New δ Scuti variable in the Pleiades: HD 23628

¹ National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
² Observatoire de Paris, LESIA, FRE 2461, 92195 Meudon, France
³ Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
⁴ Instituto de Astronomía-UNAM, Ap.P. 877, Ensenada, BC, Mexico
⁵ National Solar Observatory, Tucson, AZ 85719, USA
⁶ Observatoire Midi-Pyrénées, UMR CNRS, 31400 Toulouse, France
⁷ Observatoire de Paris, GEPI, FRE2459, 92195 Meudon, France
⁸ Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain

Corresponding author: Z.-P. Li, lizhi@bao.ac.cn

Received: 15 June 2001
Accepted: 28 August 2002

Abstract

We report here the discovery of very low amplitude oscillations in the Pleiades star HD 23628. The 14-nights high quality light curve designates HD 23628 as a new member of the δ Scuti stars class. Amplitude spectra indicate a multi-periodic pulsation behaviour, and four pulsation frequencies have been detected so far. The frequency distribution suggests the presence of nonradial modes. Pulsation constant values of the four modes are distributed in the range corresponding to fundamental f to p₄ radial modes.