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      Fbs 0117+396 pulsating sdb star photometry

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      Creators
      Ostensen, R.H.
      Geier, S.
      Schaffenroth, V.
      Telting, J.H.
      Bloemen, S.L.D.
      Nemeth, P.
      Beck, P.G.
      Lombaert, R.
      Papics, P.I.
      Tillich, A.
      Ziegerer, E.
      Machado, L. Fox
      Littlefair, S.
      Dhillon, V.
      Aerts, C.
      Heber, U.
      Maxted, P.F.L.
      Gansicke, B.T.
      Marsh, T.R.
      Date of Archiving
      2013
      Archive
      ViZieR
      Related links
      https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/559/A35
      DOI
      https://doi.orghttps://doi.org/10.26093/cds/vizier.35590035
      Related publications
      Binaries discovered by the MUCHFUSS project : FBS0117+396: An sdB+dM binary with a pulsating primary  
      Publication type
      Dataset
      Access level
      Open access
      Please use this identifier to cite or link to this item: https://hdl.handle.net/2066/122683   https://hdl.handle.net/2066/122683
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      Organization
      Astrophysics
      Audience(s)
      Astronomy, astrophysics
      Key words
      subdwarfs; surveys; binaries close; stars: oscillations; stars: individual: FBS 0117+396
      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>1.0M☉), 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 45-min 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
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      • Datasets [1393]
      • Faculty of Science [33757]
       
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