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Issue A&A
Volume 399, Number 1, February III 2003
Page(s) 253 - 262
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20021749



A&A 399, 253-262 (2003)
DOI: 10.1051/0004-6361:20021749

Simultaneous uvby photometry of the new $\delta$ Sct-type variable HD 205

E. Rodríguez1, V. Costa1, G. Handler2, 3 and J. M. García4

1  Instituto de Astrofísica de Andalucía, CSIC, PO Box 3004, 18080 Granada, Spain
2  South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa
3  Astronomisches Institut der Universität Wien, Tünkenschanzstr. 17, 1180 Wien, Austria
4  Departamento de Física, E.U.I.T. Industriales, UPM, Ronda de Valencia 3, 28012 Madrid, Spain

(Received 10 July 2002 / Accepted 18 November 2002)

Abstract
The star HD 205 has been discovered to be a new $\delta$ Sct-type pulsator through simultaneous uvby photometric observations carried out during the autumn of 2001. A few H $_{\beta}$-Crawford measurements were also collected. The calibration of the Strömgren photometric indices places this star in the middle part of the $\delta$ Sct instability strip. The behaviour of the light curves is shown to be very complex with a lot of frequencies necessary to fit the data. The data in the bands v, b and y were analyzed separately to confirm detected pulsations and then combined using a weighting scheme to maximize the signal-to-noise ratio. Nine frequencies were detected with the present data, but several more are probably present. The majority of the detected frequencies are due to nonradial low order p-modes as is commonl in $\delta$ Sct variables.


Key words: stars: variables: $\delta$ Scu -- stars: individual: HD 205 -- stars: oscillations -- techniques: photometric

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

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© ESO 2003


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