Detection of rapid V/R variations in the BE star EW Lacertae

Details Detection of rapid V/R variations in the BE star EW Lacertae Detection of rapid V/R variations in the BE star EW Lacertae

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228..361p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. 361-364.

Astronomy and Astrophysics

Astrophysics

5

B Stars, H Gamma Line, Shell Stars, Stellar Radiation, Variable Stars, Balmer Series, Periodic Variations, Stellar Spectra

Scientific paper

The detection is reported of possible rapid periodic variations in the V/R ratio in the double-peaked emission of H-gamma for the Be and shell star EW Lac (HD 217050). The analysis is based on the high-resolution CCD spectra with high S/N ratio. A time-series analysis with application of the CLEAN algorithm to remove aliases from periodogram yields a period of about 0.7 d. The same period was previously identified in light variations. These findings are examined in the frameworks of a non-radial pulsation and rotating asymmetric envelope hypothesis.

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