Query : 2019A&A...627A...7S

2019A&A...627A...7S - Astronomy and Astrophysics, volume 627A, 7-7 (2019/7-1)

Star clusters in the dwarf irregular galaxy Leo A.


Abstract (from CDS):

Context. Leo A is an isolated gas-rich dwarf irregular galaxy of low stellar mass and metallicity residing at the outskirts of the Local Group. Ages of the stellar populations in Leo A range from ∼10Myr to ∼10Gyr. So far, only one star cluster has been discovered in this galaxy. Aims. Our aim is to search for star cluster candidates in the Leo A galaxy. Methods. We performed photometry of star-like objects on HST ACS archive observation frames in the F475W and F814W passbands and studied the spatial clustering of the Leo A stars down to the turn-off point of the old stellar populations. Results. We report the discovery of four star clusters in the Leo A galaxy. This means that now a sample of five star clusters is known in Leo A. Two clusters are of a young age (∼20Myr; overlapping with HII regions) and low in mass (≥400M and ≥150M), the other three clusters are older (≥100Myr) and also of low mass (≥300M). These rough estimates are made assuming the isochrones of a metallicity derived for HII regions (Z=0.0007). Colour-magnitude diagrams of the stars residing in the circular areas of a 2.5'' radius around the clusters and integrated aperture photometry results of the clusters are presented.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: dwarf - galaxies: star clusters: general - galaxies: individual: Leo A (DDO 69)

Status at CDS : Examining the need for a new acronym.

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Leo A-C1 Cl* 09 59 16.513 +30 44 58.43           ~ 2 0
2 NAME Leo A G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 597 0
3 NAME Local Group GrG ~ ~           ~ 8153 0

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