Comparison of multi-band period-luminosity relations for classical Cepheids in the Magellanic Clouds

11th Pacific Rim Conference on Stellar Astrophysics: Physics and Chemistry of the Late Stages of Stellar Evolution

物理学;天文学

Ngeow, Chow-Choong^1 ; Kanbur, Shashi M.^2

Graduate Institute of Astronomy, National Central University, Jhongli

32001, Taiwan^1

Department of Physics, SUNY Oswego, Oswego

NY

13126, United States^2

关键词: Distance scale;    Distance-based;    Eclipsing binaries;    Fundamental modes;    Magellanic Clouds;    Multi band;    Period-luminosity relations;    Small magellanic clouds;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/7/072024/pdf
DOI  :  10.1088/1742-6596/728/7/072024

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The period-luminosity (PL) relation for classical fundamental mode Cepheids (hereafter Cepheids) is an important astrophysical tool in distance scale applications. Because of this, we initiated a program to derive multi-band PL relations with Cepheids in the Large and Small Magellanic Cloud (hereafter LMC and SMC, respectively), as there are ∼ 103Cepheids found in these two nearby galaxies. When compared the slopes of the multi-band PL relations for Cepheids in the LMC and SMC, we found that these PL slopes agree with each others except in the V and J band. We also found an excellent agreement of the PL slopes in Wesenheit function, hence we calibrated the Period-Wesenheit (PW) relation by combining the data from both Clouds, together with an accurate LMC distance based on measurement from late-type eclipsing binaries. Our calibrated Wesenheit function is MW= - 3.314 log(P) - 2.601.