The OGLE Collection of Variable Stars

OGLE Collection of Galactic Cepheids

"OGLE Collection of Galactic Cepheids"
A. Udalski, I. Soszyński, P. Pietrukowicz, M. K. Szymański, D. M. Skowron, J. Skowron, P. Mróz, R. Poleski, S. Kozłowski, K. Ulaczyk, K. Rybicki, P. Iwanek and M. Wrona
Acta Astronomica, 68, 315 (arXiv:1810.09489)

We present here a new major part of the OGLE Collection of Variable Stars - OGLE Collection of Galactic Cepheids. The new dataset was extracted from the Galaxy Variability Survey images - a dedicated large-scale survey of the Galactic disk and outer bulge conducted by the OGLE project since 2013.

Milky Way
Cepheids in the sky

Presently the OGLE Collection contains 2807 Cepheids of all types - 1514 classical (magenta dots), 1238 type II (green dots) and 55 anomalous (black dots). It more than doubles the number of known Galactic classical Cepheids. Due to the long-term monitoring and large number of epochs the selected sample is very pure, generally free from contaminating stars of other types often mimicking Cepheids. Its completeness is high at 90% level for classical Cepheids - tested using recent samples of Galactic Cepheids: ASAS-SN, ATLAS, Gaia DR2 and Wise catalog of variable stars.

We also present several interesting objects found in the new OGLE Collection - multi-mode pulsators:

Two new
double mode type II Galactic Cepheids

first Galactic candidates for eclipsing systems containing Cepheid:

Cepheids in eclipsing systems

a binary Cepheid candidate:

Cepheids in eclipsing systems

New OGLE Collection of Galactic Cepheids is available for the astronomical community from the OGLE Internet Archive in similar form as previous parts of the OGLE Collection of Variable Stars.

PLEASE cite the following papers when using the data or referring to these OGLE results:
Udalski et al., 2018, Acta Astronomica, 68, 315 (arXiv:1810.09489)

Any comments about the data and the form of their presentation are welcome as they can improve the future releases of OGLE analysis. Send your messages to this address.