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

Дата и время публикации : 2013-11-22T21:00:08Z

Авторы публикации и институты :
P. Pietrukowicz (Warsaw Univ. Observatory)
W. A. Dziembowski (Warsaw Univ. Observatory)
P. Mroz (Warsaw Univ. Observatory)
I. Soszynski (Warsaw Univ. Observatory)
A. Udalski (Warsaw Univ. Observatory)
R. Poleski (Warsaw Univ. Observatory)
M. K. Szymanski (Warsaw Univ. Observatory)
M. Kubiak (Warsaw Univ. Observatory)
G. Pietrzynski (Warsaw Univ. Observatory)
L. Wyrzykowski (Warsaw Univ. Observatory)
K. Ulaczyk (Warsaw Univ. Observatory)
S. Kozlowski (Warsaw Univ. Observatory)
J. Skowron (Warsaw Univ. Observatory)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 22 pages, 12 figures, submitted to Acta Astronomica
Первичная категория: astro-ph.GA

Все категории : astro-ph.GA, astro-ph.SR

Краткий обзор статьи: We present the results of a search for pulsating stars in the 7.12 deg^2 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, 14 Long-Period Variables, such as Miras and Semi-Regular Variables, and 56 very likely delta Sct type stars. Based on asteroseismic models constructed for one quadruple-mode and six triple-mode delta 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. All reported pulsating variables 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 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.

Category: Physics