Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_00/hst_status_09_25_00 Дата изменения: Mon Sep 25 21:21:00 2000 Дата индексирования: Sun Dec 23 10:16:52 2007 Кодировка: Поисковые слова: m 31

HUBBLE SPACE TELESCOPE

DAILY REPORT #2714

PERIOD COVERED: 0000Z (UTC) 09/22/00 - 0000Z (UTC) 09/25/00

Daily Status Report as of 269/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed STIS/CCD/MA2 8770 (The Nucleosynthesis of Boron -
Benchmarks for the Galactic Disk)

The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
determine boron (B) abundance. In spite of several HST cycles of B
abundance determinations, we do not know the true, ambient, present-day
abundance of B. Only two stars {with undepleted Li and Be} have been
observed to derive the Population I true B abundance. Past cycles have
focused on {1} halo stars with low metallicity and {2} solar-type stars
with Li and/or Be deficiencies. In this proposal, the stellar abundances
of B will be determined, measured from the B I 2497 Angstrom line from STIS
echelle spectra, of main sequence F-G stars that have retained their full
initial abundances of boron. Our target stars are those for which
ground-based observations show that beryllium is undepleted. These new
abundances will map evolution of the B abundance in the Galactic disk in
the metallicity range from one-third solar up to solar. Then the B, and
previously determined Li and Be abundances, will be used to improve
understanding of the nucleosynthesis of B. There were no reported anomalies.

1.2 Completed Nine Sets of WF/PC-2 8805 (POMS Test Proposal: WFII
Parallel Archive Proposal Continuation)

The WF/PC-2 was used to perform a generic target version of the
WFPC2 Archival Pure Parallel program. The program will be used to take
parallel images of random areas of the sky, following the recommendations
of the Parallels Working. As described in HSTAR 7868 and 2.1, the
acquisition for the sixth iteration of this proposal defaulted to fine lock
backup on one FGS only, possibly affecting two observations. Then, as
described in 2.1 and HSTAR 7869, the acquisition for the eighth iteration
of this proposal failed, affecting two observations. The proposal
completed with no other reported problems.

1.3 Completed Four Sets of STIS/CCD 8837 (CCD Dark Monitor-Part 1)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks. As described in HSTAR 7868 and 2.1, the acquisition for the
final iteration of this proposal defaulted to fine lock backup on one FGS
only, possibly affecting one observation. The proposal completed with no
further reported problems.

1.4 Completed Five Sets of WF/PC-2 8816 (Cycle 9 UV Earthflats)

The WF/PC-2 was used to obtain sequences of earth streak flats to
improve the quality of pipeline flat fields for the WFPC2 UV filter set and
in order to monitor flat field stability. There were no reported problems.

1.5 Completed STIS/CCD/MA2 7353 (Spectra to Constrain the Dynamics of
Clouds in the Narrow-Line Region of NGC 1068)

The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
make observations of the narrow line regions in the Seyfert galaxy
NGC-1068. The results will provide important constraints on more distant
quasars whose emission-line regions are too compact for HST and other
high-resolution telescopes to resolve, and which therefore possess far
fewer dynamical constraints from other wavebands. A wavelength calibration
image was also taken. The observations were executed as scheduled, and no
anomalies were noted.

1.6 Completed Seven Sets of WF/PC-2 8826 (Cycle 9 Supplemental Darks pt 1)

The WF/PC-2 was used to perform a T dark calibration program that
obtains three dark frames every day in order to provide data for monitoring
and characterizing the evolution of hot pixels. There were no reported
anomalies.

1.7 Completed Two Sets of STIS/CCD 8631 (Bright Quasar Close Lensing
Search II)

The Space Telescope Imaging Spectrograph (CCD) was used to expand
the Cycle 8 second generation HST snapshot survey of bright quasars,
optimized to find lenses with component image separations < 1". The
observations completed nominally.

1.8 Completed Three Sets of STIS/CCD 8838 (Bias Monitor - Part 1)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at
gain = 4, to build up high-S/N superbiases and track the evolution of hot
columns. The proposal completed nominally.

