Browsing Research publications by Author "Maxted, P.F.L."
Now showing items 1-13 of 13
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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 ... -
Follow-up Observations of SPY White Dwarf + M-Dwarf Binaries
Maxted, P.F.L.; Napiwotzki, R.; Marsh, T.R.; Burleigh, M.R.; Dobbie, P.D.; Hogan, E.; Nelemans, G. (Astronomical Society of the Pacific, 2007)We present the results of follow-up observations of white-dwarf + M-dwarf binaries identified using spectra obtained as part of the SPY survey. Spectra of the Hα region were obtained with the SPIRAL spectrograph on the AAT ... -
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 ... -
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 metallicity of CM Draconis
Viti, S.; Jones, H.R.A.; Maxted, P.F.L.; Tennyson, J. (2002) -
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 ... -
A near-infrared spectroscopic detection of the brown dwarf in the post common envelope binary WD 0137-349
Burleigh, M.R.; Hogan, E.; Dobbie, P.D.; Napiwotzki, R.; Maxted, P.F.L. (2006) -
Six detached white-dwarf close binaries
Morales-Rueda, L.; Maxted, P.F.L.; Nelemans, G.; Karl, C.; Napiwotzki, R.; Moran, C.; Marsh, T.R. (2005-05) -
Stellar Wind Signatures in sdB Stars
Heber, U.; Maxted, P.F.L.; Marsh, T.R.; Knigge, C.; Drew, J.E. (Astronomical Society of the Pacific, 2003)Subdwarf B (sdB) stars form the blue end of the horizontal branch. Their peculiar atmospheric-abundance patters result from diffusion processes. However, diffusion models fail to explain these anomalies quantitatively. ... -
A study of two post-common envelope binary systems
Exter, K.M.; Pollacco, D.L.; Maxted, P.F.L.; Napiwotzki, R.; Bell, S.A. (2005)We present intermediate-resolution, phase-resolved spectra of the close-binary systems EC 11575−1845 and V664 Cas, the central star of the planetary nebula HFG 1. Both systems have a very rich emission-line spectrum ... -
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 ... -
Survival of a brown dwarf after engulfment by a red giant star
Maxted, P.F.L.; Napiwotzki, R.; Dobbie, P.D.; Burleigh, M.R. (2006) -
Testing Magnetic Braking: The X-ray Activity of M Dwarfs in Pre-Cataclysmic Variable Systems
Briggs, K.R.; Napiwotzki, R.; Maxted, P.F.L.; Wheatley, P.J. (Astronomical Society of the Pacific, 2007)Angular momentum loss by magnetic braking is believed to be an important mechanism in the evolution of tidally-locked white dwarf (WD) bina- ries. We measure the X-ray emission of a sample of M dwarfs in pre-cataclysmic ...