Cepheids in M31: The PAndromeda Cepheid Sample
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.
- Publication:
-
The Astronomical Journal
- Pub Date:
- September 2018
- DOI:
- 10.3847/1538-3881/aad40f
- arXiv:
- arXiv:1806.07895
- Bibcode:
- 2018AJ....156..130K
- Keywords:
-
- catalogs;
- distance scale;
- galaxies: individual: M31;
- Local Group;
- stars: variables: Cepheids;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 79 pages, 39 figures, 8 tables, accepted for publication in AJ, K18b is submittted to ApJ, electronic data will be available on CDS