EDP Sciences
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Volume 398, Number 1, January IV 2003
Page(s) 283 - 285
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20021664

A&A 398, 283-285 (2003)
DOI: 10.1051/0004-6361:20021664

PG 1613+426: A new sdB pulsator

A. Bonanno1, S. Catalano1, A. Frasca1, G. Mignemi2 and L. Paternò2

1  INAF - Osservatorio Astrofisico di Catania, Città Universitaria, 95123 Catania, Italy
2  Dipartimento di Fisica e Astronomia dell'Università, Sezione Astrofisica, Città Universitaria, 95123 Catania, Italy

(Received 22 October 2002 / Accepted 12 November 2002 )

We report the detection of short period oscillations in the hot subdwarf B (sdB) star PG 1613+426 from time-series photometry carried out with the 91-cm Cassegrain telescope of the Catania Astrophysical Observatory. This star, which is brighter than the average of the presently known sdB pulsators, with B = 14.14 mag, has $T_{\rm eff}=34\,400~{\rm K}$ and $\log g = 5.97$, its position is near the hot end of the sdB instability strip, and it is a pulsator with a well observed peak in the power spectrum at $144.18\pm 0.06\,\rm s$. This star seems to be well suited for high precision measurements, which could detect a possible multi-mode pulsation behaviour.

Key words: stars: subdwarfs -- stars: oscillations -- stars: individual: PG 1613+426

Offprint request: A. Bonanno, abo@ct.astro.it

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