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Astron. Astrophys. 318, L21-L24 (1997)


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Letter to the Editor

HD 111786 : a spectroscopic binary [FORMULA] Boo star *

R. Faraggiana 1, M. Gerbaldi 2 and R. Burnage 3

1 Università degli Studi di Trieste, Dipartimento di Astronomia, v. Tiepolo 11, I-34131 Trieste, Italy (e-mail: faraggiana@oat.ts.astro.it)
2 Centre National de la Recherche Scientifique, Institut d'Astrophysique, 98bis Bd. Arago, F-75014 Paris, France (e-mail: gerbaldi@iap.fr Université de Paris-Sud XI
3 Centre National de la Recherche Scientifique, Observatoire de Haute Provence, F-04180 Saint Michel l'Observatoire, France (e-mail: burnage@obs-hp.fr)

Received 19 November 1996 / Accepted 19 December 1996

Abstract

HD 111786=HR 4881 is one of the most interesting [FORMULA] Boo stars; in fact it is one of the few stars of this class which shows narrow features that can be interpreted as remnants of the circumstellar matter from which star was formed. On the basis of optical observations and inspection of IUE spectra, we demonstrate that HD 111786 is, as a matter of fact, a binary system and that one of the component is characterized by a narrow line spectrum; the main contribution to the narrow absorptions is not that of circumstellar gas related to the [FORMULA] Boo phenomenon, but is due to the photosphere of the companion star.

Key words: stars : individual : HD 111786 - stars : atmospheres - stars : circumstellar matter

* Based on observations collected at the European Southern Observatory (ESO), and on data from the International Ultraviolet Explorer of the European Space Agency.

Send offprint requests to: R.Faraggiana

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998

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