E. Kambe et al., LINE-PROFILE VARIATIONS OF LAMBDA-ERIDANI IN EMISSION AND QUIESCENCE, Publications of the Astronomical Society of the Pacific, 105(693), 1993, pp. 1222-1231
Citations number
38
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Publications of the Astronomical Society of the Pacific
The line-profile variations (lpv) of He I lambda6678 in the Be star La
mbda Eridani were studied from 1987 to 1992, which covered three quies
cent and three emission epochs. The lpv cover a range of +/-480 km s-1
during emission but are limited to +/-380 km s-1 during quiescence. T
he extension of lpv to higher velocities during emission phases and th
e detection of identical periods of 17 and 8.5 hr (or their aliases) i
n both quiescence and emission-possibly even in the extreme blue wing
of the line during emission-are consistent with the existence of nonra
dial 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.