Large Variety of New Pulsating Stars in the OGLE-III Galactic Disk Fields

• Autorzy: Pietrukowicz P. , Dziembowski W. A. , Mróz P. , Soszyński I. , Udalski A. , Poleski R. , Szymański M. K. , Kubiak M. , Pietrzyński G. , Wyrzykowski Ł. , Ulaczyk K. , Kozłowski S. , Skowron J.
• Języki publikacji: EN

Abstrakty

EN

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 M_Sun 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.

Słowa kluczowe

EN

galaxy: disk; stars: variables: Cepheids; stars: variables: delta Scuti; stars: variables: RR Lyrae; stars: variables: general

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2013
• Tom: Vol. 63, No. 4
• Strony: 379--404
• Opis fizyczny: Bibliogr.88 poz., tab., wykr.

Twórcy

autor

Pietrukowicz P.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Dziembowski W. A.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Mróz P.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Soszyński I.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Udalski A.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Poleski R.

• 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

Szymański M. K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Kubiak M.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Pietrzyński G.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• Universidad de Concepción, Departamento de Astronomia, Casilla 160-C, Concepción, Chile

autor

Wyrzykowski Ł.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK

autor

Ulaczyk K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Kozłowski S.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Skowron J.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

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