Notice:
Due to the conversion of some ACS WFC or HRC observations into
WFPC2,
or NICMOS observations after the loss of ACS CCD science
capability
in January, there may be an occasional discrepancy between a
proposal's
listed (and correct) instrument usage and the abstract that
follows
it.
HUBBLE
SPACE TELESCOPE - Continuing to collect World Class Science
DAILY
REPORT # 4444
PERIOD
COVERED: UT September 10, 2007 (DOY 253)
OBSERVATIONS
SCHEDULED
ACS/SBC
10840
The
FUV fluxes of Tauri stars in the Taurus molecular cloud
Present
and forthcoming ground-based and space surveys of the T Tauri
stars
in the Taurus molecular cloud will provide information from high
energy
stellar and accretion radiation to low energy solid state and
molecular
emission from the disk, making those stars perfect
laboratories
to carry out self-consistent studies of disk physics and
evolution.
We propose to complete this wealth of information by
obtaining
ACS/FUV spectra for a significant sample of Taurus T Tauri
stars,
covering a range of accretion properties and dust evolutionary
stages.
FUV fluxes carry ~ 10 - 100 more energy than X-rays into these
disks
and are thus crucial gas heating agents and key to disk dispersal
by photoevaporation.
These observations are a pre-requisite to interpret
observations
with Spitzer, SOFIA, Herschel, and ALMA, and will become
one
of the important legacies of HST to the star formation community.
WFPC2
11024
WFPC2
CYCLE 15 INTERNAL MONITOR
This
calibration proposal is the Cycle 15 routine internal monitor for
WFPC2,
to be run weekly to monitor the health of the cameras. A variety
of
internal exposures are obtained in order to provide a monitor of the
integrity
of the CCD camera electronics in both bays {both gain 7 and
gain
15 -- to test stability of gains and bias levels}, a test for
quantum
efficiency in the CCDs, and a monitor for possible buildup of
contaminants
on the CCD windows. These also provide raw data for
generating
annual super-bias reference files for the calibration
pipeline.
FGS
11212
Filling
the Period Gap for Massive Binaries
The
current census of binaries among the massive O-type stars is
seriously
incomplete for systems in the period range from years to
millennia
because the radial velocity variations are too small and the
angular
separations too close for easy detection. Here we propose to
discover
binaries in this observational gap through a Faint Guidance
Sensor
SNAP survey of relatively bright targets listed in the Galactic O
Star
Catalog. Our primary goal is to determine the binary frequency
among
those in the cluster/association, field, and runaway groups. The
results
will help us assess the role of binaries in massive star
formation
and in the processes that lead to the ejection of massive
stars
from their natal clusters. The program will also lead to the
identification
of new, close binaries that will be targets of long term
spectroscopic
and high angular resolution observations to determine
their
masses and distances. The results will also be important for the
interpretation
of the spectra of suspected and newly identified binary
and
multiple systems.
NIC1
11057
Cycle
15 NICMOS dark current, shading profile, and read noise monitoring
program
The
purpose of this proposal is to monitor the dark current, read noise,
and
shading profile for all three NICMOS detectors throughout the
duration
of Cycle 15. This proposal is a slightly modified version of
proposal
10380 of cycle 13 and 9993 of cycle12 and is the same as Cycle
14.
that we cut down some exposure time to make the observation fit
within
24 orbits.
NIC1/NIC2/NIC3
8794
NICMOS Post-SAA calibration - CR Persistence Part 5
A
new procedure proposed to alleviate the CR-persistence problem of
NICMOS.
Dark frames will be obtained immediately upon exiting the SAA
contour
23, and every time a NICMOS exposure is scheduled within 50
minutes
of coming out of the SAA. The darks will be obtained in parallel
in all
three NICMOS Cameras. The POST-SAA darks will be non- standard
reference
files available to users with a USEAFTER date/time mark. The
keyword
'USEAFTER=date/time' will also be added to the header of each
POST-SAA
DARK frame. The keyword must be populated with the time, in
addition
to the date, because HST crosses the SAA ~8 times per day so
each
POST-SAA DARK will need to have the appropriate time specified, for
users
to identify the ones they need. Both the raw and processed images
will
be archived as POST-SAA DARKs. Generally we expect that all NICMOS
science/calibration
observations started within 50 minutes of leaving an
SAA
will need such maps to remove the CR persistence from the science
images.
