FUV imaging survey of Galactic open clusters
We propose a WFPC2 FUV imaging survey of 6 Galactic open clusters with ages ranging from 1 Myr to 300 Myr complemented with NUV/optical imaging of the same fields. No such survey has ever been attempted before in the FUV at the resolution of WFPC2 (indeed, no WFPC2 FUV images of any Galactic open cluster exist in the HST archive) and, since WFPC2 will be retired in SM4 and none of the other HST instruments can do FUV imaging of bright objects, this is the last chance to do such a survey before another UV telescope is launched. This survey will provide a new perspective on young/intermediate age Galactic clusters and a key template for the study of star formation at high redshift, where the intensity peak we observe in the optical/NIR from Earth is located in the FUV in its rest frame. For clusters still associated with an H II region, UV imaging maps the continuum emission of the ionized gas and the radiation scattered by background dust and, combined with optical nebular images, can be used to determine the 3-D structure of the H II region. For all young clusters, FUV+NUV+optical photometry can be used to study the UV excesses of T-Tauri stars. For clusters older than ~40 Myr, the same photometric combination is the easiest method to detect companion white dwarfs which are invisible using only the optical and NIR. WFPC2 is also an excellent instrument to discover close companions around bright stars and improve our knowledge of their multiplicity fraction. Finally, for all clusters, the combination of high-spatial-resolution UV and optical photometry can be used to simultaneously measure the temperature, extinction, extinction law, distance, and existence of companions (resolved and unresolved) and, thus, produce clean HR diagrams with resolved cluster membership and much-reduced systematic uncertainties.
We will observe each one of our targets using a single pointing with two different dithering positions. We will use 9 main filters: [1] F170W, [2] F255W, [3] F336W, [4] F439W, [5] F547M, [6] F656N, [7] F675W, and [8] F814W for all objects plus [9] F487N for the two youngest targets and [9] F160BW for the four oldest ones. In addition, when necessary we will use F343N, F410M, F502N, F673N, and F850LP as proxies for F336W,F439W, F547M, F657W, and F850LP, respectively, in order to observe the brightest stars if they saturate in the main filters even for the shortest exposure times available with WFPC2. Our fields include a combination of very bright point sources (hot MS stars and bright WDs in the UV) which demand short exposures to avoid saturation, extended low-surface-brightness objects H II regions and possible reflection nebulae), and dim point sources (cool main-sequence stars and white dwarfs). Hence, for each object and filter we will obtain a total of four exposures (two per dithering position) with different exposure times ranging from very short (0.1 s) to long (200-1100 s). At the same time, the use of two dithering positions and four exposures per filter should allow us to improve the spatial resolution of the images and eliminate cosmic rays without requiring identical exposures. For the four targets with F160BW exposures we will use one offset pointing with two dithering positions to account for the pinhole in WF3.
RESOLVED STELLAR POPULATIONS
12
false
0.0
0.0
false
false
false
false
false
SUPPORTED
STELLAR CLUSTER
EMISSION LINE NEBULA
OPEN CLUSTER
STAR FORMING REGION
V magnitude is that of Herschel 36
J2000
18 03 40.2000
-24 22 43.00
J2000
STELLAR CLUSTER
EMISSION LINE NEBULA
OPEN CLUSTER
STAR FORMING REGION
V magnitude is that of HD 168076
J2000
18 18 39.0000
-13 47 39.00
J2000
STELLAR CLUSTER
OPEN CLUSTER
V magnitude is that of HD 152248
J2000
16 54 15.0000
-41 50 0.00
J2000
STELLAR CLUSTER
OPEN CLUSTER
V magnitude is that of Kappa Crucis
J2000
12 53 49.0000
-60 21 8.00
J2000
STELLAR CLUSTER
OPEN CLUSTER
V magnitude is that of BD +35 4515
J2000
21 24 26.0000
+36 30 43.00
J2000
STELLAR CLUSTER
OPEN CLUSTER
V magnitude is that of HD 322658
J2000
17 04 42.0000
-37 58 34.00
J2000
WFPC2
Imaging
No
F170W
WFPC2
Imaging
No
F255W
WFPC2
Imaging
No
F336W
WFPC2
Imaging
No
F439W
WFPC2
Imaging
No
F487N
WFPC2
Imaging
No
F547M
WFPC2
Imaging
No
F656N
WFPC2
Imaging
No
F675W
WFPC2
Imaging
No
F814W
WFPC2
Imaging
No
F170W
WFPC2
Imaging
No
F255W
WFPC2
Imaging
No
F336W
WFPC2
Imaging
No
F439W
WFPC2
Imaging
No
F487N
WFPC2
Imaging
No
F547M
WFPC2
Imaging
No
F656N
WFPC2
Imaging
No
F675W
WFPC2
Imaging
No
F814W
WFPC2
Imaging
No
F160BW
WFPC2
Imaging
No
F170W
WFPC2
Imaging
No
F255W
WFPC2
Imaging
No
F336W
WFPC2
Imaging
No
F439W
WFPC2
Imaging
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F547M
WFPC2
Imaging
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F656N
WFPC2
Imaging
No
F675W
WFPC2
Imaging
No
F814W
WFPC2
Imaging
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F160BW
WFPC2
Imaging
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F170W
WFPC2
Imaging
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F255W
WFPC2
Imaging
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F336W
WFPC2
Imaging
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F439W
WFPC2
Imaging
No
F547M
WFPC2
Imaging
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F656N
WFPC2
Imaging
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F675W
WFPC2
Imaging
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F814W
WFPC2
Imaging
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WFPC2
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F656N
WFPC2
Imaging
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F675W
WFPC2
Imaging
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F814W
WFPC2
Imaging
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F160BW
WFPC2
Imaging
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F170W
WFPC2
Imaging
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F255W
WFPC2
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F336W
WFPC2
Imaging
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F439W
WFPC2
Imaging
No
F547M
WFPC2
Imaging
No
F656N
WFPC2
Imaging
No
F675W
WFPC2
Imaging
No
F814W
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:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3159
:pcs-gap 0
)
true
4
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 11981
:visit-id "09"
:proposal-version -1
:trans-version "20080807"
:date "18-Mar-2009 13:13:23.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "26"
:si-bright-earth-limb-angle 20.0
:data-volume 672240
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11981
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11981
:visit-id "09"
:orbit-number 1
:pcs-time 355
:si-vis-utilization 2760
:al-overhead-at-end 180
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3159
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11981
:visit-id "09"
:orbit-number 2
:pcs-time 355
:si-vis-utilization 2760
:al-overhead-at-end 180
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3159
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 11981
:visit-id "10"
:proposal-version -1
:trans-version "20080807"
:date "18-Mar-2009 13:24:13.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "26"
:si-bright-earth-limb-angle 20.0
:data-volume 1299664
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11981
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11981
:visit-id "10"
:orbit-number 1
:pcs-time 355
:si-vis-utilization 2760
:al-overhead-at-end 180
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3159
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11981
:visit-id "10"
:orbit-number 2
:pcs-time 355
:si-vis-utilization 2700
:al-overhead-at-end 180
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3159
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11981
:visit-id "10"
:orbit-number 3
:pcs-time 355
:si-vis-utilization 2780
:al-overhead-at-end 160
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3159
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11981
:visit-id "10"
:orbit-number 4
:pcs-time 355
:si-vis-utilization 2760
:al-overhead-at-end 180
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3159
:pcs-gap 0
)
true
4
0