Is the Be star HR 9070 actually pulsating?

Details Is the Be star HR 9070 actually pulsating? Is the Be star HR 9070 actually pulsating?

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..159s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 159-167. CNRS-CONACYT-supported research.

Astronomy and Astrophysics

Astrophysics

8

Astronomical Photometry, B Stars, Light Curve, Stellar Oscillations, Variable Stars, H Alpha Line, Radial Velocity, Root-Mean-Square Errors

Scientific paper

New photometric observations on the short period Be variable HR 9070 have been obtained by a cooperation program between Europe and Mexico in 1983 - 84 - 85. Analysing the authors' data - as well as all available data - by a 0.3 day period or by a double wave 0.6 day period curve brings about the same rms error. Spectrography suggests large RV discontinuities in the components of Hα, superimposed on smooth variations possibly correlated with the shortest period. Depending on the actual solution, pulsation or rotation may be invoked. The shortest periodic Be stars show periods longer than the classical β CMa pulsating variables, so unusual pulsation modes should be considered. Or, if rotation of a star with spots on its surface accounts for the variations, an exclusion mechanism between β CMa and Be phenomena must exist, probably as a function of rotation-line broadening.

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