Browsing University of Hertfordshire by Author "Gansicke, B.T."

Now showing items 1-15 of 15

    • Binaries discovered by the MUCHFUSS project SDSS J08205+0008 - An eclipsing subdwarf B binary with brown dwarf companion 

      Geier, S.; Schaffenroth, V.; Drechsel, H.; Heber, U.; Kupfer, T.; Tillich, A.; Ostensen, R.; Smolders, K.; Degroote, P.; Maxted, P.F.L.; Barlow, B.N.; Gansicke, B.T.; Marsh, T.R.; Napiwotzki, R. (2011)
      Hot subdwarf B stars (sdBs) are extreme horizontal branch stars believed to originate from close binary evolution. Indeed about half of the known sdB stars are found in close binaries with periods ranging from a few hours ...

    • High spatial resolution Galactic 3D extinction mapping with IPHAS 

      Sale, S.E.; Drew, J.E.; Unruh, Y.C.; Irwin, M.J.; Knigge, C.; Phillips, S.; Zijlstra, A.A.; Gansicke, B.T.; Greimel, R.; Groot, P.; Mampaso, A.; Morris, R.A.H.; Napiwotzki, R.; Steeghs, D.; Walton, N.A. (2009)
      We present an algorithm (MEAD, for ‘Mapping Extinction Against Distance’) which will determine intrinsic (r′−i′) colour, extinction, and distance for early-A to K4 stars extracted from the IPHAS r′/i′/Hα photometric data ...

    • The Hyper-MUCHFUSS project : probing the Galactic halo with sdB stars 

      Tillich, A.; Heber, U.; Geier, S.; Hirsch, H.; Maxted, P.F.L.; Gansicke, B.T.; Marsh, T.R.; Napiwotzki, R.; Ostensen, R.; Scholz, R.D. (2011)
      Context. High-velocity stars in the Galactic halo, e. g. the so-called hyper-velocity stars (HVS), are important tracers of the properties of the dark matter halo, in particular its mass. Aims. A search for the fastest ...

    • The INT Photometric Ha Survey of the Northern Galactic Plane (IPHAS) 

      Drew, J.E.; Greimel, R.; Irwin, M.J.; Aungwerojwit, A.; Barlow, M.J.; Corradi, R.L.M.; Drake, J.; Gansicke, B.T.; Groot, P.; Hales, A.; Hopewell, E.C.; Irwin, J.; Knigge, C.; Leisy, P.; Lennon, D.J.; Mampaso, A.; Masheder, M.R.W.; Matsuura, M.; Morales-Rueda, L.; Morris, R.A.H.; Parker, Q.A.; Phillipps, S.; Rodriguez-Gil, P.; Roelofs, G.; Skillen, I.; Sokoloski, J.; Steeghs, D.; Unruh, Y.C.; Viironen, K.; Vink, J.S.; Walton, N.A.; Witham, A.R.; Wright, Nick; Zijlstra, A.A.; Zurita, A. (2005)

    • The IPHAS catalogue of Hα emission-line sources in the northern Galactic plane 

      Witham, A.R.; Knigge, C.; Drew, J.E.; Greimel, R.; Steeghs, D.; Gansicke, B.T.; Groot, P.; Mampaso, A. (2008)
      We present a catalogue of point-source Hα emission-line objects selected from the INT/WFC Photometric Hα Survey (IPHAS) of the northern Galactic plane.

    • IPHAS discoveries of young stars towards Cyg OB2 and its southern periphery 

      Vink, J.S.; Drew, J.E.; Steeghs, D.; Wright, Nick; Martin, E.L.; Gansicke, B.T.; Greimel, R.; Drake, J. (2008)
      We report on the discovery of over 50 strong Hα emitting objects towards the large OB association Cyg OB2 and the H ii region DR 15 on its southern periphery. This was achieved using the INT Photometric Hα Survey of the ...

    • Massive unseen companions to hot faint underluminous stars from SDSS (MUCHFUSS) - Analysis of seven close subdwarf B binaries 

      Geier, S.; Maxted, P.F.L.; Napiwotzki, R.; Ostensen, R.; Heber, U.; Hirsch, H.; Kupfer, T.; Muller, S.; Tillich, A.; Barlow, B.N.; Oreiro, R.; Ottosen, T.A.; Copperwheat, C.; Gansicke, B.T.; Marsh, T.R. (2011)
      The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions like massive white dwarfs (M > 1.0 ), neutron stars or stellar ...

    • The MUCHFUSS project - Searching for hot subdwarf binaries with massive unseen companions : survey, target selection and atmospheric parameters 

      Geier, S.; Hirsch, H.; Tillich, A.; Maxted, P.F.L.; Bentley, S.J.; Ostensen, R.; Heber, U.; Gansicke, B.T.; Marsh, T.R.; Napiwotzki, R.; Barlow, B.N.; O'Toole, S. (2011)
      The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding sdBs with compact companions like supermassive white dwarfs (M > 1.0M⊙), neutron stars or black holes. The existence ...

