Analysis of a δ Scuti spectroscopic binary: CQ Lyncis

F. Carrier; Y. Debernardi; S. Udry; J.-M. Carquillat; N. Ginestet

doi:10.1051/0004-6361:20020769

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Volume 390 / No 3 (August II 2002)

A&A, 390 3 (2002) 1027-1032

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Issue		A&A Volume 390, Number 3, August II 2002


Page(s)		1027 - 1032
Section		Interstellar and circumstellar matter
DOI		https://doi.org/10.1051/0004-6361:20020769
Published online		14 August 2002

A&A 390, 1027-1032 (2002)

Analysis of a δ 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

Corresponding author: F. Carrier, Fabien.Carrier@obs.unige.ch

Received: 2 April 2002
Accepted: 13 May 2002

Abstract

CQ Lyn is a new double-lined spectroscopic binary, composed of an Am δ 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: $f_1=8.86725$ , $f_2=8.81150$ and $f_3=8.91007$ c/d and are assumed to be $l=2$ f-modes split by rotation, considering their pulsation constants $Q_1=0.0356$ , $Q_2=0.0359$ and $Q_3=0.0355$ d. Two combination oscillations are also present in the power spectrum at frequency f₁+f₂ and f₂+f₃.

Key words: stars: variables: δ Sct / stars: binaries: spectroscopic / stars: individual: CQ Lyn

^*

Based on observations collected at the 1.93-m and Swiss 1-m telescopes at the Haute-Provence Observatory (OHP, France), at the Belgian 1.2-m telescope at La Palma (ENO, Spain) and on data from the ESA Hipparcos satellite.

© ESO, 2002

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Analysis of a δ Scuti spectroscopic binary: CQ Lyncis*

Analysis of a δ Scuti spectroscopic binary: CQ Lyncis^*