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Title:
Contribution a l'etude de la binarite des etoiles de type Am. I. HD 125273, binaire spectroscopique a raies doubles
Authors:
Ginestet, N.; Carquillat, J.-M.
Affiliation:
AA(Laboratoire d'Astrophysique (UMR 5572), Observatoire Midi-Pyrenees, 14 avenue Edouard Belin, 31400 Toulouse, France ), AB(Laboratoire d'Astrophysique (UMR 5572), Observatoire Midi-Pyrenees, 14 avenue Edouard Belin, 31400 Toulouse, France )
Publication:
Astronomy and Astrophysics Supplement, v.130, p.415-419 (A&AS Homepage)
Publication Date:
06/1998
Origin:
A&AS
DOI:
10.1051/aas:1998421
Bibliographic Code:
1998A&AS..130..415G

Abstract

We present an observing program undertaken at Observatoire de Haute-Provence, for the search and study of spectroscopic binaries among Am stars. HD 125273 was recognized as an Am star some time ago \cite[(Olsen 1980;]{ols80} \cite[Abt 1984);]{abt84} observations, carried out with the CORAVEL spectrovelocimeter, show that this star is a double-lined spectroscopic binary; its orbital elements are as follows: P = 7.482664 days; T = 2448665.660 JD; omega_1 = 355.3() deg; e = 0.071; K_1 = 49.82 km/s; K_2 = 51.75 km/s; V_0 = -17.42 km/s; a_1 sini = 5.113 Gm; a_2 sini = 5.311 Gm; M_1 sin(3i) = 0.412 M_sun;; M_2 sin(3i) = 0.396 M_sun. Stroemgren photometry of the star \cite[(Olsen 1983)]{ols83} permits us to estimate the following mean physical parameters for the components of the binary: T_eff = 7500 K; log g = 3.70; M_v = 1.24; M = 2.1 M_sun;; R = 3.2 R_sun, and to specify the evolutionary status of the system. Assuming the above mass for the components, we found i ~ 35() deg and a ~ 26 R_sun. This system is thus a detached one without possibility of eclipses. It is likely that the two components are Am stars of very close characteristics. The v sini values, determined from the correlation dips given by CORAVEL, are near 11 km/s for both components. We retain for this binary the hypothesis of rotation-revolution synchronism, because it leads to a value of the radius of the stars in agreement both with the above value and the results of a previous study by \cite[Kitamura & Kondo (1978)]{kit78} of similar, but eclipsing, systems. The ratio of the correlation dip areas indicates a magnitude difference Delta m_v ~ 0.2 mag. As expected in detached systems of main sequence stars, such as Am's, HD 125273 obeys the mass-luminosity law. Etude effectuee a partir d'observations faites a l'Observatoire de Haute-Provence.

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