Monitoring pulsating giant stars in M33: star formation history and chemical enrichment

Frontiers in Theoretical and Applied Physics/UAE 2017

Javadi, A.^1 ; Van Loon, J Th^2

School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Tehran

19395-5531, Iran^1

Lennard-Jones Laboratories, Keele University, ST5 5BG, United Kingdom^2

关键词: Dust production;    Infrared telescopes;    Long period variables;    Monitoring surveys;    Spiral galaxies;    Spitzer space telescope;    Star formation rates;    Star formations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/869/1/012062/pdf
DOI  :  10.1088/1742-6596/869/1/012062

来源: IOP

【 摘 要 】

We have conducted a near-infrared monitoring campaign at the UK InfraRed Telescope (UKIRT), of the Local Group spiral galaxy M33 (Triangulum). A new method has been developed by us to use pulsating giant stars to reconstruct the star formation history of galaxies over cosmological time as well as using them to map the dust production across their host galaxies. In first Instance the central square kiloparsec of M33 was monitored and long period variable stars (LPVs) were identified. We give evidence of two epochs of a star formation rate enhanced by a factor of a few. These stars are also important dust factories, we measure their dust production rates from a combination of our data with Spitzer Space Telescope mid-IR photometry. Then the monitoring survey was expanded to cover a much larger part of M33 including spiral arms. Here we present our methodology and describe results for the central square kiloparsec of M33 [1-4] and disc of M33 [5-8].