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Query : 2009AJ....137.3172B |
2009AJ....137.3172B - Astron. J., 137, 3172-3180 (2009/February-0)
The WFC3 Galactic bulge treasury program: a first look at resolved stellar population tools.
BROWN T.M., SAHU K., ZOCCALI M., RENZINI A., FERGUSON H.C., ANDERSON J., SMITH E., BOND H.E., MINNITI D., VALENTI J.A., CASERTANO S., LIVIO M., PANAGIA N., VANDENBERG D.A. and VALENTI E.
Abstract (from CDS):
The observing strategy is based upon a new photometric system employing five WFC3 bands spanning the UV, optical, and near-infrared: F390W, F555W, F814W, F110W, and F160W (analogous but not identical to the ground-based filters Washington C, V, I, J, and H). With these bands, one can construct reddening-free indices of temperature and metallicity. Using this photometric system, the program will target six fields in well studied star clusters, spanning a wide range of metallicity, and four fields in low-extinction windows of the Galactic bulge. The cluster data serve to calibrate the reddening-free indices, provide empirical population templates, and correct the transformation of theoretical isochrone libraries into the WFC3 photometric system. The bulge data will shed light on the bulge formation history, and will also serve as empirical population templates for other studies. One of the fields includes 12 candidate hosts of extrasolar planets.
Color-magnitude diagrams (CMDs) are the most popular tool for analyzing resolved stellar populations. However, due to degeneracies among temperature, metallicity, and reddening in traditional CMDs, it can be difficult to draw robust conclusions from the data. The five-band system used for the bulge Treasury observations will provide reddening-free indices that are roughly orthogonal in temperature and metallicity, and we argue that model fitting in an index-index diagram will make better use of the information than fitting separate CMDs. We provide some results from simulations to show the expected quality of the data and their potential for differentiating between different star formation histories.
Abstract Copyright: ∼
Journal keyword(s): Galaxy: bulge - Galaxy: formation - Galaxy: stellar content - globular clusters: individual (M92, NGC 6752, 47 Tuc, NGC 5927, NGC 6528, NGC 6791) - stars: low-mass, brown dwarfs - techniques: photometric
Simbad objects: 10
Number of rows : 10 |
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 | NGC 104 | GlC | 00 24 05.359 | -72 04 53.20 | 4.09 | ~ | 3917 | 0 | ||||
2 | M 31 | AGN | 00 42 44.330 | +41 16 07.50 | 4.86 | 4.36 | 3.44 | ~ | 12651 | 1 | ||
3 | NGC 5927 | GlC | 15 28 00.69 | -50 40 22.9 | ~ | 462 | 0 | |||||
4 | M 92 | GlC | 17 17 07.39 | +43 08 09.4 | 6.52 | ~ | 2116 | 0 | ||||
5 | NAME Stanek Window | reg | 17 54.7 | -29 49 | ~ | 10 | 0 | |||||
6 | NAME Baade Window | reg | 18 03.5 | -30 01 | ~ | 613 | 3 | |||||
7 | NGC 6528 | GlC | 18 04 49.61 | -30 03 20.8 | 12.12 | 10.65 | ~ | 524 | 0 | |||
8 | NGC 6752 | GlC | 19 10 52.11 | -59 59 04.4 | ~ | 2001 | 0 | |||||
9 | NGC 6791 | OpC | 19 20 53.0 | +37 46 41 | 10.52 | 9.5 | ~ | 1040 | 0 | |||
10 | NAME Galactic Bulge | reg | ~ | ~ | ~ | 4299 | 0 |
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