Angular diameters by the lunar occultation technique. IV - Alpha Leo and the Cepheid Zeta GEM

Details Angular diameters by the lunar occultation technique. IV - Alpha Leo and the Cepheid Zeta GEM Angular diameters by the lunar occultation technique. IV - Alpha Leo and the Cepheid Zeta GEM

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87..680r&link_type=abstract

Astronomical Journal, vol. 87, Apr. 1982, p. 680-684.

Astronomy and Astrophysics

Astronomy

19

Cepheid Variables, Diameters, Lunar Occultation, Stellar Spectrophotometry, Stellar Structure, Fresnel Diffraction, Limb Darkening, Stellar Temperature, Ubv Spectra

Scientific paper

Angular diameter measurements obtained by the lunar occultation technique are reported for Alpha Leonis and Zeta Geminorum. For the former, the uniform disk diameters obtained from measurements by the 1.3 m and 4 m telescopes were 1.46 + or - 0.37 and 1.42 + or - 0.10 milliarcsec. This measurement verifies the effectiveness of the occultation technique for an angular diameter near 1.5 milliarcsec, which represents a definite extension of the technique, and is fully consistent with measurements obtained by intensity interferometer. A measurement of the Cepheid Zeta Geminorum at phase 0.5961 yielded a uniform disk diameter of 1.81 + or - 0.31 milliarcsec and effective temperature of 5140 + or - 400. These are consistent with, but do not improve, estimates of these quantities based on less direct methods. An aperture mask was employed on the 4 m telescope in an attempt to optimize fringe contrast.

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