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Astron. Astrophys. 363, 1019-1025 (2000)


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Spectral, photometric and speckle observations of visual binary WDS 00550+2338

V.S. Tamazian 1, J.A. Docobo 1, N.D. Melikian 2,3, N. Baba 4 and V.H. Chavushyan 5

1 Astronomical Observatory "Ramon Maria Aller", P.O. Box 197, 15706 Santiago de Compostela, Spain (oatamaz@usc.es; oadoco@usc.es)
2 Byurakan Astrophysical Observatory, reg. Aragatsotn, 378433, Armenia (nmelikia@bao.sci.am)
3 Isaac Newton Institute of Chile, Armenian Branch
4 Hokkaido University, Department of Applied Physics, Sapporo 060-8628, Japan (nbaba@eng.hokudai.ac.jp)
5 Instituto Nacional de Astrofisica, Optica y Electronica, Apartado Postal 51 y 216, C.P. 72000, Puebla, Pue., Mexico (vahram@inaoep.mx)

Received 18 May 2000 / Accepted 10 July 2000

Abstract

New spectral classification, photometric and speckle measurements of visual binary star WDS 00550+2338 are presented. The composite spectrum confirms it belongs to the late type subgiants (K0 IV) and is located above the main sequence. Speckle spectroscopy data allowed us to classify A and B components separately as G8 IV and K3 IV. A brightness increase of [FORMULA] and [FORMULA] in B and V colors, respectively, has been detected during 27 hours of BV photometric observations in the course of two observing runs in 1997 and 1999. New astrometric data are presented confirming the good quality of the last published orbit for this star. On the basis of its orbital data and parallax the total mass of the system, close to 2[FORMULA], is derived. It is suggested that registered variability looks similar to flare-like events usually observed in young pre-main sequence stars, while further photometric observations are needed to confirm the character of variation. No significant polarization signal has been detected for this star.

Key words: stars: binaries: visual – stars: individual: WDS 00550+2338 – stars: variables: general

Send offprint requests to: V.S. Tamazian

© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000

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