Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21430104h&link_type=abstract
American Astronomical Society, AAS Meeting #214, #301.04; Bulletin of the American Astronomical Society, Vol. 41, p.714
Astronomy and Astrophysics
Astronomy
Scientific paper
Double-peaked hydrogen emission line profiles in classical Be stars can be significantly asymmetric, and these asymmetries can vary in a quasi-periodic manner with periods of several years. This has been interpreted as evidence of one-armed density waves in the circumstellar disks surrounding these stars. The density structure of these disks can be explored as a function of radius by observing contemporaneously the profile shapes of the hydrogen lines appearing in the optical and near infrared. Observations of 33 bright Be stars monitored in the optical at Ritter Observatory and in the near-IR using the NASA IRTF with SpeX between September 2005 and January 2008 are presented. A range of common Be star line profile shapes are represented, including some stars whose asymmetric profiles are known to vary quasi-periodically. Correlations between optical and IR hydrogen lines will be discussed and implications for one-armed density wave models will be considered.
We thank the NASA IRTF for observing time allocations and support. We thank the Ritter observing team, and especially Nancy Morrison, for crucial assistance with the supporting optical observations.
Bjorkman Karen S.
Hesselbach Erica
Kowalski Adam F.
Wisniewski John P.
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