NDLI: Binaries discovered by the MUCHFUSS project — FBS 0117+396: An sdB+dM binary with a pulsating primary

Content Provider	EDP Sciences
Author	R. H. Østensen S. Geier V. Schaffenroth J. H. Telting S. Bloemen P. Németh P. G. Beck R. Lombaert P. I. Pápics A. Tillich E. Ziegerer L. Fox Machado S. Littlefair V. Dhillon C. Aerts U. Heber P. F. L. Maxted B. T. Gänsicke T. R. Marsh
Abstract	The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims to discover subdwarf-B stars with massive compact companions such as overmassive white dwarfs (M > 1.0 M_{⊙_{), neutron stars or black holes. From the 127 subdwarfs with substantial radial-velocity variations discovered in the initial survey, a number of interesting objects have been selected for extensive follow-up. After an initial photometry run with BUSCA revealed that FBS 0117+396 is photometrically variable both on long and short timescales, we chose it as an auxiliary target during a 6-night multi-color photometry run with Ultracam. Spectroscopy was obtained at a number of observatories in order to determine the binary period and obtain a radial-velocity amplitude. After establishing an orbital period of P = 0.252 d, and removing the signal associated with the irradiated hemisphere of the M-dwarf companion, we were able to detect ten pulsation periods in the Fourier spectrum of the light curve. Two pulsation modes are found to have short periods of 337 and 379 s, and at least eight modes are found with periods between 45 min and 2.5 h. This establishes that FBS 0117+396 is an sdB+dM reflection binary, in which the primary is a hybrid pulsator, and the first one found with this particular mélange of flavours.}}
Page Count	11
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2013/11/aa22022-13/aa22022-13.html
e-ISSN	14320746
Journal	Astronomy & Astrophysics
Volume Number	559
DOI	10.1051/0004-6361/201322022
Language	English
Publisher	EDP Sciences
Publisher Date	2013-11-01
Access Restriction	Open
Rights Holder	© ESO, 2013
Subject Keyword	subdwarfs surveys binaries: close stars: oscillations stars: individual: FBS 0117+396 subdwarfs / surveys / binaries: close / stars: oscillations / stars: individual: FBS 0117+396
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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