2008A&A...483L...5G


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.07CEST13:25:54

2008A&A...483L...5G - Astronomy and Astrophysics, volume 483, L5-8 (2008/5-3)

Resolving stellar populations outside the Local Group: MAD observations of UKS2323-326.

GULLIEUSZIK M., GREGGIO L., HELD E.V., MORETTI A., ARCIDIACONO C., BAGNARA P., BARUFFOLO A., DIOLAITI E., FALOMO R., FARINATO J., LOMBINI M., RAGAZZONI R., BRAST R., DONALDSON R., KOLB J., MARCHETTI E. and TORDO S.

Abstract (from CDS):

We present a study aimed at deriving constraints on star formation at intermediate ages from the evolved stellar populations in the dwarf irregular galaxy UKS2323-326. These observations were also intended to demonstrate the scientific capabilities of the multi-conjugated adaptive optics demonstrator (MAD) implemented at the ESO Very Large Telescope as a test-bench of adaptive optics (AO) techniques. We perform accurate, deep photometry of the field using J and Ks band AO images of the central region of the galaxy. The near-infrared (IR) colour-magnitude diagrams clearly show the sequences of asymptotic giant branch (AGB) stars, red supergiants, and red giant branch (RGB) stars down to ∼1mag below the RGB tip. Optical-near-IR diagrams, obtained by combining our data with Hubble Space Telescope observations, provide the best separation of stars in the various evolutionary stages. The counts of AGB stars brighter than the RGB tip allow us to estimate the star formation at intermediate ages. Assuming a Salpeter initial mass function, we find that the star formation episode at intermediate ages produced ∼6x105M of stars in the observed region.

Abstract Copyright:

Journal keyword(s): galaxies: individual: UKS2323-326 - galaxies: stellar content - stars: AGB and post-AGB - stars: carbon - instrumentation: adaptive optics - galaxies: individual: UGCA438

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 463 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14871 1
3 ESO 407-18 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 143 0
4 NAME Local Group GrG ~ ~           ~ 7000 0

    Equat.    Gal    SGal    Ecl

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2020.08.07-13:25:54

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