2013A&A...559A..35O

Query : 2013A&A...559A..35O

2013A&A...559A..35O - Astronomy and Astrophysics, volume 559A, 35-35 (2013/11-1)

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

OSTENSEN R.H., GEIER S., SCHAFFENROTH V., TELTING J.H., BLOEMEN S., NEMETH P., BECK P.G., LOMBAERT R., PAPICS P.I., TILLICH A., ZIEGERER E., FOX MACHADO L., LITTLEFAIR S., DHILLON V., AERTS C., HEBER U., MAXTED P.F.L., GAENSICKE B.T. and MARSH T.R.

Abstract (from CDS):

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>1.0M_☉), 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 FBS0117+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=0.252d, 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 379s, and at least eight modes are found with periods between 45min and 2.5h. This establishes that FBS0117+396 is an sdB+dM reflection binary, in which the primary is a hybrid pulsator, and the first one found with this particular melange of flavours.

Abstract Copyright: ∼

Journal keyword(s): subdwarfs - surveys - binaries: close - stars: oscillations - stars: individual: FBS 0117+396

VizieR on-line data: <Available at CDS (J/A+A/559/A35): ucam.dat merc.dat oan.dat>

Simbad objects: 15

Full paper

View the references in ADS

Number of rows : 15

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	FBS 0117+396	HS*	01 20 22.9396883304	+39 50 59.434295604		15.15	15.34			sdB+dM	27	0
2	HE 0230-4323	HS*	02 32 54.6772339416	-43 10 27.791218308			13.78			sdB	32	0
3	Cl Melotte 20 488	HS*	03 21 39.6300972744	+47 27 18.797557932		11.54	11.73	11.83	11.55	sdB	21	0
4	KUV 04421+1416	HS*	04 44 56.8983457992	+14 21 50.176351836		15.28				sdB	34	0
5	HD 269696	HS*	05 31 40.3594532592	-69 53 02.153902236	9.74	10.92	11.15			sdB+dM	191	0
6	GALEX J063952.0+515658	HS*	06 39 52.1822938800	+51 57 01.262380032		11.84	12.00			sdBHe1	15	0
7	V* DW Lyn	HS*	07 07 09.7960158264	+60 38 50.159268348		14.7		15.34		sdB	53	1
8	GALEX J080656.7+152718	HS*	08 06 56.6844688416	+15 27 19.968237288		14.30	14.69	14.72	14.80	sdB	19	0
9	Feige 48	HS*	11 47 14.4978515760	+61 15 31.789400364		13.12	13.28			sdB	118	0
10	V* NY Vir	HS*	13 38 48.1466908176	-02 01 49.207286748		13.43	13.66	13.75		sdB1VIIHe1	218	1
11	NGC 6791	OpC	19 20 53.0	+37 46 41		10.52	9.5			~	1018	0
12	UCAC4 686-068711	HS*	19 24 58.1497315488	+47 07 53.672050236		15.649	15.640	15.947		sdB	37	0
13	Kepler-451	HS*	19 38 32.6123816016	+46 03 59.135231952		12.17	12.69	12.46	12.399	sdB+dM	76	0
14	GALEX J201337.6+092801	HS*	20 13 37.6121506872	+09 28 01.414212024		12.02	12.23	12.82		sdOB	11	0
15	JL 87	HS*	21 48 37.7351993616	-76 20 44.612786472	11.04	11.96	12.07			sdBHe	38	0

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