Over 10 000 δ Scuti Stars toward the Galactic Bulge from OGLE-IV
Abstract
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.
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).Attached Files
Published - pap_70_4_1.pdf
Accepted Version - 2103.10436.pdf
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Additional details
- Alternative title
- Over 10 000 Delta Scuti Stars toward the Galactic Bulge from OGLE-IV
- Eprint ID
- 108508
- Resolver ID
- CaltechAUTHORS:20210322-105042906
- 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
- National Science Centre (Poland)
- 0192/DIA/2016/45
- Ministerstwo Nauki i Szkolnictwa Wyższego
- Foundation for Polish Science
- Created
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2021-03-24Created from EPrint's datestamp field
- Updated
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2021-03-24Created from EPrint's last_modified field