! $Id: 5384,v 6.1 1994/07/27 17:21:58 pepsa Exp $
coverpage:
title_1: RESOLVED AND COMPOSITE PROPERTIES OF THE GIANT HII REGIONS IN M33
title_2: CYCLE4MEDIUM
sci_cat: HOT STARS
sci_subcat: CLUSTERS
proposal_for: GO
pi_fname: WILLIAM
pi_lname: WALLER
pi_inst: HUGHES STX
pi_country: USA
pi_phone: (301)513-5475
keywords_1: GALAXY;M33
keywords_2: CLUSTERS;OB ASSOCIATIONS
hours_pri: 2.23
num_pri: 6
wf_pc: Y
funds_amount: 77416
funds_length: 12
funds_date: JUN-94
pi_position: SENIOR SCIENTIST
off_fname: DAVID
off_lname: SHERRY
off_title: CONTRACTS DIRECTOR
off_inst: 3480
off_addr_1: 4400 FORBES BLVD.
off_city: LANHAM
off_state: MD
off_zip: 20706
off_country: USA
off_phone: (301)-794-5306
! end of coverpage
abstract:
line_1: We propose to evaluate the degree to which metal abundance affects
line_2: stellar population at the high-mass end. We will target the galaxy
line_3: M33, whose proximity and large sample of HII regions of differing
line_4: metallicity make it ideally suited for such a study. Rather than
line_5: relying on COMPOSITE spectral indices of stellar population, we will
line_6: exploit the superior acuity of the HST to RESOLVE the individual stars
line_7: that underly and power 6 of the brightest HII regions in M33. Through
line_8: multi-band imaging with the WFPC2 camera and subsequent photometry,
line_9: we will be able to differentiate among the upper main-sequence, giant,
line_10: supergiant, and Wolf-Rayet stars. Once we resolve and
line_11: decompose the ionizing clusters, we will then be able to provide a
line_12: critical evaluation of the relationship between metallicity and stellar
line_13: population. Moreover, by comparing the resolved stellar populations
line_14: in M33's giant HII regions with their composite colors and
line_15: emission-line properties, we will be able to provide an essential
line_16: foundation for interpreting the composite spectral indices of starburst
line_17: regions in more distant galaxies.
!
! end of abstract
general_form_proposers:
lname: WALLER
fname: WILLIAM
inst: 3480
country: USA
!
lname: DRISSEN
fname: LAURENT
inst: 3470
country: USA
!
lname: HEAP
fname: SARA
inst: 2866
country: USA
!
lname: HODGE
fname: PAUL
inst: 3760
country: USA
!
lname: MALUMUTH
fname: ELIOT
inst: 1780
country: USA
!
lname: PARKER
fname: JOEL
inst: 2866
country: USA
!
lname: TAYLOR
fname: DAVID
inst: 1780
country: USA
!
lname: WILSON
fname: CHRISTINE
inst: 4642
country: CANADA
!
! end of general_form_proposers block
general_form_text:
question: 3
section: 1
line_1: To resolve and characterize the brightest and hottest stars in M33's giant
line_2: HII regions, we propose to use the WFPC2 to obtain PC images of 6 HII regions
line_3: through filters that approximate the Johnson UBV passbands. The filters used
line_4: will be the F336W (U), F439W (B), and F547M (V), the later of which avoids the
line_5: strong [OIII] and H-beta emission lines. To maximize the prominence of the
line_6: hottest stars in the crowded fields and to provide further constraints on the
line_7: reddening and spectral types of the stars, we will also obtain frames through
line_8: the F170W ultraviolet filter. The 6 targets are giant HII regions which span
line_9: a wide range of metallicities and environments --- from the near-nuclear HII
line_10: region CC 93 (O/H x 10e4 = 10.5) to the outer-disk HII region NGC 588
line_11: (O/H x 10e4 = 2.0).
line_13: All exposure times are based on our desire to achieve photometric accuracies
line_14: of 10 percent or better down to V=21.1 magnitude. This can be done, if we
line_15: obtain a S/N ratio of about 30 in the central pixel of each resolved star.
line_16: To obtain this S/N ratio will require exposures of 360S, 320S, 360S, and 200S
line_17: respectively for the F170W, F336W, F439W, and F547M filters. Each exposure
line_18: will be split into two equal exposures using the CR-SPLIT=0.5 optional
line_19: parameter to facilitate the removal of cosmic-ray events. Since the HII
line_20: regions are extended sources, they will be centered in the PC1 field of view
line_21: by using the PC1-FIX aperture. These exposures will allow us to achieve
line_22: a photometric accuracy of 0.10 mag or better for any main sequence star
line_23: earlier than B0, and yet avoid saturation of the brighter O-type supergiants.
!
question: 3
section: 2
line_1: In addition, a narrow-band image of NGC 588 will be obtained
line_2: through filter F469N with the intention of identifying Wolf-Rayet stars through
line_3: their HeII (4686A) line emission. A 600S CR-SPLIT=0.5 exposure
line_4: will achieve a S/N similar to those obtained by Drissen et al. (1993)
line_5: in their WF/PC-1 imaging of NGC 595 and NGC 604. The narrow-band imaging of
line_6: NGC 588 is motivated by spectroscopic evidence for HeII emission
line_7: from W-R stars in this HII regions (Conti and Massey 1981). NGC 588 is of
line_8: special interest because of its exceptionally low metallicity.
