Geier, S., Heber, U., Tillich, A., Hirsch, H., Edelmann, H., Schaffenroth, V., Kupfer, T., Mueller, S., Maxted, P. F. L., Ostensen, R., Podsiadlowski, P., Marsh, T., Gaensicke, B., Morales-Rueda, L., Nelemans, G., Napiwotzki, R., Guenther, E. W. and Carone, L. (2010). Hot subdwarfs in binary systems and the nature of their unseen companions. Astrophys. Space Sci., 329 (1-2). S. 91 - 100. DORDRECHT: SPRINGER. ISSN 1572-946X

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Abstract

A large fraction of the sdB stars reside in short period binaries. It is therefore clear that binary evolution plays an important role in the still unsolved problem of hot subdwarf formation. Here we present new results from different projects devoted to the analysis of sdBs in close binaries. The nature and masses of the unseen companions of 31 sdBs have been constrained by an analysis of high resolution spectra. In the course of this study candidate systems with massive compact companions have been discovered. The HYPERMUCHFUSS project aims at finding such systems making use of the huge spectral database of SDSS. A multi-site follow-up campaign of promising radial velocity variable sdBs started in 2009 and preliminary results are shown here. The most recent discovery of a substellar companion to the bright sdB HD 149382 may provide new evidence for the decisive role of low mass companions for sdB formation in general. A mysterious IR-excess has been detected, which may be caused by this otherwise invisible companion. Another low mass companion has been found to orbit the sdB star EGB 5 within 16.5 days. The space mission CoRoT is performing wide field and high precision photometry. First preliminary results from a spectroscopic survey of the COROT fields are also reported.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Geier, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heber, U.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tillich, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirsch, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Edelmann, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schaffenroth, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kupfer, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Maxted, P. F. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ostensen, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Podsiadlowski, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marsh, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gaensicke, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Morales-Rueda, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nelemans, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Napiwotzki, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, E. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Carone, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-495123
DOI: 10.1007/s10509-010-0327-9
Journal or Publication Title: Astrophys. Space Sci.
Volume: 329
Number: 1-2
Page Range: S. 91 - 100
Date: 2010
Publisher: SPRINGER
Place of Publication: DORDRECHT
ISSN: 1572-946X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
LOW-MASS; WHITE-DWARF; B-STARS; KPD 1930+2752; ORIGIN; PROGENITORS; SUPERNOVAEMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49512

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