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

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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 20 0
2 HE 0230-4323 HS* 02 32 54.6772339416 -43 10 27.791218308     13.78     sdB 27 0
3 Cl Melotte 20 488 HS* 03 21 39.6300972744 +47 27 18.797557932   11.54 11.73 11.83 11.55 sdB 17 0
4 KUV 04421+1416 HS* 04 44 56.8983457992 +14 21 50.176351836   15.28       sdB 29 0
5 HD 269696 HS* 05 31 40.3594532592 -69 53 02.153902236 9.74 10.92 11.15     sdB+dM 186 0
6 GALEX J063952.0+515658 HS* 06 39 52.1822938800 +51 57 01.262380032   11.84 12.00     sdBHe1 10 0
7 V* DW Lyn HS* 07 07 09.7960158264 +60 38 50.159268348   14.7   15.34   sdB 51 1
8 GALEX J080656.7+152718 HS* 08 06 56.6844688416 +15 27 19.968237288   14.30 14.69 14.72 14.80 sdB 14 0
9 Feige 48 HS* 11 47 14.4978515760 +61 15 31.789400364   13.12 13.28     sdB 114 0
10 V* NY Vir HS* 13 38 48.1466908176 -02 01 49.207286748   13.43 13.66 13.75   sdB1VIIHe1 210 1
11 NGC 6791 OpC 19 20 53 +37 46.7   10.52 9.5     ~ 987 0
12 2MASS J19245816+4707536 HS* 19 24 58.1497315488 +47 07 53.672050236           sdB 35 0
13 Kepler-451 HS* 19 38 32.6123816016 +46 03 59.135231952   12.17 12.69 12.46 12.399 sdB+dM 69 0
14 TYC 1077-218-1 HS* 20 13 37.6121506872 +09 28 01.414212024   12.02 12.23 12.82   sdOB 7 0
15 JL 87 HS* 21 48 37.7351993616 -76 20 44.612786472 11.04 11.96 12.07     sdBHe 33 0

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2023.01.30-21:53:47

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