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Astron. Astrophys. 324, 965-976 (1997)

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Properties and nature of Be stars

17. V360 Lac = HD 216200 is a B3e + F9IV: binary *

G. Hill 1, P. Harmanec 2, K. Pavlovski 3, H. Bo i 3, P. Hadrava 2, P. Koubský 2 and J. i ovský 4

1 Dominion Astrophysical Observatory, 5071 W. Saanich Road, Victoria, B.C., V8X 3X3 Canada (gph@phy.auckland.ac.nz)
2 Astronomical Institute, Academy of Sciences of the Czech Republic, 251 65 Ond ejov, Czech Republic (hec(had,koubsky)@sunstel.asu.cas.cz)
3 Hvar Observatory, Faculty of Geodesy, Zagreb University, Ka ieva 26, 10000 Zagreb, Croatia (kresimir@geodet.grad.hr, hrvoje.bozic@x400.srce.hr)
4 Astronomical Institute, Slovak Academy of Sciences, Stará Lesná, 059 60 Tatranská Lomnica, Slovakia (ziga@ta3.sk)

Received 26 December 1996 / Accepted 6 March 1997

Abstract

An analysis of an extensive collection of photometric and spectroscopic observations of the little studied bright Be star V360 Lac lead to the following main conclusions:

(1) V360 Lac is a binary system consisting of a B3e primary and a F9IV secondary which probably fills the Roche lobe and losses mass towards the primary. Radial-velocity curves of both components were obtained.

(2) The light variations arise from superposition of variations on at least three time scales: phase-locked orbital brightness and colour changes with two minima; sinusoidal variation with a 322 [FORMULA] 24 period and low-amplitude rapid changes with a possible period of 1 [FORMULA] 6738.

(3) A tentative solution of the B and V light curves which assumes the semi-detached configuration and presence of a disk around the primary, combined with the orbital solution, leads to preliminary basic physical elements of the system which are consistent with the radiative properties of the binary components.

Key words: stars: Be – stars: binaries: spectroscopic – stars: binaries: eclipsing – stars: fundamental parameters – stars: individual: V360 Lac

* Table 4 is only available in electronic form via anonymus ftp 130.79.128.5 or http://cdsweb.u-strasbg.fr/Abstract.html

Present address: Department of Physics, University of Auckland, 38 Princess St., Auckland, New Zealand

Send offprint requests to: G. Hill

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© European Southern Observatory (ESO) 1997

Online publication: May 5, 1998

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