Back to Search
Start Over
Dwarf spheroidal satellites of M31: I. Variable stars and stellar populations in Andromeda XIX
- Publication Year :
- 2013
- Publisher :
- arXiv, 2013.
-
Abstract
- We present B,V time-series photometry of Andromeda XIX (And XIX), the most extended (half-light radius of 6.2') of Andromeda's dwarf spheroidal companions, that we observed with the Large Binocular Cameras at the Large Binocular Telescope. We surveyed a 23'x 23' area centered on And XIX and present the deepest color magnitude diagram (CMD) ever obtained for this galaxy, reaching, at V~26.3 mag, about one magnitude below the horizontal branch (HB). The CMD shows a prominent and slightly widened red giant branch, along with a predominantly red HB, which, however, extends to the blue to significantly populate the classical instability strip. We have identified 39 pulsating variable stars, of which 31 are of RR Lyrae type and 8 are Anomalous Cepheids (ACs). Twelve of the RR Lyrae variables and 3 of the ACs are located within And XIX's half light radius. The average period of the fundamental mode RR Lyrae stars ( = 0.62 d, \sigma= 0.03 d) and the period-amplitude diagram qualify And XIX as an Oosterhoff-Intermediate system. From the average luminosity of the RR Lyrae stars ( = 25.34 mag, \sigma= 0.10 mag) we determine a distance modulus of (m-M)$_0$=$24.52\pm0.23$ mag in a scale where the distance to the Large Magellanic Cloud (LMC) is $18.5\pm0.1$ mag. The ACs follow a well defined Period-Wesenheit (PW) relation that appears to be in very good agreement with the PW relationship defined by the ACs in the LMC.<br />Comment: accepted for publication in ApJ
- Subjects :
- Cepheid variable
galaxies: dwarf
galaxies: individual (Andromeda XIX)
Local Group
stars: distances
stars: variables: general
techniques: photometric
LARGE-MAGELLANIC-CLOUD
RR-LYRAE STARS
GRAVITATIONAL LENSING
EXPERIMENT
OGLE-III CATALOG
GLOBULAR-CLUSTER
GALAXY FORMATION
BRANCH STARS
LOCAL GROUP
SPACED DATA
OUTER HALO
astro-ph.GA
FOS: Physical sciences
Astrophysics
RR Lyrae variable
Large Magellanic Cloud
Physics
Astronomy and Astrophysics
Horizontal branch
Astronomy and Astrophysic
Astrophysics - Astrophysics of Galaxies
Red-giant branch
Distance modulus
stars: distance
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Variable star
Instability strip
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....df6287ce7e8faffbd8f1355157677935
- Full Text :
- https://doi.org/10.48550/arxiv.1310.1809