Evidence for one-armed oscillations in the equatorial disk of zeta Tauri from GI2T spectrally resolved interferometry

Details Evidence for one-armed oscillations in the equatorial disk of zeta Tauri from GI2T spectrally resolved interferometry Evidence for one-armed oscillations in the equatorial disk of zeta Tauri from GI2T spectrally resolved interferometry

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335..261v&link_type=abstract

Astronomy and Astrophysics, v.335, p.261-265 (1998)

Astronomy and Astrophysics

Astrophysics

66

Stars: Circumstellar Matter, Stars: Emission-Line, Be, Stars: Imaging, Stars: Individual: Zeta Tauri, Line: Profiles

Scientific paper

We report sub-mas observations of the Be Shell star zeta Tauri with the Grand Interferometre a2 Telescopes (GI2T) on November '93 and October '94. In '93, the Hα line presented a V/R ratio of 0.57 with a central absorption shell component. On October '94 the Hα line presented a reversed V/R ratio of 1.26 with a shallower absorption component. For both epochs we analysed the amplitude and phase of the fringe signal relative to the local continuum as a function of Doppler-shift across Hα . We clearly resolve the Hα emitting envelope on October '93. We find that the bulge of the emission which occurs around RV=+130 km.s(-1) has a N-S projected position of 0.7 mas to the South of the continuum source. This value corresponds to a linear separation of 3.6 photospheric radii. For October 94, the same analysis shows that the projected position of this bulge, occuring around RV=-70 km.s(-1) has moved to 0.5 mas, i.e. 2.6 photospheric radii, North of the continuum source. On account of the opposite V/R values between 93 and 94 and the long term Hα cyclic variability of zeta Tauri this apparent motion corresponds to the first interferometric detection of an axi-asymmetric envelope around a Be star that we interpret as direct evidence for a prograde one-armed oscillation of its equatorial disk.

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