Spectroscopic Diagnostics of Circumstellar Disk Accretion in Herbig Ae/Be Stars

Details Spectroscopic Diagnostics of Circumstellar Disk Accretion in Herbig Ae/Be Stars Spectroscopic Diagnostics of Circumstellar Disk Accretion in Herbig Ae/Be Stars

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.6215g&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #62.15; Bulletin of the American Astronomical Society, Vol. 25, p.905

Astronomy and Astrophysics

Astronomy

Scientific paper

High resolution spectra of 30 Herbig Ae/Be stars are examined for evidence of accretion disk activity. These young, intermediate mass stars (1.5 < M/Msun < 20) have been cast as higher mass analogs of classical T Tauri stars: solar type pre-main sequence stars thought to be surrounded by circumstellar accretion disks. We investigate this analogy by comparing spectral diagnostics attributed to accretion phenomena in the classical T Tauri stars with comparable quantities in the Herbig Ae/Be stars. Spectral types and projected equatorial rotational velocities (vsini) are determined, and standard photospheric stellar templates are subtracted from the Ae/Be stellar spectra. The residual spectra are then used to examine the following accretion diagnostics: (1) the frequency of direct mass inflow signatures as exhibited by inverse P-Cygni line profiles, (2) relations between Balmer and forbidden line emission and infrared color indices, (3) limits on any optical continuum excess, or spectral ``veiling", which, if produced in a hot boundary layer, sets limits on mass accretion rates.

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