Non-axisymmetric Be star circumstellar disks.

Details Non-axisymmetric Be star circumstellar disks. Non-axisymmetric Be star circumstellar disks.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..751h&link_type=abstract

Astronomy and Astrophysics, v.302, p.751

Astronomy and Astrophysics

Astrophysics

26

Lines: Formation, Lines: Profile, Stars: Be, Stars: Circumstellar Matter

Scientific paper

A new high resolution and high signal-to-noise ratio spectroscopic study of Hα, FeII λ5317 and HeI λ5876 emission lines of northern and equatorial Be stars is presented. The line profiles are analyzed in order to test predictions of the recently proposed model of global disk oscillations. The FeII and HeI line profiles are used to derive the kinematics and the radial extension of the circumstellar disk-like plasma. Based on line profile derivatives, we present a new method, the separation of the inflection points (SIP), to resolve the convolved peaks of Hα winebottle-type profiles. The newly derived peak positions are used to determine Hα emission disk radii and mean optical line depths along the line of sight. We find that these improved Hα disk radii are smaller and closer to FeII disk radii than those Hα disk radii derived from pure peak separations. We find evidence that class 2 profiles originate from quasi-Keplerian disks with a non-axisymmetric density distribution.

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