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Cepheids in M31: The PAndromeda Cepheid Sample

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.

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Mihael Kodric

Arno Riffeser

Ulrich Hopp

Claus Goessl

Stella Seitz

Ralf Bender

Johannes Koppenhoefer

Christian Obermeier

Jan Snigula

Chien-Hsiu Lee

W.S. Burgett

K.W. Hodapp

N. Kaiser

R.-P. Kudritzki

J.L. Tonry

R.J. Wainscoat


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.


Kodric, M., Riffeser, A., Hopp, U., Goessl, C., Seitz, S., Bender, R., …Wainscoat, R. (2018). Cepheids in M31: The PAndromeda Cepheid Sample. Astronomical Journal, 156(3), Article 130.

Journal Article Type Article
Acceptance Date Jun 19, 2018
Online Publication Date Aug 29, 2018
Publication Date Aug 29, 2018
Deposit Date Sep 13, 2018
Publicly Available Date Sep 13, 2018
Journal Astronomical Journal
Print ISSN 0004-6256
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 156
Issue 3
Article Number 130


Published Journal Article (5.5 Mb)

Copyright Statement
© 2018. The American Astronomical Society. All rights reserved.

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