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Astron. Astrophys. Suppl. Ser.
Volume 127, Number 3, February I 1998
Page(s) 433 - 444
Published online 15 February 1998
DOI: 10.1051/aas:1998112

A&A Supplement series, Vol. 127, February I 1998, 433-444

Received November 6, 1996; accepted June 5, 1997

14 Lacertae: A case of shell-orbit coupling?gif

M. Bossitex2html_wrap496, N.S. Nuñeztex2html_wrap498, G. Guerrerotex2html_wrap496, J.-P. Sareyantex2html_wrap502, and M. Alvareztex2html_wrap504

Send offprint request: M. Bossi. Internet:

tex2html_wrap506  Osservatorio Astronomico di Brera, Via Bianchi 46, I-22055 Merate LC, Italy
tex2html_wrap508  Observatorio Astronómico P. Buenaventura Suarez, C.C. 1129, Asunción, Paraguay
tex2html_wrap510  Observatoire de la Côte d'Azur, BP. 139, F-06003 Nice Cedex, France
tex2html_wrap512  Observatorio Astronómico Nacional, UNAM, Apdo. 877, Ensenada, B.C. 22800, Mexico


We present new photometric and spectroscopic observations of this peculiar Be star: respectively 516 tex2html_wrap_inline486 values in 16 nights and 50 spectrograms in 4 nights in the Htex2html_wrap_inline488 region. A feature of the HeItex2html_wrap_inline490 line profile seems to indicate the presence of a double-lined binary spectrum. Nevertheless, an analysis of our and other available data (former published and unpublished photometry) leads us to rule out the current interpretations of the double-wave light curve shown by this star: 14 Lac can neither be identified as an ellipsoidal variable nor as an eclipsing binary. Its variability is likely to be produced in the circumstellar region by a shell distortion due to the presence of the companion star, even if there is not enough evidence to exclude other hypotheses. The implications both of the duplicity assumption and of its possible refutation are discussed.

keywords: stars: emission-line, Be -- general; spectroscopie (stars:) binaries: -- stars: individual: 14 Lac

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