Measuring Cepheid Angular Sizes Directly using the Palomar Testbed Interferometer

Details Measuring Cepheid Angular Sizes Directly using the Palomar Testbed Interferometer Measuring Cepheid Angular Sizes Directly using the Palomar Testbed Interferometer

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.7502k&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #75.02; Bulletin of the American Astronomical Society, Vol. 31, p.1480

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Measuring Cepheid Angular Sizes Directly using the Palomar Testbed Interferometer We are monitoring several Cepheids with the Palomar Testbed Interferometer (PTI) to measure their angular diameters at H and K bands. PTI, with its large baseline (110 meters), is sensitive to stellar diameters of 1.5-4.5 mas at K band. We have undertaken a long-term investigation of the pulsations of one cepheid, Eta Aquila, and hope to detect a 2% variation in its squared visibility that reflects a 12% variation in its angular diameter. Some of our other targets include X Cygni and Zeta Geminorum. Directly measuring Cepheid angular diameters promises to help refine the theory of Cepheid pulsation and to remove uncertainty in the zero point of the Cepheid period-luminosity relationship, a rung in the cosmological distance ladder.

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