Artykuł w czasopiśmie
Brak miniatury
Licencja
 

Three-Dimensional Distributions of Type II Cepheids and Anomalous Cepheids in the Magellanic Clouds. Do these Stars Belong to the Old, Young or Intermediate-Age Population?

Uproszczony widok
dc.abstract.enThe nature of type II Cepheids and anomalous Cepheids is still not well known and their evolutionary channels leave many unanswered questions. We use complete collection of classical pulsating stars in the Magellanic Clouds discovered by the OGLE project, to compare their spatial distributions, which are one of the characteristic features directly related to the star formation history. In this analysis we use 9649 classical Cepheids, 262 anomalous Cepheids, 338 type II Cepheids and 46 443 RR Lyr stars from both Magellanic Clouds. We compute three-dimensional Kolmogorov-Smirnov tests for every possible pair of type II and anomalous Cepheids with classical Cepheids, and RR Lyr stars. We confirm that BL Her stars are as old as RR Lyr variable stars - their spatial distributions are similar, and they create a vast halo around both galaxies. We discover that spatial distribution of W Vir stars has attributes characteristic for both young and old stellar populations. Hence, it seems that these similarities are related to the concentration of these stars in the center of the Large Magellanic Cloud, and the lack of a vast halo. This leads to the conclusion that W Vir variables could be a mixture of old and intermediate-age stars. Our analysis of the three-dimensional distributions of anomalous Cepheids shows that they differ significantly from classical Cepheids. Statistical tests of anomalous Cepheids distributions with RR Lyr distributions do not give unambiguous results. We consider that these two distributions can be similar through the vast halos they create. This similarity would confirm anomalous Cepheids evolution scenario that assumes coalescence of a binary system.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorIwanek, Patryk
dc.contributor.authorSoszyński, Igor
dc.contributor.authorSkowron, Dorota
dc.contributor.authorSkowron, Jan
dc.contributor.authorMróz, Przemysław
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorSzymański, Michał
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorPoleski, Radosław
dc.contributor.authorJacyszyn-Dobrzeniecka, Anna
dc.date.accessioned2024-01-26T10:52:16Z
dc.date.available2024-01-26T10:52:16Z
dc.date.copyright2018-09-05
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number3
dc.description.versionORIGINAL_AUTHOR
dc.description.volume68
dc.identifier.doi10.32023/0001-5237/68.3.3
dc.identifier.issn0001-5237
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123357
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018AcA....68..213I
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofActa Astronomica
dc.relation.pages213-236
dc.rightsOther
dc.sciencecloudnosend
dc.titleThree-Dimensional Distributions of Type II Cepheids and Anomalous Cepheids in the Magellanic Clouds. Do these Stars Belong to the Old, Young or Intermediate-Age Population?
dc.typeJournalArticle
dspace.entity.typePublication