Near IR observations of η Car: Reaching its critical rotation?

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

物理学;天文学

Ishibashi, Kazunori^1 ; Mehner, Andrea^2 ; Nagayama, Takahiro^3

Graduate School of Science, Nagoya University, Japan^1

ESO European Organisation for Astronomical Research in the Southern Hemisphere, Chile^2

Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, Japan^3

关键词: Black body;    Cyclic variations;    Eta Carinae;    Near-IR;    Photometric data;    South african astronomical observatories;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/7/072007/pdf
DOI  :  10.1088/1742-6596/728/7/072007

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We report a preliminary result in the monitoring of η Carinae in JHKs bands through the "spectroscopic" event of 2014.5 at InfraRed Survey Facility (IRSF) located in South African Astronomical Observatory (SAAO). The latest photometric data, combined with the data taken with the MK-II photometer [1], show a sign of the same cyclic variation in the J-H vs. H-K diagram reported by Mehner et al.[2]. The change can still be attributed to an apparent increase in black-body temperature, potentially reaching 3,000 to 6,000K as of March 2015.