A&A 407, 1059-1065 (2003)
DOI: 10.1051/0004-6361:20030925

 Sct-type nature of the variable V2109 Cyg

E. Rodríguez¹, A. Arellano Ferro², V. Costa¹, M. J. López-González¹ and J. P. Sareyan<sup>3

1</sup>  Instituto de Astrofísica de Andalucía, CSIC, PO Box 3004, 18080 Granada, Spain
²  Instituto de Astronomía, UNAM, PO Box 70-264, 4510 Mexico DF, Mexico
³  Observatoire de la Côte d'Azur, BP 4229, 0634 Nice Cedex 4, France

(Received 12 February 2003 / Accepted 12 June 2003)

Abstract
We present the results of simultaneous photometry carried out from 1999 to 2001 of the variable V2109 Cyg together with a spectroscopic analysis based on one high resolution spectrum obtained in 2000. From this study, the star is definitively classified as an evolved  Sct-type variable with solar metal abundances. This conclusion is also supported by the detected multiperiodic pulsational behaviour and the observed variation of the  m₁ index over the pulsation cycle. This variation is slightly reversed relative to the  V light curve, in very good agreement with the  m₁ variation expected from the photometric calibrations. Besides the main frequency f₁=5.3745 cd ^-1 and its first harmonic  2f₁, a secondary peak is found at f₂=5.8332 cd ^-1 ( f₁/f₂=0.92) with  f₁ identified as a radial mode and  f₂ as non-radial. Whereas no significant variations are found in the amplitude of  f₁ from season to season, the amplitude of  f₂ changes strongly. Moreover, the main period has remained constant since 1990, within the observational uncertainties. Additional secondary frequencies may also be excited in this variable.

Key words: stars: variables:  Sct -- stars: individual: V2109 Cyg -- stars: oscillations -- techniques: photometric, spectroscopic

Offprint request: E. Rodríguez, eloy@iaa.es

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