Interferometric insight into gamma Cassiopeiae long-term variability

Details Interferometric insight into gamma Cassiopeiae long-term variability Interferometric insight into gamma Cassiopeiae long-term variability

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...345..203b&link_type=abstract

Astronomy and Astrophysics, v.345, p.203-210 (1999)

Astronomy and Astrophysics

Astrophysics

55

Techniques: Interferometric, Stars: Circumstellar Matter, Stars: Emission-Line, Be, Stars: Individual: Gamma Cas, Stars: Winds, Outflows

Scientific paper

We present spectrally resolved interferometry of the Be star gamma Cas in '88, '91, '93 and '94, obtained with the GI2T interferometer. The analysis of high spatial resolution data across the Hα line reveals azimuthally asymmetric variations which are correlated with those of V/R of the Hα profile. This correlation supports a prograde one-armed oscillation precessing in the equatorial disk of gamma Cas due to the confinement by a radiative effect. We examine the occurrence of such oscillations in the context of the latitude dependent radiative wind model developed for previous GI2T interferometric observations of this star. We find that this enhanced equatorial density pattern may be located at 1.5 stellar radii from the stellar surface. We follow its possible rotation through the -99 km s(-1) , +92 km s(-1) , +140 km s(-1) and +41 km s(-1) iso-velocity regions which results in approximate stellar longitudes: 224degr , 42degr , 153,degr and 184degr for '88, '91, '93, '94 epochs respectively. Thus, gamma Cas is the second Be star after zeta Tau for which interferometric observations directly evidence a prograde one-armed oscillations of its equatorial disk.

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