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Over 78 000 RR Lyrae Stars in the Galactic Bulge and Disk from the OGLE Survey

Soszyński, I. and Udalski, A. and Wrona, M. and Szymański, M. K. and Pietrukowicz, P. and Skowron, J. and Skowron, D. and Poleski, R. and Kozłowski, S. and Mróz, P. and Ulaczyk, K. and Rybicki, K. and Iwanek, P. and Gromadzki, M. (2019) Over 78 000 RR Lyrae Stars in the Galactic Bulge and Disk from the OGLE Survey. Acta Astronomica, 69 (4). pp. 321-337. ISSN 0001-5237.

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We present an upgrade of the OGLE Collection of RR Lyrae stars in the Galactic bulge and disk. The size of our sample has been doubled and reached 78 350 RR Lyr variables, of which 56 508 are fundamental-mode pulsators (RRab stars), 21 321 pulsate solely in the first-overtone (RRc stars), 458 are classical double-mode pulsators (RRd stars), and 63 are anomalous RRd variables (including six triple-mode pulsators). For all the newly identified RR Lyr stars, we publish time-series photometry obtained during the OGLE Galaxy Variability Survey. We present the spatial distribution of RR Lyr stars on the sky, provide a list of globular clusters hosting RR Lyr variables, and discuss the Petersen diagram for multimode pulsators. We find new RRd stars belonging to a compact group in the Petersen diagram (with period ratios P₁₀/P_F ≈ 0.74 and fundamental-mode periods P_F ≈ 0.44 d) and we show that their spatial distribution is roughly spherically symmetrical around the Milky Way center.

Item Type:Article
Related URLs:
URLURL TypeDescription
Udalski, A.0000-0001-5207-5619
Pietrukowicz, P.0000-0002-2339-5899
Skowron, J.0000-0002-2335-1730
Poleski, R.0000-0002-9245-6368
Mróz, P.0000-0001-7016-1692
Ulaczyk, K.0000-0001-6364-408X
Iwanek, P.0000-0002-6212-7221
Gromadzki, M.0000-0002-1650-1518
Additional Information:© 2019 Copernicus Foundation for Polish Astronomy. Received December 9, 2019. We would like to thankM. Kubiak, G. Pietrzy´nski, Ł.Wyrzykowski and M. Pawlak for their contribution to the collection of the OGLE photometric data presented in this paper. We thank Z. Kołaczkowski and A. Schwarzenberg-Czerny for providing software used in this study. This work has been supported by the National Science Centre, Poland, grant MAESTRO no. 2016/22/A/ST9/00009. The OGLE project has received funding from the Polish National Science Centre grant MAESTRO 2014/14/A/ST9/00121. This research hasmade use of the InternationalVariable Star Index (VSX) database, operated at AAVSO, Cambridge, Massachusetts, USA.
Funding AgencyGrant Number
National Science Centre (Poland)MAESTRO 2016/22/A/ST9/00009
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
Subject Keywords:Stars: variables: RR Lyrae – Stars: oscillations – Galaxy: bulge – Galaxy: disk – Catalogs
Issue or Number:4
Record Number:CaltechAUTHORS:20200220-153616280
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101436
Deposited By: Tony Diaz
Deposited On:20 Feb 2020 23:52
Last Modified:09 Mar 2020 13:19

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