Direct Measurement of Polaris' Diameter and its Position in the Cepheid Period-Radius Plane

Details Direct Measurement of Polaris' Diameter and its Position in the Cepheid Period-Radius Plane Direct Measurement of Polaris' Diameter and its Position in the Cepheid Period-Radius Plane

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.4606n&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #46.06; Bulletin of the American Astronomical Society, Vol. 32, p.747

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Mean angular diameters are presented for four cepheid variables measured with the Navy Prototype Optical Interferometer (NPOI). Trigonometric parallaxes measured by Hipparcos and the USNO Flagstaff Station are used to derive linear radii for α Ursae Minoris (Polaris), ζ Geminorum, δ Cephei and η Aquilae. These radii are compared to those found from theoretical and empirical period-radius relations in the literature. The observed diameter of Polaris is in excellent agreement with these relations only if it is a first overtone pulsator.

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