Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...511..925g&link_type=abstract
The Astrophysical Journal, Volume 511, Issue 2, pp. 925-931.
Astronomy and Astrophysics
Astronomy
15
Accretion, Accretion Disks, Stars: Circumstellar Matter, Line: Profiles, Stars: Individual (Ab Aurigae), Ultraviolet: Stars
Scientific paper
Surveys of Herbig Ae/Be stars have indicated that infalling, circumstellar gas similar to that routinely detected toward beta Pic is preferentially observed close to the disk midplane. Recent millimeter interferometry of the historically prototypical Herbig Ae star, AB Aur, indicates that this star is viewed slightly above the disk midplane (i=76^deg). The wealth of archival spectroscopic data for this star makes it an ideal test of the geometry for infalling or accreting gas in these stars. We present a review of the extant IUE and Hubble Space Telescope GHRS spectral data for AB Aur and find, in contrast to previous studies of this star, which focused on Mg II, that infalling gas is detected at all epochs with covering factors similar to those reported for HD 100546 and that an episode of enhanced infall was serendipitously detected during the 1990 monitoring run.
Bjorkman Karen S.
Grady Carol A.
Massa Derck
Perez Mario R.
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