Candidates for non-pulsating stars located in the Cepheid instability strip in the Large Magellanic Cloud based on Strömgren photometry. Issue 3 (1st August 2019)

• Record Type: Journal Article
• Authors: Narloch, Weronika; Pietrzyński, G; Kołaczkowski, Z; Smolec, R; Górski, M; Kubiak, M; Udalski, A; Soszyński, I; Graczyk, D; Gieren, W; Karczmarek, P; Zgirski, B; Wielgórski, P; Suchomska, K; Pilecki, B; Taormina, M; Kałuszyński, M
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 489:Issue 3(2019)
• Page Start: 3285
• Page End: 3293
• Publication Date: 2019-08-01
• Subjects: stars: variables: Cepheids -- galaxies: individual: Large Magellanic Cloud; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz2112
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present candidates for non-pulsating stars lying in the classical Cepheid instability strip based on the Optical Gravitational Lensing Experiment (OGLE) photometric maps combined with Strömgren photometry obtained with the 4.1-m Southern Astrophysical Research (SOAR) telescope, and Gaia Data Release 2 data in four fields in the Large Magellanic Cloud. We selected 19 candidates in total. After analysis of their light curves from OGLE surveys we found that all these stars appear to be photometrically stable at the level of a few mmag. Our results show that non-pulsating stars might constitute to about $21\!-\!30\, {\rm per\, cent}$ of the whole sample of giant stars located in the classical instability strip. Furthermore, we identified potential candidates for classical Cepheids with hot companions based on their Strömgren colours.