Other
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...74..595y&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 74, Oct. 1990, p. 595-608. Research supported by NSERC.
Other
23
B Stars, Shell Stars, Stellar Oscillations, Stellar Spectra, Line Spectra, Spectral Line Width, Stellar Rotation, Taurus Constellation
Scientific paper
Subfeatures at about 0.5 percent of the continuum move from blue to red through the line profiles of the Be/shell star Zeta Tau. They resemble subfeatures observed in other stars thought to be nonradial pulsators and their average spacing (0.095d) and acceleration (1550 km/s per d) are consistent with m = 14 + or - 2. The linewidths vary with a period (0.683d) which is consistent with an l = 2 mode. After removal of ellipsoidal-like variations from the linewidths, a period (0.1097d) which is similar to the average subfeature spacing is also detected. A formulation which corrects for the effects of pulsation on the observed subfeature motion has been derived and used to estimate a consistent stellar radius (9.7 solar radii) and rotation period (1.39d). The shell components of H-beta and H-gamma also show signs of small-amplitude (about 0.5 percent of the continuum) rapid (of the order of a few hours) line-strength variations.
Harmanec Petr
Hill Grant Michael
Walker Gordon A. H.
Yang Sheng
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