Duty Cycle of Doppler Ground‐based Asteroseismic Observations11Based on observations made by E. Aristidi during the 2006 second overwinter at the French‐Italian Concordia Station, Dome C, Antarctica.

Abstract

ABSTRACTWe report the observations of the clear‐sky fraction at the Concordia station during winter 2006 and derive from it the duty cycle for the astronomical observations. The duty cycle and observation duration at Dome C allow for efficient asteroseismic observations. This performance is analyzed and compared to network observations. For network observations, simulations were run using the helioseismic Global Oscillation Network Group as a reference. Observations with one site in Antarctica provide performance similar to or better than that with a six‐site network, since the duty cycle limited by meteorology is as high as 92%. On bright targets, a 100 day long time series with a duty cycle of about 87% can be observed, which is not possible for a network observation.