Line-profile variations of Lambda Eridani in emission and quiescence

Details Line-profile variations of Lambda Eridani in emission and quiescence Line-profile variations of Lambda Eridani in emission and quiescence

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1222k&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 693, p. 1222-1231

Astronomy and Astrophysics

Astronomy

23

B Stars, Emission Spectra, Helium, Line Spectra, Periodic Variations, Stellar Oscillations, Data Reduction, Spectrum Analysis, Stellar Mass, Stellar Rotation

Scientific paper

The line-profile variations (lpv) of He I lambda 6678 in the Be star Lambda Eridani were studied from 1987 to 1992, which covered three quiescent and three emission epochs. The lpv cover a range of +/- 480 km/s during emission but are limited to +/- 380 km/s during quiescence. The extension of lpv to higher velocities during emission phases and the detection of identical periods of 17 and 8.5 hr (or their aliases) in both quiescence and emission--possibly even in the extreme blue wing of the line during emission--are consistent with the existence of nonradial pulsations (nrp) in an accelerated equatorial region. A period of 17 hr with its first overtone implies that the surface variations are not simply sinusoidal.

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