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Frequency analysis of δ Scuti stars towards the Galactic bulge

Netzel, Henryka and Pietrukowicz, P. and Soszyński, I. and Wrona, M. (2022) Frequency analysis of δ Scuti stars towards the Galactic bulge. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 510 (2). pp. 1748-1764. ISSN 0035-8711

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Abstract

We have performed a frequency analysis of 10 092 δ Scuti-type stars detected in the fourth phase of the Optical Gravitational Lensing Experiment towards the Galactic bulge, which is the most numerous homogeneous sample of δ Scuti stars observed so far. The main goal was to search for stars pulsating in at least two radial modes simultaneously. We have found 3083 candidates for such stars, which is the largest set obtained to date. Among them, 2655 stars pulsate in two radial modes, 414 stars pulsate in three radial modes, and 14 stars pulsate in four radial modes at the same time. We report the identification of 221 δ Scuti stars pulsating in the fundamental mode, first overtone, and third overtone simultaneously. We show the most populated Petersen and Bailey diagrams and discuss statistical properties of the identified frequencies based on this numerous sample. Additionally, we present theoretical predictions of period ratios for δ Scuti stars pulsating in overtones from the fourth to the seventh.

Item Type: Article
Uncontrolled Keywords: Astrophysics - Solar and Stellar Astrophysics; stars: oscillations (including pulsations); stars: variable: δ Scuti;
Subjects: Q Science / természettudomány > QB Astronomy, Astrophysics / csillagászat, asztrofizika
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 04 Nov 2022 13:25
Last Modified: 04 Nov 2022 13:25
URI: http://real.mtak.hu/id/eprint/152919

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