RV survey of low-mass companions to sdB stars

Details RV survey of low-mass companions to sdB stars RV survey of low-mass companions to sdB stars

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..247c&link_type=abstract

17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 247-250 (2010).

Computer Science

Stellar Mass, Subgiant Stars, Spectrographs, Masses, Giant And Subgiant Stars, Photometric, Polarimetric, And Spectroscopic Instrumentation

Scientific paper

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 sdBs 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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