EDP Sciences
Free access
Volume 390, Number 3, August II 2002
Page(s) 1027 - 1032
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020769

A&A 390, 1027-1032 (2002)
DOI: 10.1051/0004-6361:20020769

Analysis of a $\delta$ Scuti spectroscopic binary: CQ Lyncis

F. Carrier1, Y. Debernardi2, S. Udry1, J.-M. Carquillat3 and N. Ginestet3

1  Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
2  Institut d'Astronomie de l'Université de Lausanne, 1290 Chavannes-des-Bois, Switzerland
3  Observatoire Midi-Pyrénées, Laboratoire d'Astrophysique, 14 Avenue Édouard Belin, 31400 Toulouse, France

(Received 2 April 2002 / Accepted 13 May 2002 )

CQ Lyn is a new double-lined spectroscopic binary, composed of an Am $\delta$ Scuti and a solar-like star, with an orbital period of 12.50736 d and a zero-eccentricity. Physical parameters of both stars are well constrained. The characteristics of the primary are the following: $M=1.714\,M_{\odot}$, $T_{\rm eff}=6760$ K, $\log L/L_{\odot}=1.097$ and $\log g=3.85$ dex. Power spectra of HIPPARCOS photometry and CORAVEL radial velocities show multi-period pulsation behaviour. Three frequencies are identified: f1=8.86725, f2=8.81150 and f3=8.91007 c/d and are assumed to be l=2 f-modes split by rotation, considering their pulsation constants Q1=0.0356, Q2=0.0359 and Q3=0.0355 d. Two combination oscillations are also present in the power spectrum at frequency f1+ f2 and f2+ f3.

Key words: stars: variables: $\delta$ Sct -- stars: binaries: spectroscopic -- stars: individual: CQ Lyn

Offprint request: F. Carrier, Fabien.Carrier@obs.unige.ch

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© ESO 2002