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Durham University

Department of Physics

Staff profile

Publication details for Dr Peter W. Draper

Kodric, Mihael, Riffeser, Arno, Hopp, Ulrich, Goessl, Claus, Seitz, Stella, Bender, Ralf, Koppenhoefer, Johannes, Obermeier, Christian, Snigula, Jan, Lee, Chien-Hsiu, Burgett, W. S., Draper, P. W., Hodapp, K. W., Kaiser, N., Kudritzki, R.-P., Metcalfe, N., Tonry, J. L. & Wainscoat, R. J. (2018). Cepheids in M31: The PAndromeda Cepheid Sample. The Astronomical Journal 156(3): 130.

Author(s) from Durham


We present the largest Cepheid sample in M31 based on the complete Pan-STARRS1 survey of Andromeda (PAndromeda) in the r P1, i P1, and g P1 bands. We find 2686 Cepheids with 1662 fundamental-mode Cepheids, 307 first-overtone Cepheids, 278 type II Cepheids, and 439 Cepheids with undetermined Cepheid type. Using the method developed by Kodric et al., we identify Cepheids by using a three-dimensional parameter space of Fourier parameters of the Cepheid light curves combined with a color cut and other selection criteria. This is an unbiased approach to identify Cepheids and results in a homogeneous Cepheid sample. The period–luminosity relations obtained for our sample have smaller dispersions than in our previous work. We find a broken slope that we previously observed with HST data in Kodric et al., albeit with a lower significance.