Radial Velocity Survey of Low-Mass Companions to sdB Stars

Details Radial Velocity Survey of Low-Mass Companions to sdB Stars Radial Velocity Survey of Low-Mass Companions to sdB Stars

2011-02-02

arxiv.org/abs/1102.0511v1

AIP Conference Proceedings, Volume 1331, pp. 297-303 (2011)

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Part of PlanetsbeyondMS/2010 proceedings http://arxiv.org/html/1011.6606

Scientific paper

10.1063/1.3570989

The origin of subdwarf B (sdB) stars is not fully understood yet since it requires high mass loss at the red giant stage. SdBs in close binary systems are formed via common envelope ejection, but the origin of apparently single sdB stars remains unclear. Substellar companions may be able to trigger common envelope ejection and help forming sdBs that appear to be single. Using a sample of high resolution spectra we aim at detecting small radial velocity (RV) shifts caused by such low mass (sub-)stellar companions. The RVs are measured with high accuracy using sharp metal lines. Our goal is to test the theoretical predictions and put constraints on the population of the lowest mass companions to sdB stars.

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