Simultaneous uvby photometry of the new δ Sct-type variable HD 205

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

Corresponding author: E. Rodríguez, eloy@iaa.es

Received: 10 July 2002
Accepted: 18 November 2002

Abstract

The star HD 205 has been discovered to be a new δ Sct-type pulsator through simultaneous uvby photometric observations carried out during the autumn of 2001. A few H-Crawford measurements were also collected. The calibration of the Strömgren photometric indices places this star in the middle part of the δ 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 δ Sct variables.