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24 March 2003

HUBBLE SPACE TELESCOPE

DAILY REPORT       # 3325

PERIOD COVERED: DOYs 80-82

Part 5 of 6

STIS 9626

Slit Wheel Repeatability

Test the repeatibility of the slit wheel by taking a sequence of
comparison lamp spectra with grating G230MB {2697} and the three
smallest long slits {52X0.2, 52X0.1, and 52X0.05}. This is a clone of
Cycle 10 Program 8913. 

STIS 9706

STIS Pure Parallel Imaging Program: Cycle 10

This is the default archival pure parallel program for STIS during
cycle 10.

STIS 9507

STIS/UV snapshot survey of bright AGN

We propose a UV spectroscopic snapshot survey of bright AGN,
quadrupling the number of Seyferts UV spectra and adding dozens of
new quasars, aimed at the following goals: beginenumerate em Finding
the relationship between the intrinsic luminosity of the AGN and the
maximum velocity {and width} of the outflow emanating from it, and
determining the frequency of outflows in low-z AGN as a function of
luminosity. em Surveying IGM absorption line systems in numerous new
sight-lines. em Identifying promising targets for observations with
the future highly sensitive Cosmic Origin Spectrograph. endenumerate
A 35-minute snapshot with exposures in either the G140L or G230L will
yield spectra with a minimum S/N > 15 per resolution element at all
wavelengths for all our potential targets. This will allow us to be
sensitive to absorption lines to a limiting equivalent width of 0.3
Angstrom at the 3 Sigma level. In order to facilitate rapid
observational followup, we waive the data proprietary period
entirely.
 
STIS/CCD/MA1 9459

The Response of the White Dwarf in WZ Sge to the Unexpected July 2001
Superoutburst.

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
observe WZ Sge, the most extreme dwarf nova and one of the closest
known cataclysmic variables, that has undergone a superoutburst in
July 2001 after 22 years in quiescence. Because of the uniqueness of
this event, two DD proposals were approved, one to observe the
outburst itself, and another for us to observe the early decline
phase. Here it is proposed to complete our fundamental study of the
response of a dwarf nova system to an outburst by continuing our UV
coverage of this most extreme outbursting system during its decline
to quiescence. This decline is expected to take more than 3 yrs, with
the most dramatic changes occurring in the first 2 years. This
once-in-a-lifetime chance to obtain high quality, high time {and
spectral} resolution FUV data as the decline progresses into the
critical transition from the disk- dominated phase to the bare white
dwarf, provides an unique opportunity to study the response of the
emerging white dwarf, whose chemical abundances, rotation and
temperature variation with time bear the imprint of this
extraordinary gigantic accretion event. 

STIS/CCD/MA2 9166

Fossil Gaseous Halos of Massive Galaxies at z~1.

The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
observe host galaxies of high-redshift, powerful radio sources that
are likely the progenitors of present-day gE and cD galaxies, and
therefore provide important laboratories in which to investigate the
formation of massive galaxies in the early Universe. Many
high-redshift radio galaxies exhibit giant, Ly-alpha halos.

Similar nebulae without associated radio sources have recently been
discovered in a galaxy overdensity at z = 3.09. The LyAlpha
luminosity of these halos is comparable to the total X-ray
luminosities of low--z X--ray clusters, and may reflect the hot,
cooling gas reservoir from which the galaxy/cluster is forming.

STIS/MA1/CCD 9464

Exploring the Role of Acoustic Heating in Cool Dwarfs and Subgiants

Recent observations cast doubt on the importance of acoustic waves
for chromospheric heating in stars. These include low upper limits to
their contribution to upper layers of the solar chromosphere, and
evidence for significant magnetic heating contribution even in
``basal" activity stars. These findings contradict the widely
accepted picture that acoustic heating accounts for a significant
fraction, the ``basal component'', of chromospheric heating in
inactive stars. To help resolve this issue, we propose to observe two
very inactive stars with significantly different properties to search
for specific signatures of upward propagating acoustic waves:
blue-shifts and enhanced blue wings in chromospheric lines. Solar
data show that the degree of blue-shift can be used to estimate the
acoustic contribution to chromospheric heating. We will compare the
data to HST spectra of similar stars, and solar spectra from the
SUMER instrument on SOHO. Lack of a significant acoustic signature in
our targets would indicate that magnetic heating generated by a
local {turbulent, non-cycling} dynamo is responsible for the basal
component of chromospheric heating in inactive stars. Our targets may
be in a phase analogous to the solar Maunder minimum, and the HST
spectra might serve as a proxy for the solar spectrum in this state.
The spectra will also be used for emission measure analysis
differentially between the Sun and solar-like stars. 

WFPC2 9598

Earth Flats

This proposal monitors flatfield stability. This proposal obtains
sequences of Earth streak flats to construct high quality flat fields
for the WFPC2 filter set. These flat fields will allow mapping of the
OTA illumination pattern and will be used in conjunction with
previous internal and external flats to generate new pipeline
superflats. These Earth flats will complement the Earth flat data
obtained during cycles 4-10. 

WFPC2 9699

POMS Test Proposal: WFII backup parallel archive proposal

This is a POMS test proposal designed to simulate scientific plans.

WFPC2 9676

POMS Test Proposal: WFII parallel archive proposal

This is the 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 2002
Parallels Working Group. 

 - Continued -

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