1.9 Completed WF/PC-2 8243 (SINS: The Supernova Intensive Study - Cycle 8)

The WF/PC-2 was used to make observations of supernova
SN1997. Supernovae reveal the last stages of stellar evolution, create the
chemical history of the Universe, energize the interstellar gas, and occupy
the center of attention for the extragalactic distance scale and
cosmology. A wavelength calibration image was also taken. The
observations were completed as planned, and no problems were reported.

1.10 Completed STIS/CCD 8228 (The Black Hole Versus Bulge Mass
Relationship in Spiral Galaxies)

The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the galaxy NGC-0613 in order to study the black hole versus
bulge mass relationship in spiral galaxies. A wavelength calibration image
was also taken. The observations were executed as scheduled, and no
anomalies were noted.

1.11 Completed Two Sets of WF/PC-2 8804 (A Survey of Gravitational
Lenses as Cosmological Tools III)

The WF/PC-2 was used to observe 60 known gravitational lenses that
are a unique, mass-selected sample of galaxies, and their properties encode
an enormous range of astrophysical information. The numbers of lenses and
their distribution in separation, lens and source redshift determine both
the cosmological model and the mass function of galaxies and its
evolution. There were no reported problems.

1.12 Completed Four Sets of STIS/CCD 8808 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation III)

The Space Telescope Imaging Spectrograph (CCD) was used to make
non-scripted, parallel observations as part of a POMS test proposal. As
described in 2.1 and HSTAR 7869, the acquisition for the third iteration of
this proposal failed, affecting one observation. The observations
completed with no other anomalous activity.

1.13 Completed Two Sets of STIS/CCD 8870 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation IV)

The Space Telescope Imaging Spectrograph (CCD) was used to make
non-scripted, parallel observations as part of a POMS test proposal. The
observations completed with no anomalous activity.

1.14 Completed WF/PC-2 8701 (Multiplicity among Very-Low Mass Stars and
Brown Dwarfs in Alpha Persei and the Pleiades)

The WF/PC-2 was used to observe open clusters which provide
excellent hunting grounds for brown dwarf {BD} searches. The AlphaPer and
Pleiades clusters are young, nearby and have low extinction. They are
cosidered to be the best-suited places to study the Substellar Mass. A
dozen of cool faint AlphaPer and Pleiades members have been confirmed as
``bona-fide'' BDs with the lithium test. By comparison with those, about
60 very good cluster BD candiates are currently known. The Pleiades SMF
obtained using the most recent deep large CCD surveys indicates that BDs
are quite numerous but do not make a significant contribution to the total
cluster mass. The observations completed with no reported problems.

1.15 Completed WF/PC-2 8599 (A Census of Nuclear Star Clusters in
Late-Type Spiral Galaxies)

The WF/PC-2 was used to conduct an I-band snapshot survey of a
well-defined sample of nearby, face-on spiral galaxies of type Scd or
later. The proposal completed nominally.

1.16 Completed Three Sets of STIS/CCD 8841 (Hot Pixel Annealing C9)

The Space Telescope Imaging Spectrograph (CCD) was used to
improve the effectiveness of the CCD hot pixel annealing process. This is
assessed by measuring the dark current behavior before and after annealing
and by searching for any window contamination effects. In addition CTE
performance is examined by looking for traps in a low signal level
flat. The observations completed with no reported problems.

1.17 Completed WF/PC-2 8162 (Identifying The Hidden Phases Of Galaxy
Evolution)

The WF/PC-2 was used to perform deep surveys in the sub-mm waveband
that are revealing a population of very luminous dusty galaxies at high
redshifts, which are {a} as a population, producing stars at a rate as
large or larger than the optically selected galaxy population at high
redshifts and thus presumably producing a substantial fraction of all stars
that have ever been produced; and {b} doing so, individually, in systems
with bolometric luminosities (i.e. star-formation rates} that are very much
larger than typically seen in the optically-selected population). The
observations completed with no anomalous activity.

1.18 Completed STIS/CCD/MA1 8033 (UV Extinction in M-31)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
study the ultraviolet extinction in galaxy M-31 by making low dispersion
spectra observations of the star M-31-OB6. The purpose is to obtain data
on the spectral types and interstellar extinction of hot stars in the
association. The observations were completed as planned, and no anomalies
were reported.

