0
Assigned ID: 1011
----- Attempting Submission 1 (Fri Apr 07 22:38:05 GMT 2017) -----
HST Phase I Proposal 1011 (STISClusters_FULL.apt) successfully submitted.
Receipt: # 1011-1
----- Attempting Submission 2 (Fri Apr 07 23:24:28 GMT 2017) -----
HST Phase I Proposal 1011 (STISClusters_FULL.apt) failed submission.
----- Attempting Submission 3 (Fri Apr 07 23:26:45 GMT 2017) -----
ORBITAL VISIBILITY OVERRUN
ORBITAL VISIBILITY OVERRUN
ORBITAL VISIBILITY OVERRUN
ORBITAL VISIBILITY OVERRUN
ORBITAL VISIBILITY OVERRUN
Updated orbit times for visits to fit the new reacq times.
-2050219325
----- Attempting Submission 1 (Thu Jul 20 23:10:27 GMT 2017) -----
----- Attempting Submission 2 (Fri Feb 02 19:04:16 GMT 2018) -----
----- Attempting Submission 3 (Mon Feb 12 07:23:18 GMT 2018) -----
----- Attempting Submission 4 (Wed Feb 21 04:22:25 GMT 2018) -----
----- Attempting Submission 5 (Mon Jul 16 22:26:02 GMT 2018) -----
----- Attempting Submission 6 (Thu Jul 19 19:42:20 GMT 2018) -----
----- Attempting Submission 7 (Wed Dec 12 08:35:08 GMT 2018) -----
These visits have already been observed.
Dwarfs and Giants: Massive Stars in Little Dwarf Galaxies
Dwarf galaxies are sensitive laboratories for testing theories of star formation and for investigating possible variations of the stellar Initial Mass Function (IMF). Establishing whether the IMF, in particular the upper end of the IMF (uIMF), is invariant or dependent upon the conditions of star formation is key for interpreting the vast majority of observations on galaxy evolution, and for understanding cosmic reionization. Low-metallicity dwarf galaxies are fairly isolated systems that are ideal locales to test the uIMF. We propose to obtain STIS UV/optical spectroscopy of 8 H-alpha bright stellar clusters in 4 dwarf galaxies within 3 Mpc to accurately determine their ages, masses, extinction, metallicity, and stellar content. We will use state of the art stellar synthesis models that include massive star specific evolutionary tracks, massive star rotation, and stochasticity to test whether dwarf galaxies really do have a top-light IMF. The success of this project relies on the spectroscopic UV capability of HST/STIS to isolate young compact star clusters and break the degeneracies between reddening and age.
We plan first-order longslit observations of each cluster with the STIS/G140L grating and MAMA detector as well as the CCD G430M and G750M gratings. In order to mitigate hot pixels and reduce cosmic rays we will dither along the slit between each exposure, instead of implementing a CR-SPLIT. The dithering will be done with shifts of roughly 0.5" per exposure. We use a gain of 1 to reduce read noise, and 1x1 binning to decrease the effects of cosmic rays even at the expense of longer readout times.
We have put the G140L observation into two orbits, and the G430M and G750M observations together into one. Target aquisition is done using a nearby star and the approriate offset to the correct slit position. Because we are using a 0.2" slit-width, no peak-up time is needed. For the optical observations we are implementing the 52x0.2E1 slit to reduce CTE effects. The ORIENTS have been chosen to maximize the science by including as many Halpha regions as possible along the slit. The primary cluster/star of interest is indicated by the Fixed Target list.
Stellar Populations
6
false
false
true
false
false
false
false
SUPPORTED
EXT-CLUSTER
OB ASSOCIATION
OPEN CLUSTER
STAR FORMING REGION
YOUNG ASSOCIATION
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
EXT-CLUSTER
OB ASSOCIATION
OPEN CLUSTER
STAR FORMING REGION
YOUNG ASSOCIATION
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
EXT-CLUSTER
OB ASSOCIATION
STAR FORMING REGION
YOUNG ASSOCIATION
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
EXT-CLUSTER
OB ASSOCIATION
OPEN CLUSTER
STAR FORMING REGION
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
EXT-CLUSTER
OB ASSOCIATION
OPEN CLUSTER
STAR FORMING REGION
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
EXT-CLUSTER
OB ASSOCIATION
OPEN CLUSTER
STAR FORMING REGION
YOUNG ASSOCIATION
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
CALIBRATION
TARGET ACQUISITION TEST
NO
J2000
u=25.28, i=18.40
CALIBRATION
TARGET ACQUISITION TEST
NO
J2000
u=22.13, r=18.32, i=17.77
CALIBRATION
TARGET ACQUISITION TEST
NO
J2000
u=18.55, r=17.13, i=16.99
CALIBRATION
TARGET ACQUISITION TEST
NO
J2000
u=18.52, r=17.30, i=17.19
STIS/FUV-MAMA
Spectroscopic
No
No
G140L
1425
STIS/CCD
Spectroscopic
No
No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
7751
STIS/FUV-MAMA
Spectroscopic
No
No
G140L
1425
STIS/CCD
Spectroscopic
No
No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
7751
STIS/FUV-MAMA
Spectroscopic
No
No
G140L
1425
STIS/CCD
Spectroscopic
No
No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
7751
STIS/FUV-MAMA
Spectroscopic
No
No
G140L
1425
STIS/CCD
Spectroscopic
No
No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
7751
STIS/FUV-MAMA
Spectroscopic
No
No
G140L
1425
STIS/CCD
Spectroscopic
No
No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
7751
STIS/FUV-MAMA
Spectroscopic
No
No
G140L
1425
STIS/CCD
Spectroscopic
No
No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
7751
POS-TARG
DITHER
.5
LINE
false
false
3
90.0
STIS-ALONG-SLIT
1
false
POS-TARG
DITHER
.5
LINE
false
false
2
90.0
STIS-ALONG-SLIT
2
false
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