Over 78 000 RR Lyrae Stars in the Galactic Bulge and Disk from the OGLE Survey
Abstract
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.
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.Attached Files
Published - pap_69_4_2.pdf
Files
Name | Size | Download all |
---|---|---|
md5:8f7fcbb9fd79e8c77ed1d2c1903851b5
|
2.0 MB | Preview Download |
Additional details
- Eprint ID
- 101436
- Resolver ID
- CaltechAUTHORS:20200220-153616280
- MAESTRO 2016/22/A/ST9/00009
- National Science Centre (Poland)
- MAESTRO 2014/14/A/ST9/00121
- National Science Centre (Poland)
- Created
-
2020-02-20Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field