Forthcoming Cepheid Database

Cepheid distances from Interferometry

Long baseline interferometry is now able to resolve the pulsational change of the angular diameter of a significant number of Cepheids in the solar neighborhood. This allows the application of a new version of the Baade-Wesselink (BW) method to measure their distance, for which we do not need to estimate the star’s temperature. Using angular diameter measurements from the VLT Interferometer, we...

Triple - Mode Cepheid Masses

Observations of the light variations of AC Andromedae and TU Cassiopeiae are reviewed. The radial fundamental, first overtone, second overtone, and three nonlinear coupling beat pulsation periods of AC And are presented, confirming the Fitch and Szeidl work. For TU Cas the radial fundamental, first overtone, and several nonlinear coupling beat periods can be found, and a Fourier analysis has co...

Cepheid Standard Candles

Thanks to HST, there are now many galaxies with Cepheid distances and these provide the main platform for the calibration of the secondary distance indicators. I review recent progress in our understanding of the standard candle properties of Cepheids with particular emphasis on the techniques used in the HST studies. The PL relation defined by Cepheids in the LMC is shown to be excellent, alth...

The Cepheid Luminosity Scale

Forthcoming Activities

are residential courses and will be held at Royal Holloway College, Englefield Green, Surrey, from July 5th to 23rd, and at Grove House, Roehampton, from September 6th to 25th, 1948. Teachers who wish to attend should apply to their own Local Authorities for the necessary form. From April 6th to 13th, 1948, a short Course will be held at 39 Queen Anne Street, W.l, for staffs of preparatory scho...