Assigned ID: 690
----- Attempting Submission 1 (Fri Feb 26 22:21:14 GMT 2010) -----
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----- Attempting Submission 1 (Fri Jul 09 06:59:30 GMT 2010) -----
The Hot Stellar Content and HB morphology of the massive globular cluster G1
We propose to obtain deep WFC3 imagery of the Local Group's most luminous globular cluster, G1. Our primary aim is to define the hot stellar content and the extent of what appears to be a multimodal horizontal branch, analogous to those known in Omega Cen and NGC 2808. G1 is 40 kpc distant in the M31, and it would have been highly unlikely that collision with a giant molecular clould would be responsible for the complex populations which must therefore be the result of self-enrichment. We will obtain data very similar to those obtained for the known Galactic multimodal globular clusters NGC 6388 and 6441, and compare the stellar distribution on the horizontal branch with models. We can constrain the fraction of helium-enriched stars, if present, and search for supra-horizontal branch and other anomalous hot, evolved, stars. Parallel ACS observations will be the deepest ever obtained in the adjacnt field to G1, and will help to constrain whether G1 was the nucleus of a now disrupted galaxy.
We will image G1 using WFC3 IR as the primary camera. 3 orbits in F275W - purpose: discover and characterize the UV bright stars. 3 orbits in F336W: If UV bright stars are discovered, two flux points will constrain T_eff. 2.5 orbits in F435W: Construct a classical color-magntiude diagram in Johnson B and V to assess metallicity range of the red giants. 2.5 orbits in F606W - same goal as above (CMD). The two bluest colors to constrain the temperature, Mbol and other physical properties of the hot star population. The F435 and F606 provide (1) additional flux points for the UV-bright stars; (2) a Johnson B, V CMD reaching below the HB to assess the metallicity spread.
RESOLVED STELLAR POPULATIONS
12
false
0.0
0.0
false
false
false
false
false
false
SUPPORTED
STELLAR CLUSTER
GLOBULAR CLUSTER
G1 is a globular cluster in M31, 40 kpc from the M31 nucleus.
J2000
00 32 46.5350
+39 34 41.13
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
G1 is a globular cluster in M31, 40 kpc from the M31 nucleus.
J2000
00 32 46.5350
+39 34 41.13
J2000
WFC3/UVIS
Imaging
No
No
F275W
WFC3/UVIS
Imaging
No
No
F336W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
WFC3/UVIS
Imaging
No
No
F438W
WFC3/UVIS
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
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