1.19 Completed STIS/CCD/MA1 7437 (Understanding High-Redshift and
Starburst Galaxies: A UV Spectroscopic Survey of O-Stars in the SMC)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make ultraviolet spectrographic observations of galaxy AV423. The data
from this survey, of importance in many areas of astrophysics, will
immediately be made public as no proprietary period is requested. A
wavelength calibration image was also taken. The observations were
executed as scheduled, and no anomalies were noted.

1.20 Completed WF/PC-2 8059 (POMS Test Proposal: Targeted Parallel
Archive Proposal)

The WF/PC-2 was used to observe the parallel opportunities
available in the neighborhood of bright galaxies are treated in a slightly
different way from the normal pure parallels. Local Group galaxies offer
the opportunity for a closer look at young stellar
populations. Narrow-band images in F656N can be used both to identify
young stars via their emission lines, and to map the gas distribution in
star-forming regions. The observations completed nominally.

1.21 Completed WF/PC-2 8581 (A Search For Low-Mass Companions To
Ultracool Dwarfs)

The WF/PC-2 was used to search for very low-mass {VLM} companions
to a complete sample of 120 late-M and L dwarfs, drawn mainly from the
2MASS and SDSS surveys. The primary goal is to determine the multiplicity
of M < 0.1 M_odot dwarfs. In particular, we aim to identify binary systems
suitable for long-term astrometric monitoring and mass measurement, and
systems with cool, sub-1000K companions. The proposal completed with no
reported problems.

1.22 Completed WF/PC-2 8600 (Dwarf Elliptical Galaxy Snapshot Survey III)

The WF/PC-2 was used to extend our V and I snapshot survey of
nearby dwarf elliptical {dE} galaxies to include a sample of 30 bright dE
with significant globular cluster {GC} populations. There were no reported
problems.

1.23 Completed Two Sets of WF/PC-2 8708 (NGC 625: An Intriguing Nearby
Dwarf Starburst Galaxy)

The WF/PC-2 was used to observe NGC 625 which is a dwarf irregular
galaxy in the nearby Sculptor group experiencing a strong burst of star
formation. Its close proximity and high galactic latitude make it a very
desirable target to help us to understand the starburst phase of dwarf
galaxies. The observations completed nominally, with no reported problems.

1.24 Completed WF/PC-2 8598 (Snapshot Survey of Extended OIIl Lambda
5007Angstrom Emission in Seyfert Galaxies)

The WF/PC-2 was used for a snapshot survey of narrow band OIII
Lambda 5007Angstrom images for a well defined sample of 88 Seyfert galaxies
{29 Seyfert 1s and 59 Seyfert 2s}, 18 of which already have data in the
archive, selected from a mostly isotropic property, the 60Mum flux. These
data will be used: 1} to determine the origin of the misalignment between
the accretion disk axis and the host galaxy plane axis, which can be due to
mergers with other galaxies, or by the self induced radiation warping; 2}
to compare the size and shape of the Narrow Line Regions (NLR) of Seyfert
1s and Seyfert 2s, and to study the frequency of conically shaped NLR in
Seyfert galaxies, which are usually unresolved from ground-based
observations; and 3} estimate the importance of shocks to the ionization of
the NLR. The observations completed with no reported problems.

1.25 Completed Two Sets of FGS 8729 (Speedy Gonzales Mass
Determinations: Fast Orbiting Red Dwarf Systems)

The FGSs were used to observe five fast-orbiting red dwarf systems
to determine masses for objects near the end of the stellar main
sequence. All five systems have periods of two years or less, hence the
moniker "Speedy Gonzales'' systems. In addition, all have parallaxes
placing them within 10 parsecs, so high quality masses with errors less
than 5% can be derived. As described in 2.1 and HSTAR 7869, the
acquisition for the second iteration of this proposal failed, affecting all
observations in that iteration. Otherwise, the observation completed as
planned, with no further problems.

1.26 Completed STIS/CCD 8562 (Probing the Large Scale Structure: Cosmic
Shear Observations) HST

The Space Telescope Imaging Spectrograph (CCD) was used to probe
the distortion of light bundles from distant galaxies, looking at the
statistical properties of the intervening inhomogeneous {dark} matter
distribution. The proposal completed nominally.

