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Astron. Astrophys. 354, L13-L16 (2000)

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Letter to the Editor

A pulsation episode from the sdB star PG 0856+121

A. Piccioni 1, C. Bartolini 1, S. Bernabei 1, I. Bruni 1, S. Galleti 1, F. Giovannelli 2, A. Guarnieri 1, L. Sabau-Graziati 3, R. Silvotti 4, A. Ulla 5 and G. Valentini 6

1 Università di Bologna, Dipartimento di Astronomia, Italy
2 Istituto di Astrofisica Spaziale, CNR, Area di Ricerca di Tor Vergata, Roma, Italy
3 División de Ciencias del Espacio, INTA, Madrid, Spain
4 Osservatorio Astronomico di Capodimonte, Napoli, Italy
5 Universidade de Vigo, Departamento de Física Aplicada, Spain
6 Osservatorio Astronomico di Collurania, Teramo, Italy

Received 29 September 1999 / Accepted 12 January 2000


Within the framework of a large campaign of observations of hot subdwarf stars, periodic light variations at 2.3 mHz and 3.2 mHz have been detected in the B hot subdwarf star PG 0856+121 at a [FORMULA] confidence level. Their amplitudes are of 3.0 and 3.5 mmag, respectively.

Key words: stars: variables: general – stars: subdwarfs – stars: oscillations – stars: individual: PG0856+121 – techniques: photometric

Send offprint requests to: piccioni@ermione.bo.astro.it

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© European Southern Observatory (ESO) 2000

Online publication: January 31, 2000