The HST Key Project galaxies NGC 1326A, NGC 1425, and NGC 4548: New variable stars and massive star population

0517149 - ASÚ 2020 RIV FR eng J - Journal Article
Spetsieri, Z. T. - Bonanos, A. Z. - Yang, M. - Kourniotis, Michail - Hatzidimitriou, D.
The HST Key Project galaxies NGC 1326A, NGC 1425, and NGC 4548: New variable stars and massive star population.
Astronomy & Astrophysics. Roč. 629, August (2019), č. článku A3. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : galaxies * stars * supergiants
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.636, year: 2019
Method of publishing: Open access

We present the analysis of the massive star population of the galaxies NGC 1326A, NGC 1425, and NGC 4548 using archival images obtained with the Hubble Space Telescope Wide Field Planetary Camera 2 in the F555W and F814W filters. Through high-precision point spread function fitting photometry for all sources in the three fields, we identified 7640 candidate blue supergiants, 2314 candidate yellow supergiants, and 4270 candidate red supergiants. We provide an estimate of the ratio of blue to red supergiants for each field as a function of galactocentric radius. Using Modules for Experiments in Stellar Astrophysics (MESA) at solar metallicity, we defined the luminosity function and estimated the star formation history of each galaxy.
Permanent Link: http://hdl.handle.net/11104/0302437