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HR 8762: Low-amplitude Photometric Variation in a Pre-shell Phase

Published online by Cambridge University Press:  15 February 2018

S. Gonzàlez-Bedolla
Affiliation:
Instituto de Astronomiá, UNAM, Apdo. Postal 70-264, México, D.F. México
J. P. Sareyan
Affiliation:
Observatoire de la Côte d'Azure, B.P. 139, F-06003, Nice Cedex, France
J. Chauville
Affiliation:
Observatoire de Meudon, F-92195, Meudon Cedex, France
P. J. Morel
Affiliation:
Observatoire de la Côte d'Azure, B.P. 139, F-06003, Nice Cedex, France
M. Alvarez
Affiliation:
Instituto de Astronomiá, UNAM, Apdo. Postal 70-264, México, D.F. México

Extract

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Longitude-coordinated high-precision photometry has been obtained a few weeks before the beginning of a strong Be and shell phase (1988) in HR 8762 (o And). The star showed variations of a few millimagnitudes in amplitude; i.e., just over the detection threshold. The classical 1.57-day double-wave period is still detected, showing that it probably never fades out completely, whatever the phase of the star. These variations can be interpreted as normal photospheric activity in a regular rotating B star. Although the variations of HR 8762 during our campaign were quite small, we could detect their amplitudes at a level of a few mmag.

We still have to check whether they are still “in phase” with previous photometric observations: if this is the case, it means that in the “spot” hypothesis, these (superficial?) features would remain in the same position on the photosphere, changing only in surface area and/or brightness with the star's activity.

Type
Beyond the Classical Instability Strip
Copyright
Copyright © Cambridge University Press 1993

References

Guerrero, G., Mantegazza, L., 1979, A&A 36, 471 Google Scholar