1.27 Completed STIS/MA1 8721 (An UV Imaging Survey of IR-Bright Star-
Forming Galaxies)

The Space Telescope Imaging Spectrograph (MA1) was used to carry
out a UV {~1, 600 Angstrom} snapshot imaging survey of all the actively
star-forming galaxies detected by ISO at Lambda>170 Mum and closer than
cz=9000 km/s. The sample covers a large region in the parameter's space of
morphology, luminosity, metallicity, and star formation intensity. As
described in HSTAR 7868 and 2.1, the acquisition for this proposal
defaulted to fine lock backup on one FGS only, possibly affecting one
observation. There were no other reported anomalies.

1.28 Completed FGS 8616 (Masses of Pre-Main Sequence Binaries)

The Fine Guidance Sensors were used to continue mapping the orbits
of young star binaries in the Taurus and Ophiuchus star forming
regions. Our goal is to measure their masses dynamically. This is
important because there are still no low mass young stars with reliably
known masses so calculations of their evolution to the main sequence are
uncalibrated. There were no reported problems.

1.29 Completed WF/PC-2 8183 (Morphology of the Most Massive Galaxies in
the Early Universe)

The WF/PC-2 was used to make observations of the massive radio
galaxy MRC2224-27 in order to study its morphology. High redshift radio
galaxies are fundamentally important probes of galaxy and cluster
formation. The observations were completed as scheduled, and no anomalies
were reported.

1.30 Completed STIS/CCD 8776 (Absolute Proper Motions of Nearby Dwarf
Spheroidal Galaxies)

The Space Telescope Imaging Spectrograph (CCD) was used to measure
precise absolute proper motions for four dwarf spheroidal satellites of the
Milky Way using spectroscopically-confirmed background QSOs to define a
zero- velocity reference frame. No anomalous activity was reported.

1.31 Completed WF/PC-2 8544 (POMS Test Proposal: WFII Backup Parallel
Archive Proposal II)

The WF/PC-2 was used to execute a POMS test proposal that was
designed to simulate scientific plans. No problems were encountered.

1.32 Completed WF/PC-2 8702 (The Most Elusive Nuclei of LMC Planetary
Nebulae)

The WF/PC-2 was used to carry out a SNAPSHOT survey of the faintest
nuclei of planetary nebulae {PNe} in the LMC. This program will be a
crucial follow-on to a Cycle 8 SNAPSHOT of LMC Pne. In thisa case the plan
is to observe the faintest or most obscured nuclei to determine their
evolutionary state to an accuracy not possible in the Galaxy. These
faintest central stars are predicted to be among the most massive nuclei,
and owing to the typically advanced age of the surrounding nebulae, are the
most sensitive discriminants for validating the post-AGB evolution
timescales predicted by theory. The observations completed with no
reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions: 27
Successful: 26

The acquisition at 268/090922Z defaulted to fine lock backup on
FGS-3 only when the scan search limit was exceeded on FGS-1. A map taken
at 268/091343Z showed relatively small errors. HSTAR 7868 was
written. The proposals detailed in 1.2, 1.3 and 1.27 may have been affected.

Per HSTAR 7869, the acquisition scheduled for 268/121412Z failed to
RGA control when the search radius limit was exceeded on FGS-3. Proposals
described in 1.2, 1.12 and 1.25 were affected.

Scheduled Re-acquisitions: 24
Successful: 24

2.2 FHST Updates:
Scheduled: 53
Successful: 53

2.3 Operations Notes:

Using ROP SR-1A, the SSR EDAC error counter was cleared on nine
occasions.

The NSSC-1 engineering report was cleared twice per ROP NS-5.

SSA transmitter #2 was turned on at 265/1352Z and off at
265/1419Z. The same transmitter was turned on at 266/0159Z and off at
266/0247Z. SSA transmitter #1 was turned on at 268/0823Z and turned off at
268/0840Z. In all instances, ROP IC-2 was used.

Two TTRs were written for command dropouts during transmission, at
266/2113Z and at 268/0355Z.

HSTAR 7865 was written when an FHST map taken at 267/090023Z showed
no stars in FHST-1.

Per HSTARs 7688 and 7867, the acquisitions at 267/120907Z and at
268/024233Z exhibited an out-of-limits condition for the "saved FGS error
null bias". The measured values of the roll error were 1152.207 a-s and
1150.856 a-s, respectively.

The 486 engineering status buffer limits were adjusted at 268/1224Z
as directed by ROP DF-18A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/CAW