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Query : 2012MNRAS.423..406G |
2012MNRAS.423..406G - Mon. Not. R. Astron. Soc., 423, 406-421 (2012/June-2)
Auto-consistent metallicity and star formation history of the nearest blue compact dwarf galaxy NGC 6789.
GARCIA-BENITO R. and PEREZ-MONTERO E.
Abstract (from CDS):
We used archival Hubble Space Telescope/Wide-Field Planetary Camera 2 (HST/WFPC2) F555W and F814W observations of NGC 6789 to perform a photometric study of the colour-magnitude diagram (CMD) of the resolved stellar populations and derive its star formation history (SFH), which is compatible with the presence of different young and old stellar populations whose metallicities do not necessarily increase with age. We fit the observed optical spectrum in all the five knots using the STARLIGHT code and a combination of single stellar populations following the SFH obtained from the CMD. We compare the resulting stellar masses and the relative fractions of the ionizing populations with a non-constrained SFH case. The properties of the younger populations were obtained using CLOUDY photoionization models, giving similar ages in all the knots in the range 3-6 Myr and the estimation of the dust absorption factor, which correlates with the observed GALEX far-ultraviolet-near-ultraviolet colour indices. The total photometric extinction and dust-absorption corrected Hα fluxes were finally used to derive the star formation rates.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): Hertzsprung-Russell and colour-magnitude diagrams - ISM: abundances - galaxies: dwarf - galaxies: individual: NGC 6789 - galaxies: starburst - galaxies: star formation
Simbad objects: 6
Number of rows : 6 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | M 33 | GiG | 01 33 50.8965749232 | +30 39 36.630403128 | 6.17 | 6.27 | 5.72 | ~ | 5838 | 1 | ||
2 | NGC 604 | HII | 01 34 32.1 | +30 47 01 | ~ | 586 | 0 | |||||
3 | M 101 | GiP | 14 03 12.583 | +54 20 55.50 | 8.46 | 7.86 | 7.76 | ~ | 2914 | 2 | ||
4 | NGC 5471 | EmG | 14 04 28.627 | +54 23 52.84 | ~ | 240 | 1 | |||||
5 | NGC 6789 | AG? | 19 16 41.169 | +63 58 23.90 | 13.76 | ~ | 113 | 1 | ||||
6 | BD+25 4655 | HS* | 21 59 41.9748629928 | +26 25 57.403455672 | 8.27 | 9.39 | 9.68 | sdO6 | 118 | 0 |
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