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We present the results of a search for pulsating stars in the 7.12 deg2 OGLE-III Galactic disk area in the direction tangent to the Centaurus Arm. We report the identification of 20 Classical Cepheids, 45 RR Lyr type stars, 31 Long-Period Variables, such as Miras and Semi-Regular Variables, one pulsating white dwarf, and 58 very likely δ Sct type stars. Based on asteroseismic models constructed for one quadruple-mode and six triple-mode δ Sct type pulsators, we estimated masses, metallicities, ages, and distance moduli to these objects. The modeled stars have masses in the range 0.9-2.5 MSun and are located at distances between 2.5 kpc and 6.2 kpc. Two triple-mode and one double-mode pulsators seem to be Population II stars of the SX Phe type, probably from the Galactic halo. Our sample also includes candidates for Type II Cepheids and unclassified short-period (P<0.23 d) multi-mode stars which could be either δ Sct or β Cep type stars. One of the detected variables is a very likely δ Sct star with an exceptionally high peak-to-peak I-band amplitude of 0.35 mag at the very short period of 0.0196 d. All reported pulsating variable stars but one object are new discoveries. They are included in the OGLE-III Catalog of Variable Stars. Finally, we introduce the on-going OGLE-IV Galactic Disk Survey, which covers more than half of the Galactic plane. For the purposes of future works on the spiral structure and star formation history of the Milky Way, we have already compiled a list of known Galactic Classical Cepheids.
Czasopismo
Rocznik
Tom
Strony
379--404
Opis fizyczny
Bibliogr.88 poz., tab., wykr.
Twórcy
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Universidad de Concepción, Departamento de Astronomia, Casilla 160-C, Concepción, Chile
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-6477ddaa-5a83-429b-90d1-8414ce3e9065