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Over 10 000 δ Scuti Stars toward the Galactic Bulge from OGLE-IV

Pietrukowicz, P. and Soszyński, I. and Netzel, H. and Wrona, M. and Udalski, A. and Szymanski, M. K. and Poleski, R. and Kozłowski, S. and Skowron, J. and Ulaczyk, K. and Skowron, D. M. and Mróz, P. and Rybicki, K. and Iwanek, P. and Gromadzki, M. (2020) Over 10 000 δ Scuti Stars toward the Galactic Bulge from OGLE-IV. Acta Astronomica, 70 (4). pp. 241-263. ISSN 0001-5237. doi:10.32023/0001-5237/70.4.1.

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We present a collection of 10 111 genuine δ Sct-type pulsating variable stars detected in the OGLE-IV Galactic bulge fields. In this sample, 9835 variables are new discoveries. For most of the stars photometric data cover the whole decade 2010-2019. We illustrate a huge variety of light curve shapes of δ Sct variables. Long-term observations have allowed us to spot objects with evident period, amplitude, and mean brightness variations. Our analysis indicates that about 28% of the stars are single-mode pulsators. Fourteen δ Sct stars show additional eclipsing or ellipsoidal binary modulation. We report significant attenuation or even disappearance of the pulsation signal in six sources. The whole set of variables is a mix of objects representing various Milky Way's populations, with the majority of stars from the Galactic bulge. There are also representatives of the Sagittarius Dwarf Spheroidal Galaxy. Some of the newly detected variables could be SX Phe-type stars residing in globular clusters. The collection, including full V- and I-band time-series data, is available to the astronomical community from the OGLE On-line Data Archive.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Pietrukowicz, P.0000-0002-2339-5899
Soszyński, I.0000-0002-7777-0842
Wrona, M.0000-0002-3051-274X
Udalski, A.0000-0001-5207-5619
Szymanski, M. K.0000-0002-0548-8995
Poleski, R.0000-0002-9245-6368
Kozłowski, S.0000-0003-4084-880X
Skowron, J.0000-0002-2335-1730
Ulaczyk, K.0000-0001-6364-408X
Skowron, D. M.0000-0001-9439-604X
Mróz, P.0000-0001-7016-1692
Rybicki, K.0000-0002-9326-9329
Iwanek, P.0000-0002-6212-7221
Gromadzki, M.0000-0002-1650-1518
Alternate Title:Over 10 000 Delta Scuti Stars toward the Galactic Bulge from OGLE-IV
Additional Information:© 2020 Copernicus Foundation for Polish Astronomy. Received: December 28, 2020. Based on observations obtained with the 1.3-mWarsaw telescope at the Las Campanas Observatory operated by the Carnegie Institution for Science. We thank OGLE observers for their contribution to the collection of the photometric data over the years. The OGLE project has received funding from the National Science Centre, Poland, through grant number MAESTRO 2014/14/A/ST9/00121 to AU. This work has also been supported by the National Science Centre, Poland, grants OPUS 2016/23/B/ST9/00655 to PP and MAESTRO 2016/22/A/ST9/00009 to IS. HN acknowledges support from the Polish Ministry of Science and Higher Education under grant 0192/DIA/2016/45 within the Diamond Grant Programme for years 2016-2021 and Foundation for Polish Science (FNP).
Funding AgencyGrant Number
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
National Science Centre (Poland)OPUS 2016/23/B/ST9/00655
National Science Centre (Poland)MAESTRO 2016/22/A/ST9/00009
Ministerstwo Nauki i Szkolnictwa Wyższego0192/DIA/2016/45
Foundation for Polish ScienceUNSPECIFIED
Subject Keywords:Catalogs - Stars: variables: delta Scuti - Galaxy: bulge - Galaxies: individual: Sagittarius Dwarf Spheroidal Galaxy
Issue or Number:4
Record Number:CaltechAUTHORS:20210322-105042906
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108508
Deposited By: Tony Diaz
Deposited On:24 Mar 2021 19:56
Last Modified:24 Mar 2021 19:56

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