PG 1613+426: a new sdB pulsator

Abstract

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 $T_{\mathrm{eff}}=34400\mathrm{K}$ 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 $144.18\pm 0.06\mathrm{s}$. This star seems to be well suited for high precision measurements, which could detect a possible multi-mode pulsation behaviour

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

References in corpus (4)

• The binary fraction of extreme horizontal branch stars
• The Potential of Asteroseismology for Hot, Subdwarf B Stars: A New Class of Pulsating Stars?
• Resolving subdwarf B stars in binaries by HST imaging
• CCD-based observations of PG 0856+121 and a theoretical analysis of its oscillation modes

Cited by in corpus (6)

• A survey for pulsating subdwarf B stars with the Nordic Optical Telescope
• First Attempt at Spectroscopic Detection of Gravity Modes in a Long-Period Pulsating Subdwarf B Star -- PG 1627+017
• Time-resolved FUSE Photometric and Spectroscopic Observations: PG1219+534, PG1605+072, and PG1613+426
• Orbital Characteristics of the Subdwarf-B and F V Star Binary EC~20117-4014(=V4640 Sgr)
• The EXOTIME project: Signals in the $O-C$ diagrams of the rapidly pulsating subdwarfs DW Lyn, V1636 Ori, QQ Vir, and V541 Hya
• Anomalous Orbital Characteristics of the AQ Col (EC 05217-3914) System