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Title:
HD 173977: An ellipsoidal δ Scuti star variable
Authors:
Chapellier, E.; Mathias, P.; Garrido, R.; Le Contel, J.-M.; Sareyan, J.-P.; Ribas, I.; Parrao, L.; Moya, A.; Peña, J. H.; Alvarez, M.
Affiliation:
AA(Observatoire de la Côte d'Azur, Département GEMINI - UMR 6203, BP 4229, 06304 Nice Cedex 4, France ), AB(Observatoire de la Côte d'Azur, Département GEMINI - UMR 6203, BP 4229, 06304 Nice Cedex 4, France ), AC(Instituto de Astrofisica de Andalucia, Apt. 3004, 18080 Granada, Spain), AD(Observatoire de la Côte d'Azur, Département GEMINI - UMR 6203, BP 4229, 06304 Nice Cedex 4, France), AE(Observatoire de la Côte d'Azur, Département GEMINI - UMR 6203, BP 4229, 06304 Nice Cedex 4, France), AF(Departamento de Astronomia y Meteorologia, Universitat de Barcelona, 08028 Barcelona, Spain), AG(Instituto de Astronomia de la UNAM, Ap. P. 877, Ensenada, BC, Mexico), AH(Instituto de Astrofisica de Andalucia, Apt. 3004, 18080 Granada, Spain), AI(Instituto de Astronomia de la UNAM, Ap. P. 877, Ensenada, BC, Mexico), AJ(Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Apdo. Postal 70-264, Mexico DF 04510, Mexico)
Publication:
Astronomy and Astrophysics, v.426, p.247-252 (2004) (A&A Homepage)
Publication Date:
10/2004
Origin:
A&A
Astronomy Keywords:
stars: binaries: general, stars: oscillations, techniques: photometric, techniques: spectroscopic, stars: variables: δ Sct
DOI:
10.1051/0004-6361:20034068
Bibliographic Code:
2004A&A...426..247C

Abstract

We present spectroscopic and photometric observations of the star HD 173977. It appears that the star is part of a double line binary system, with a period of 1.801 d, corresponding to twice the period of the photometric variations. Hence the star is an ellipsoidal variable. The system is probably synchronized. The physical parameters of both components were derived through two independant methods, one based on evolutionary tracks, the other being the result of the behaviour of light curves in a close binary system. After removing the ellipsoidal variations, 3 frequencies are detected in the photometric data: 8.56, 14.51 and 16.42 d-1, while 2 additional frequencies are also possible: 10.96 and 12.11 d-1. In accordance with its position in the HR diagram, the primary component of HD 173977 should be considered as a δ Scuti star and no longer as a γ Doradus star. In addition, HD 173844, used as a check star, is discovered variable with a 15.79 d-1 frequency and is classified as a δ Scuti star.

Based on observations obtained at the Observatoire de Haute-Provence.

Spectroscopic and photometric data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/426/247

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