Stellar evolution in the outer Galaxy

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

物理学;天文学

Szczerba, Ryszard^1 ; Siódmiak, Natasza^1 ; Leniewska, Aleksandra^2 ; Karska, Agata^2 ; Sewilo, Marta^3,4

N. Copernicus Astronomical Center, PAS, Rabiaska 8, Toru

87-100, Poland^1

Astronomical Observatory, Adam Mickiewicz University, Sloneczna 36, Pozna

60-268, Poland^2

NASA Goddard Space Flight Center, 8800 Greenbelt Rd., Greenbelt

MD

20771, United States^3

Astronomical Observatory, Jagiellonian University, Orla 171, Kraków

30-244, Poland^4

关键词: Color-color diagrams;    Different class;    Follow-up Studies;    Near infra red;    Spitzer space telescope;    Star formations;    Stellar evolutions;    Young stellar objects;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/4/042004/pdf
DOI  :  10.1088/1742-6596/728/4/042004

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We investigate the distribution of different classes of spectroscopically identified sources and theoretical models in the color-color diagrams (CCDs) combining the near-infrared (NIR) and mid-infrared (MIR) data to develop a method to classify Outer Galaxy sources detected with the Spitzer Space Telescope (hereafter Spitzer) SMOG survey in the IRAC 3.68.0 μm and MIPS 24 μm bands. We supplement the Spitzer data with the data from other satellite and ground-based surveys. The main goal of our study is to discover and characterize the population of intermediate- and low-mass young stellar objects (YSOs) in the Outer Galaxy and use it to study star formation in a significantly different environment than the Galaxy inside the solar circle. Since the YSOs can be confused with evolved stars in the MIR, these classes of objects need to be carefully separated. Here we present the initial results of our analysis using the Ks-[8.0] vs. Ks-[24] CCD as an example. The evolved stars separated from YSOs in the YSO selection process will be investigated in detail in the follow-up study.