| Abstract [eng] |
In this study we present new PHAT survey star cluster photometry catalogue of the Andromeda galaxy. For each cluster we measured: centre coordinates, colour and total apertures, background levels and magnitudes for 6 photometric passbands. Using Naujalis et al. (2020) star cluster catalogue (N), we analyse distribution of stellar populations in the galactic disk. Main objective: to perform new photometry for M31 PHAT survey star clusters and determine parameter distributions in the galactic disk. Main tasks: 1. Measure centre coordinates, apertures and background levels for star clusters. 2. Perform multicolour aperture photometry for star clusters and prepare catalogue. 3. Analyse stellar population parameter changes in the Andromeda galaxy disk. Conclusions 1. We measured new centre coordinates for 90% (1317/1471) of star clusters; background levels and apertures were determined for all (1471) clusters. 2. By performing multicolour aperture photometry for 1471 objects, and adding results to N catalogue, we prepared new photometry catalogue for star clusters in the Andromeda galaxy. 3. Young (<10 Myr) stellar population distribution reveals that Andromeda galaxy have two star forming rings. Radial distance from the galaxy centre and width for the first ring is 10.2–13.3 kpc, second 15.2–17.8 kpc. 4. Stellar populations over 50 Myr have ~0.5 kpc radial shift in 10 kpc star forming ring of the Andromeda galaxy. 5. 10 kpc star forming ring of the Andromeda galaxy have two regions of increased star formation rate. Azimuths of these regions are: 0–45° and 105–135°. |
