Cepheid Variables in Ecliping Binary Systems

Discovery of Cepheid Variables Inthe

We present the results of a survey for Cepheid variables in the Virgo Cluster spiral NGC 4571 using the High-Resolution Camera (HRCam) on the Canada-France-Hawaii Telescope. Our 13 epochs, taken over a span of 800 days, have typical FWHM of 0.50 arcsec enabling 10% photometry to R 24.5 mag. The application of point-spread tting photometry and both an automated and visual search for variability ...

Period, Color, and Luminosity for Cepheid Variables

Payne-Gaposehkin, Cecilia H. Period, Color, and Luminosity for Cepheid Variables. Smithsonian Contributions to Astrophysics, number 17, 10 pages, 8 tables, 1974.—The Cepheids of the Galaxy and the Magellanic Clouds display a gradation in properties, but when amplitude as well as period is taken into account, their intrinsic colors are sensibly similar. The periodluminosity relations in the thre...

Simultaneous Equation Systems Involving Binary Choice Variables

Triangular systems for symmetric binary variables

Abstract: We introduce and study distributions of sets of binary variables that are symmetric, that is each has equally probable levels. The joint distribution of these special types of binary variables, if generated by a recursive process of linear main effects is essentially parametrized in terms of marginal correlations. This contrasts with the log-linear formulation of joint probabilities i...

A comprehensive study of Cepheid variables in the Andromeda galaxy

Extragalactic Cepheids are the basic rungs of the cosmic distance scale. They are excellent standard candles, although their luminosities and corresponding distance estimates can be affected by the particular properties of the host galaxy. Therefore, the accurate analysis of the Cepheid population in other galaxies, and notably in the Andromeda Galaxy (M 31), is crucial to obtaining reliable di...