Open AccessDeep Canada–France–Hawaii Telescope photometric survey of the entire M33 galaxy – I. Catalogue of 36 000 variable point sources ★
Author(s) -
Hartman J. D.,
Bersier D.,
Stanek K. Z.,
Beaulieu J.P.,
Kaluzny J.,
Marquette J.B.,
Stetson P. B.,
SchwarzenbergCzerny A.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10764.x
Subject(s) - physics , cepheid variable , astronomy , galaxy , local group , variable star , astrophysics , red giant branch , telescope , supergiant , milky way , stars , globular cluster
We have conducted a variability survey of the Local Group galaxy M33, using g ′, r ′, and i ′ observations from 27 nights spanning 17 months, made with the MegaPrime/MegaCam instrument on the 3.6‐m Canada–France–Hawaii Telescope (CFHT). We identify more than 36 000 variable sources with g ′, r ′, i ′≲ 24, out of approximately two million point sources in a 1‐deg 2 field of view. This increases the number of known variables in this galaxy by more than a factor of 20. In this paper, we provide a brief description of the data and a general overview of the variable star population which includes more than 1300 candidate variable blue and red supergiant stars, more than 2000 Cepheids, and more than 19 000 long‐period variable asymptotic giant branch and red giant branch stars.