Geier, S., Maxted, P. F. L., Napiwotzki, Ralf, Østensen, R. H., Heber, U. (Ulrich), 1954-, Hirsch, H., Kupfer, T., Müller, S., Tillich, A., Barlow, B. N., Oreiro, R., Ottosen, T. A., Copperwheat, C. M., Gaensicke, B. T. (Boris T.) and Marsh, T. R.. (2011) Massive unseen companions to hot faint underluminous stars from SDSS (MUCHFUSS). Astronomy & Astrophysics, Vol.526 . A39. ISSN 0004-6361

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Abstract

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   M⊙), neutron stars or stellar mass black holes. The existence of such systems is predicted by binary evolution theory and recent discoveries indicate that they exist in our Galaxy. First results are presented for seven close binary sdBs with short orbital periods ranging from ≃0.21   d to 1.5   d. The atmospheric parameters of all objects are compatible with core helium-burning stars. The companions are most likely white dwarfs. In one case the companion could be shown to be a white dwarf by the absence of light-curve variations. However, in most cases late type main sequence stars cannot be firmly excluded. Comparing our small sample with the known population of close sdB binaries we show that our target selection method aiming at massive companions is efficient. The minimum companion masses of all binaries in our sample are high compared to the reference sample of known sdB binaries.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Dwarf stars, Double stars -- Spectra, Double stars, White dwarf stars
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Official Date:	February 2011
Volume:	Vol.526
Number of Pages:	13
Page Range:	A39
Identification Number:	10.1051/0004-6361/201015794
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Deutsche Forschungsgemeinschaft (DFG) , Seventh Framework Programme (European Commission) (FP7), European Research Council (ERC), Katholieke Universiteit te Leuven (1970- )
Grant number:	HE1356/45-1 (DFG), HE1356/49-1 (DFG), HE1356/44-1 (DFG), HE1356/48-1 (DFG), HE1356/50-1 (DFG), 2007–2013 (FP7), 227224 (ERC), GOA/2008/04 (KUL)
URI:	http://wrap.warwick.ac.uk/id/eprint/39762

Data sourced from Thomson Reuters' Web of Knowledge

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