Interferometry and asteroseismology: The radius of tau Cet

Details Interferometry and asteroseismology: The radius of tau Cet Interferometry and asteroseismology: The radius of tau Cet

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...406l..15p&link_type=abstract

Astronomy and Astrophysics, v.406, p.L15-L18 (2003)

Astronomy and Astrophysics

Astrophysics

25

Stars: Fundamental Parameters, Stars: Oscillations, Stars: Evolution, Stars: Individual: Tau Cet

Scientific paper

We have determined from interferometry the radius of the nearby star tau Cet, using recent observations with the VINCI instrument on VLTI using the siderostats. The limb-darkened disk diameter is determined, with an unprecedented internal precision of 0.5%, to be 1.971 +/- 0.009_(int.)+/- 0.05_(ext.) mas, corresponding to a physical radius of 0.773 +/- 0.004_(int.)+/- 0.02_(ext.) Rsun. With this determination tau Cet becomes a prime target for asteroseismic campaigns to determine its internal structure, and thereby test stellar evolution theory. We discuss implications for asteroseismology and present predictions for oscillation properties.
Based on observations collected at the European Southern Observatory, Chile.

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