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EUVE J0825-16.3 and EUVE J1501-43.6: Two dMe Double–Lined Spectroscopic Binaries

Published online by Cambridge University Press:  09 August 2007

D. Montes ,
I. Crespo-Chacón ,
M.C. Gálvez  and
M.J. Fernández-Figueroa
D. Montes
Affiliation:
Departamento de Astrofísica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Spain email: dmg@astrax.fis.ucm.es
I. Crespo-Chacón
Affiliation:
Departamento de Astrofísica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Spain email: dmg@astrax.fis.ucm.es
M.C. Gálvez
Affiliation:
Departamento de Astrofísica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Spain email: dmg@astrax.fis.ucm.es Astronomy Department, University of Florida, Bryant Space Science Center, Gainesville, Florida, USA
M.J. Fernández-Figueroa
Affiliation:
Departamento de Astrofísica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Spain email: dmg@astrax.fis.ucm.es
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Abstract

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High-resolution echelle spectroscopic observations taken with the FEROS spectrograph at the ESO 2.2-m telescope confirm the binary nature of the dMe stars EUVE J0825−16.3 and EUVE J1501−43.6, previously reported by Christian & Mathioudakis (2002). In these binary systems, emission of similar intensity from both components is detected in the Na i D1 & D2, He i D3, Ca II H&K, Ca II IRT and Balmer lines. We have determined precise radial velocities by cross-correlation with radial velocity standard stars, which have allowed us to obtain for the first time the orbital solution of these systems. Both binaries consist of two nearly equal M0V components with an orbital period shorter than 3.5 days. We have analyzed the behaviour of the chromospheric activity indicators (variability and possible flares). In addition, we have determined its rotational velocity and kinematics.

Keywords

stars: binaries: spectroscopicstars: activitystars: atmospheresstars: chromospheresstars: flarestars: late-typestars: fundamental parameters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 690 - 696
Copyright
Copyright © International Astronomical Union 2007

References

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Lampton, M., Lieu, R., Schmitt, J.H.M.M., Bowyer, S., Voges, W., Lewis, J., & Wu, X. 1997, ApJS, 108, 545 CrossRefGoogle Scholar
Montes, D., Gálvez, M.C., Fernández-Figueroa, M.J., & Crespo-Chacón, I. 2006, ApSS, 41 Google Scholar