Hostname: page-component-cd9895bd7-jn8rn Total loading time: 0 Render date: 2024-12-23T10:21:05.364Z Has data issue: false hasContentIssue false
  • English
  • Français

RR Lyrae stars as probes of the Milky Way structure and formation

Published online by Cambridge University Press:  09 May 2016

Pawel Pietrukowicz  and
OGLE collaboration
Pawel Pietrukowicz
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

RR Lyrae stars being distance indicators and tracers of old population serve as excellent probes of the structure, formation, and evolution of our Galaxy. Thousands of them are being discovered in ongoing wide-field surveys. The OGLE project conducts the Galaxy Variability Survey with the aim to detect and analyze variable stars, in particular of RRab type, toward the Galactic bulge and disk, covering a total area of 3000 deg2. Observations in these directions also allow detecting background halo variables and unique studies of their properties and distribution at distances from the Galactic Center to even 40 kpc. In this contribution, we present the first results on the spatial distribution of the observed RRab stars, their metallicity distribution, the presence of multiple populations, and relations with the old bulge. We also show the most recent results from the analysis of RR Lyrae stars of the Sgr dwarf spheroidal galaxy, including its center, the globular cluster M54.

Keywords

Galaxy: structureGalaxy: formationstars: variables: RR Lyrae
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 116 - 119
Copyright
Copyright © International Astronomical Union 2016 

References

Marconi, M., Coppola, G., Bono, G., et al. 2015, ApJ, 808, 50Google Scholar
Jurić, M., Ivezić, Ž., Brooks, A., et al. 2008, ApJ, 673, 864Google Scholar
Jurcsik, J. 1995, AcA, 45, 653Google Scholar
Jurcsik, J. & Kovács, G. 1996, A&A, 312, 111Google Scholar
Kunder, A., et al. 2015, ApJL, 808, L12CrossRefGoogle Scholar
Pietrukowicz, P., et al. 2015, ApJ, 811, 113Google Scholar
Smolec, , 2005, AcA, 55, 59Google Scholar
Soszyński, I., Udalski, A., & Szymański, M. K., et al. 2014, AcA, 64, 177Google Scholar
Udalski, A., Szymański, M., Kaluzny, J., Kubiak, M., & Mateo, M. 1992, AcA, 42, 253Google Scholar
Udalski, A., Szymański, M., & Szymański, G. 2015, AcA, 65, 1Google Scholar