    • Newly discovered cataclysmic variables from the INT/WFC photometric Ha survey of the northern Galactic plane 

      Witham, A.R.; Knigge, C.; Aungwerojwit, A.; Drew, J.E.; Gansicke, B.T.; Greimel, R.; Groot, P.; Roelofs, G.; Steeghs, D.; Woudt, P. (2007)

    • The orbital period of V458 Vulpeculae, a post-double common-envelope nova 

      Rodriguez-Gil, P.; Santander-Garcia, M.; Knigge, C.; Corradi, R.L.M.; Gansicke, B.T.; Barlow, M.J.; Drake, J.; Drew, J.E.; Miszalski, B.; Napiwotzki, R.; Steeghs, D.; Wesson, R.; Zijlstra, A.A.; Jones, D.H.; Liimets, T.; Munoz-Darias, T.; Pyrzas, S.; Rubio-Diez, M. (2010)
      We present time-resolved optical spectroscopy of V458 Vulpeculae (Nova Vul 2007 No. 1) spread over a period of 15 months starting 301 d after its discovery. Our data reveal radial-velocity variations in the He II lambda ...

    • The properties of cataclysmic variables in photometric Ha surveys 

      Witham, A.R.; Knigge, C.; Gansicke, B.T.; Aungwerojwit, A.; Corradi, R.M.; Drew, J.E.; Greimel, R.; Groot, P.; Morales-Rueda, L.; Rodriguez-Flores, E.R.; Rodriguez-Gil, P.; Steeghs, D. (2006)

    • The second data release of the INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS DR2) 

      Barentsen, Geert; Farnhill, Hywel John; Drew, J.E.; Gonzalez-Solares, E.A.; Greimel, R.; Irwin, M.J.; Miszalski, Brent; Ruhland, Christine; Groot, P.; Mampaso, A.; Sale, S. E.; Henden, A.A.; Aungwerojwit, A.; Barlow, M.J.; Carter, P.R.; Corradi, R.L.M.; Drake, J. J.; Eisloffel, J.; Fabregat, J.; Gansicke, B.T.; Gentile Fusillo, N. P.; Greiss, S.; Hales, A.S.; Hodgkin, S.; Huckvale, L.; Irwin, J.; King, R.; Knigge, C.; Kupfer, T.; Lagadec, E.; Lennon, D.J.; Lewis, J.R.; Mohr-Smith, M.; Morris, R.A.H.; Naylor, T.; Parker, Q. A.; Phillipps, S.; Pyrzas, S.; Raddi, Roberto; Roelofs, G.; Rodriguez-Gil, P.; Sabin, L.; Scaringi, Simone; Steeghs, D.; Suso, J.; Tata, R.; Unruh, Y.C.; van Roestel, J.; Viironen, K.; Vink, J.S.; Walton, N.A.; Wright, Nick; Zijlstra, A.A. (2014-11-11)
      The INT/WFC Photometric Hα Survey of the Northern Galactic Plane (IPHAS) is a 1800 deg2 imaging survey covering Galactic latitudes |b| < 5° and longitudes ℓ = 30°–215° in the r, i, and Hα filters using the Wide Field Camera ...

    • The substellar companion in the eclipsing white dwarf binary SDSS J141126.20+200911.1 

      Littlefair, S.P.; Casewell, S.L.; Parsons, S.G.; Dhillon, V. S.; Marsh, T.R.; Gansicke, B.T.; Bloemen, S.; Catalan, Silvia; Irawati, P.; Hardy, L.K.; Mcallister, M.; Bours, M.C.P.; Richichi, A.; Burleigh, M.R.; Burningham, B.; Breedt, E.; Kerry, P. (2014-12-01)
      We present high time resolution SDSS-g′ and SDSS-z′ light curves of the primary eclipse in SDSS J141126.20+200911.1, together with time-resolved X-Shooter spectroscopy and near-infrared (NIR) JHKs photometry. Our observations ...

    • A survey for post-common-envelope binary stars using GALEX and SDSS photometry 

      Maxted, P.F.L.; Gansicke, B.T.; Burleigh, M.R.; Southworth, J.; Marsh, T.R.; Napiwotzki, R.; Nelemans, G.; Wood, P.L. (2009)
      We report the first results of our programme to obtain multi-epoch radial velocity measurements of stars with a strong far-ultraviolet excess to identify post-common-envelope binaries (PCEBs). The targets have been identified ...

    • The UV-excess survey of the northern galactic plane 

      Groot, P.; Verbeek, K.; Greimel, R.; Irwin, M.J.; Gonzalez-Solares, E.; Gansicke, B.T.; De Groot, E.; Drew, J.E.; Napiwotzki, R.; Weston, S.; Deacon, Niall (2009)
      The UV-Excess survey of the northern Galactic plane images a 10°× 185° wide band, centred on the Galactic equator using the 2.5-m Isaac Newton Telescope in four bands ( U, g, r, He i 5875) down to ∼21–22 mag ( ~20 in He i ...