PG 1613+426: a new sdB pulsator

Details PG 1613+426: a new sdB pulsator PG 1613+426: a new sdB pulsator

2002-12-06

arxiv.org/abs/astro-ph/0212165v1

Astron.Astrophys. 398 (2003) 283-286

Astronomy and Astrophysics

Astrophysics

3 pages, 4 figures. to appear on A&A

Scientific paper

10.1051/0004-6361:20021664

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

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