0
Assigned ID: 417
----- Attempting Submission 1 (Fri Apr 11 10:26:58 GMT 2014) -----
HST Phase I Proposal 417 (strom22-final.apt) successfully submitted.
----- Attempting Submission 2 (Sat Apr 12 00:50:00 GMT 2014) -----
HST Phase I Proposal 417 (strom22-final.apt) successfully submitted.
This target is not used in this proposal.
PARALLELS SIGNIFICANTLY EXTEND ALIGNMENT TIME
PARALLELS SIGNIFICANTLY EXTEND ALIGNMENT TIME
PARALLELS SIGNIFICANTLY EXTEND ALIGNMENT TIME
PARALLELS SIGNIFICANTLY EXTEND ALIGNMENT TIME
Still some fine-tuning to perform on the dithers and the arrangement of parallel exposures. ORIENT range chosen to maximize
overlap with GO-11664 while still affording a large range of observable intervals and making ACS/WFC parallels overlap
existing WFC3/UVIS coverage.
UPDATE 1 (1:05am EST Fri Jul 25): Included more ACS/WFC3 parallel orbits;
split Visit01 into two (Visit01, Visit14) to keep the phase II uniform: now
one orbit per visit everywhere.
UPDATE 2: Corrected prime target coordinates to match GO-11664; re-ordered
the visits to keep blocks of observations at similar filters near to each other
1585236935
----- Attempting Submission 1 (Thu Jul 24 23:36:34 GMT 2014) -----
HST Phase II Proposal 13758 (strom22-v13c.apt) successfully submitted.
----- Attempting Submission 2 (Fri Jul 25 05:06:51 GMT 2014) -----
----- Attempting Submission 3 (Mon Jul 28 01:29:49 GMT 2014) -----
Target NGC-6553 currently a placeholder from an earlier version of the Phase II.
The Age-Metallicity relationship of the Galactic Bulge via Stromgren Photometry
We propose to use the WFC3 Stromgren filter set to image the Galactic bulge in the well studied SWEEPS deep field. The main aim is an independent test of a putative intermediate age, metal rich, population seen in the microlensed dwarf population. Proper motion separation, combined with the application of the Stromgren photometric measurements, offers the potential of determining the age-metallicity relationship for the bulge, which no present ground-based facility can attempt. The age-metallicity relationship is a fundamental description of the formation history of the Galactic bulge, and the age/metallicity precision of the Stromgren calibration offers our best hope of constraining the age range in the bulge population. At present, there is strong evidence that the bulge is actually a bar that has buckled dynamically into its present form. However, the presence of an abundance gradient is at odds with purely dynamical secular evolution, unless the metal poor population is also signficantly older than the bulk of the more metal rich stars. Our proposed observations can also separate out dwarfs with [Fe/H]<-2, that are rare in the bulge and may have unique kinematics if they are associated with a "first stars" generation of formation.
The SWEEPS field of the Galactic bulge has been extremely well studied by Clarkson et al. (2008), who did the best proper motion separation to date ever done for a bulge field. Further, Brown et al. targeted this field in the bulge Treasury survey. Our goal is to employ the Stromgren filter set on WFC3 to accomplish the best possible photometric age and metallicity separation of populations in the bulge, hopefully testing whether the claims for a 25% young bulge population are correct. Deep integrations are used for F395N (Ca HK filter useful for very metal poor stars), F390M (shown by Holtzman et al. to have superior abundance measurement capability), and F410M (v), 467M (b), and 547M (y). We will rederive even better proper motions, and coordinate observations with the MUSE instruemtn will provide radial velocities for a subset of our sample.
One metal rich clusters lacking Stromgren observations is targeted also, NGC 6528; NGC 6553 was dropped when it was realized that after phase 2, there were not sufficient orbits to target this cluster. Also, the number of parallels was reduced because of interfering buffer dumps. This is solved by placing ACS parallels at the end of a visit.
RESOLVED STELLAR POPULATIONS
12
false
true
0.0
0.0
false
false
false
SUPPORTED
STAR
BULGE
J2000
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
WFC3/UVIS
Imaging
No
No
F336W
WFC3/UVIS
Imaging
No
No
F410M
WFC3/UVIS
Imaging
No
No
F467M
WFC3/UVIS
Imaging
No
No
F547M
WFC3/UVIS
Imaging
No
No
F438W
WFC3/UVIS
Imaging
No
No
F390M
WFC3/UVIS
Imaging
No
No
F395N
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
WFC3/UVIS
Imaging
No
No
F336W
WFC3/UVIS
Imaging
No
No
F410M
WFC3/UVIS
Imaging
No
No
F467M
WFC3/UVIS
Imaging
No
No
F547M
WFC3/UVIS
Imaging
No
No
F336W
WFC3/UVIS
Imaging
No
No
F410M
WFC3/UVIS
Imaging
No
No
F467M
WFC3/UVIS
Imaging
No
No
F547M
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
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