Journal
ASTRONOMY & ASTROPHYSICS
Volume 562, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201323115
Keywords
binaries: spectroscopic; subdwarfs
Categories
Funding
- Deutsche Forschungsgemeinschaft (DUG) [HE1356/45-1]
- European Research Council under the European Community [227224]
- Paranal Observatory of the European Southern Observatory for programmes [165.H-0588(A), 167.H-0407(A)]
- La Silla Observatory of the European Southern Observatory for programmes [073.D-0495(A), 079.D-0288(A), 080.D-0685(A), 082.D-0649(A), 086.D-0714(A)]
- STFC [ST/J000035/1, PP/F000057/1, PP/D000955/1, ST/J001384/1, ST/G002355/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G002355/1, PP/D000955/1, ST/J000035/1, ST/J001384/1, PP/F000057/1] Funding Source: researchfish
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The project Massive Unseen Companions to Hot Faint Underhuninous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars (sdBs) with massive compact companions such as white dwarfs, neutron stars, or stellar-mass black holes. In a supplementary programme we obtained time-resolved spectroscopy of known hot subdwarf binary candidates. Here we present orbital solutions of eight close sdB binaries with orbital periods ranging from similar to 0.1 d to 10 d, which allow us to derive lower limits on the masses of their companions. Additionally, a dedicated photometric follow-up campaign was conducted to obtain light curves of the reflection-effect binary HS 2043+0615. We are able to constrain the most likely nature of the companions in all cases but one, making use of information derived from photometry and spectroscopy. Four sdBs have white dwarf companions, while another three are orbited by low-mass main sequence stars of spectral type M.
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