Asymptotic giant branch stars in NGC 6822: Probes of star formation history

Bibcode
1994ApJ...425L...9G
DOI
10.1086/187298
Gallart, C.; Aparicio, A.; Chiosi, C.; Bertelli, G.; Vilchez, J. M.
Bibliographical reference

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 425, no. 1, p. L9-L12

Advertised on:
4
1994
Journal
Astrophysical Journal
Number of authors
5
IAC number of authors
3
Citations
33
Refereed citations
25
Description
About 500 asymptotic giant branch (AGB) stars have been resolved and photometrically measured in the Local Group (LG) dwarf irregular galaxy NGC 6822. They draw an AGB well shaped, densely populated, and extending to very red colors. It is the first time that this kind of AGB has been clearly detected. Using recent stellar evolutionary models and isochrones, we discuss the stellar population of the galaxy, showing, in particular, how the structure of the AGB can be used as an observable to trace the intermediate-age and old star formation history of the galaxy. The powerful telescopes and detectors currently available offer the opportunity of detecting this structure in other nearby galaxies. This opens new paths for the study of the intermediate-age and old populations of the LG.
Type
Refereed
Cosmology
Dwarf galaxies
Irregular galaxies
Stellar composition
Stellar evolution
Photometry

It may interest you

  • Refereed
    Characterisation at Cryogenic Temperatures of an Attenuator for an Application of Astrophysical Instrumentation with MKIDs
    The use of non-cryogenic certified commercial electronics for cryogenic applications may be attractive due to their cost and availability, but it also carries risks related to reliability, performance and thermal compatibility. The decision to use commercial components that are not certified for cryogenics instead of components specifically
    Rodríguez Ramos L.F. et al.

    Advertised on:

    12
    2024
  • Refereed
    The return of FarNet-II: Generation of solar far-side magnetograms from helioseismic data
    Context. The far-side activity of the Sun can be inferred by interpreting the near-side wave field using local helioseismic techniques. However, detections are limited to strongly active regions because signal-to-noise ratio of the data is low. Recently, we developed the FarNet and FarNet-II neural networks to improve the identification of active
    Broock, E. G. et al.

    Advertised on:

    12
    2024
    Bibcode
    2024A&A...692A.182B
    Citations
    0
  • Refereed
    Non-local thermodynamic equilibrium inversions of the Si I 10827 Å spectral line
    Inferring the coupling of different atmospheric layers requires observing spectral lines sensitive to the atmospheric parameters, particularly the magnetic field vector, at various heights. The best way to tackle this goal is to perform multi-line observations simultaneously. For instance, the new version of the Gregor Infrared Spectrograph
    Quintero Noda, C. et al.

    Advertised on:

    12
    2024
    Bibcode
    2024A&A...692A.169Q
    Citations
    0