Each observation will need its own CRMAP, as different SAA
passages
leave different imprints on the NICMOS detectors.
NIC2
11152
Probing
the compact dust disk of a nearby Classical T Tauri Star
BP
Psc is a high Galactic latitude {b = -57}, bright, IRAS source that
generally
has been classified as a T Tauri star but little studied to
date.
We have carried out a multiwavelength ground-based study of this
object
and find that it is most likely a ~10 Myr classical T Tauri star
surrounded
by a gas and dust disk, and less than 100 pc from Earth,
making
it one of the oldest and closest such stars known. Near-IR AO
images
and IR photometry show it is surrounded by an compact {0.2"},
almost-edge-on,
optically thick disk of dust with a wide range of
temperatures.
We propose a multiwavelength polarimetric study of the
compact
disk to support quantitative modeling to recover disk and dust
parameters.
We also propose coronagraphic imaging to search for
larger-scale
dust structures invisible in ground-based images, and
narrowband
imaging of an outflow jet and associated Herbig- Haro objects
to
study their structure and determine a kinematic distance of the
system.
A massive compact disk surrounding an isolated 10 Myr star is a
unique
environment for planet formation, and its proximity to Earth
allows
HST to study it in detail.
WFPC2
11023
WFPC2
CYCLE 15 Standard Darks - part 1
This
dark calibration program obtains dark frames every week in order to
provide
data for the ongoing calibration of the CCD dark current rate,
and
to monitor and characterize the evolution of hot pixels. Over an
extended
period these data will also provide a monitor of radiation
damage
to the CCDs.
WFPC2
11081
RR
Lyrae stars in M31 Globular Clusters: How did the M31 Spiral Galaxy
Form?
The
pulsation properties of the RR Lyrae stars in the globular clusters
of
the Andromeda galaxy {M31} have the potential to provide essential
insight
on the first epoch of the galaxy formation and to trace the
merging
episodes that led to the assembly of M31. Their mean periods
along
with the cluster metallicities can provide an independent estimate
of
the M31 cluster ages and, in turn, of the time scale of the M31 halo
formation,
by comparison with their Milky Way counterparts. We will
observe
RR Lyrae stars in 6 appropriately selected globular clusters of
M31
using WFPC2 to derive periods, light curves, and physical parameters
of
these eyewitnesses of the first epochs of the M31 formation.
FLIGHT
OPERATIONS SUMMARY:
Significant
Spacecraft Anomalies: (The following are preliminary reports
of
potential non-nominal performance that will be investigated.)
HSTARS:
10989
- REAcq (2,1,1) failed to RGA Hold (Gyro Control)
At 253/11:29:25 REAcq (2,1,1) scheduled from 253/11:26:13 -
11:33:48
failed to RGA Hold (Gyro Control) after receiving a QSTOP flag on
FGS 2.
Mnemonics QF2STOPF, QSTOP, QF1SSDIF and QF2SSDIF all flagged out
due to
this failure.
OBAD #1: V1 -996.75, V2 -1468.06, V3 570.40, RSS 1863.89
OBAD #2: V1 6.61, V2 0.56, V3 -4.70, RSS 8.13
OBAD MAP: Not scheduled
10990
- GSAcq (2,1,1) failed to RGA Hold (Gyro Control)
GSAcq (2,1,1) failed to RGA Hold due to QSTOP flag on FGS 2.
Mnemonics
QF2STOPF, QSTOP, QF1SSDIF and QF2SSDIF all flagged out due to this
failure. No 486 ESB messages were received. The star pair used in
this
acquisition is the same pair as used in HSTAR 10989.
OBAD #1: Unavailable due to LOS
OBAD #2: V1 7.23, V2 0.81, V3 -0.12, RSS 7.28
OBAD MAP: V1 -4.81, V2 1.46, V3 3.62, RSS 6.20
COMPLETED
OPS REQUEST: (None)
COMPLETED
OPS NOTES: (None)
SCHEDULED
SUCCESSFUL
FGS
GSacq
06
05
FGS
REacq
09
08
OBAD
with Maneuver
30
30
SIGNIFICANT
EVENTS: (None)