Journal
ASTRONOMY & ASTROPHYSICS
Volume 577, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201525666
Keywords
binaries: spectroscopic; subdwarfs; stars: horizontal-branch; stars: atmospheres
Categories
Funding
- UK's Science and Technology Facilities Council [ST/L000733/1]
- Deutsche Forschungsgemeinschaft (DFG) [HE1356/45-2, HE1356/62-1]
- Netherlands Research School for Astronomy
- Deutsches Zentrum fur Luft- und Raumfahrt (DLR) [50 OR 1110]
- Alfred P. Sloan Foundation
- Participating Institutions
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- Science and Technology Facilities Council [ST/L000733/1] Funding Source: researchfish
- STFC [ST/L000733/1] Funding Source: UKRI
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The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims to find sdBs with compact companions such as massive white dwarfs, neutron stars, or black holes. Here we provide classifications, atmospheric parameters, and a complete radial velocity ( RV) catalogue containing 1914 single measurements for a sample of 177 hot subluminous stars discovered based on SDSS DR7; 110 stars show significant RV variability, while 67 qualify as candidates. We constrain the fraction of close massive compact companions of hydrogen-rich hot subdwarfs in our sample to be smaller than similar to 1.3%, which is already close to the theoretical predictions. However, the sample might still contain such binaries with longer periods exceeding similar to 8 d. We detect a mismatch between the Delta RVmax-distribution of the sdB and the more evolved sdOB and sdO stars, which challenges our understanding of their evolutionary connection. Furthermore, irregular RV variations of unknown origin with amplitudes of up to similar to 180 km s(-1) on timescales of years, days, and even hours have been detected in some He-sdO stars. They might be connected to irregular photometric variations in some cases.
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