Radial Velocity Confirmation of a Binary Detected from Pulse Timings

Details Radial Velocity Confirmation of a Binary Detected from Pulse Timings Radial Velocity Confirmation of a Binary Detected from Pulse Timings

2011-06-27

arxiv.org/abs/1106.5492v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in ApJ Letters; 5 pages, 2 figures, 3 tables; uses emulateapj

Scientific paper

A periodic variation in the pulse timings of the pulsating hot subdwarf B star CS 1246 was recently discovered via the O-C diagram and suggests the presence of a binary companion with an orbital period of two weeks. Fits to this phase variation, when interpreted as orbital reflex motion, imply CS 1246 orbits a barycenter 11 light-seconds away with a velocity of 16.6 km/s. Using the Goodman spectrograph on the SOAR telescope, we decided to confirm this hypothesis by obtaining radial velocity measurements of the system over several months. Our spectra reveal a velocity variation with amplitude, period, and phase in accordance with the O-C diagram predictions. This corroboration demonstrates that the rapid pulsations of hot subdwarf B stars can be adequate clocks for the discovery of binary companions via the pulse timing method.

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