.4), possibly tracing a stellar wind or a disk wind.

Item Type: Article
DOI/Identification number: 10.1051/0004-6361:200809946
Uncontrolled keywords: stars : pre-main sequence; stars : winds, outflows; planetary systems : protoplanetary disks; line : formation; accretion, accretion disks; techniques : interferometric
Subjects: Q Science > QB Astronomy
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Louise Dorman
Date Deposited: 18 Apr 2009 10:44 UTC
Last Modified: 25 Jan 2020 04:02 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/14709 (The current URI for this page, for reference purposes)
Smith, Michael D.: https://orcid.org/0000-0002-4289-5952
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