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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. In: Astronomical Journal, Vol. 156, No. 3, 130
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Abstract

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.