!
question: 4
section: 1
line_1: Ground-based resolution of ionizing clusters into individual stars has been
line_2: achieved with limited success for some galaxies of the Local Group (cf. Massey
line_3: et al. 1989). HST observations during Cycles 1-3 have provided much clearer
line_4: views of such objects as 30 Doradus in the LMC, NGC 346 in the SMC, and NGC 604
line_5: in M33. At the distance of M33, the superior acuity of the HST enabled Drissen
line_6: et al. (1993) to resolve a multitude of hot luminous stars -- even
line_7: in the most crowded cores of the HII regions. To classify these stars and
line_8: the stellar populations in M33's other giant HII regions, it is necessary to
line_9: conduct U,B,V, abd UV imaging using the HST. The additional narrow band
line_10: imaging at 4690 A will enable us to isolate the extremely hot WR-type stars.
line_11: By targeting 6 HII regions of differing metallicity, we will be able to
line_12: characterize their ionizing stellar populations and evaluate their sensitivity
line_13: to metallicity -- all in the same galaxy. This cannot be done via ground-based
line_14: imaging, nor can it be done with any of the prior or currently scheduled HST
line_15: programs.
!
question: 5
section: 1
line_1: For each of the 6 targets, all of the exposures of that target
line_2: must be taken at the same pointing and roll-angle. This is achieved
line_3: through the use of the SEQ NO GAP special requirement.
!
question: 6
section: 1
line_1: Provided that flat field exposures are obtained through the F170W, F336W,
line_2: F439W, F547M, and F469N filters as part of the regular calibration
line_3: plan, no special calibration exposures are required for this program.
!
!
question: 8
section: 1
line_1:
!
question: 9
section: 1
line_1: See phase 1 proposal.
!
question: 10
section: 1
line_1: See phase 1 proposal.
!
!end of general form text
general_form_address:
lname: WALLER
fname: WILLIAM
category: PI
inst: 3480
addr_1: Code 681
addr_2: Goddard Space Flight Center
city: Greenbelt
state: MD
zip: 20771
country: USA
phone: (301) 513-5475
telex: WALLER@STARS.GSFC.NASA.GOV
!
! end of general_form_address records
fixed_targets:
targnum: 1
name_1: M33-NEB1
name_2: CC93
descr_1: D,
descr_2: 203
pos_1: RA = 01H 33M 52.51S +/- 0.15S,
pos_2: DEC = +30D 39' 17.4" +/- 2.0"
equinox: J2000
rv_or_z: V=-180
fluxnum_1: 1
fluxval_1: V=20.6
fluxnum_2: 1
fluxval_2: B-V=-0.3
fluxnum_3: 2
fluxval_3: E(B-V)=0.16
!
targnum: 2
name_1: M33-NEB2
name_2: IC142
descr_1: D,
descr_2: 203
pos_1: RA = 01H 33M 55.70S +/- 0.15S,
pos_2: DEC = +30D 45' 26.0" +/- 2.0"
equinox: J2000
rv_or_z: V=-180
fluxnum_1: 1
fluxval_1: V=20.6
fluxnum_2: 1
fluxval_2: B-V=-0.3
fluxnum_3: 2
fluxval_3: E(B-V)=0.16
!
targnum: 3
name_1: M33-NEB3
name_2: MA2
descr_1: D,
descr_2: 203
pos_1: RA = 01H 34M 15.39S +/- 0.15S,
pos_2: DEC = +30D 37' 07.0" +/- 2.0"
equinox: J2000
rv_or_z: V=-180
fluxnum_1: 1
fluxval_1: V=20.6
fluxnum_2: 1
fluxval_2: B-V=-0.3
fluxnum_3: 2
fluxval_3: E(B-V)=0.16
!
targnum: 4
name_1: M33-NEB4
name_2: NGC588
descr_1: D,
descr_2: 203
pos_1: RA = 01H 32M 45.56S +/- 0.15S,
pos_2: DEC = +30D 38' 57.6" +/- 2.0"
equinox: J2000
rv_or_z: V=-180
fluxnum_1: 1
fluxval_1: V=20.6
fluxnum_2: 1
fluxval_2: B-V=-0.3
fluxnum_3: 2
fluxval_3: E(B-V)=0.16
!
targnum: 6
name_1: M33-NEB6
name_2: NGC595
descr_1: D,
descr_2: 203
pos_1: RA = 01H 33M 33.61S +/- 0.15S,
pos_2: DEC = +30D 41' 32.0" +/- 2.0"
equinox: J2000
rv_or_z: V=-180
fluxnum_1: 1
fluxval_1: V=20.6
fluxnum_2: 1
fluxval_2: B-V=-0.3
fluxnum_3: 2
fluxval_3: E(B-V)=0.16
!
targnum: 7
name_1: M33-NEB7
name_2: NGC604
descr_1: D,
descr_2: 203
pos_1: RA = 01H 34M 32.85S +/- 0.15S,
pos_2: DEC = +30D 47' 01.6" +/- 2.0"
equinox: J2000
rv_or_z: V=-180
fluxnum_1: 1
fluxval_1: V=20.6
fluxnum_2: 1
fluxval_2: B-V=-0.3
fluxnum_3: 2
fluxval_3: E(B-V)=0.16
!
! end of fixed targets
! No solar system records found
! No generic target records found
exposure_logsheet:
linenum: 1.100
targname: M33-NEB1
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F170W
num_exp: 1
time_per_exp: 700S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
req_2: SEQ 1.1-1.4 NO GAP
!
linenum: 1.200
targname: M33-NEB1
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F336W
num_exp: 1
time_per_exp: 320S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 1.300
targname: M33-NEB1
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F439W
num_exp: 1
time_per_exp: 360S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 1.400
targname: M33-NEB1
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F547M
num_exp: 1
time_per_exp: 200S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 2.100
targname: M33-NEB2
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F170W
num_exp: 1
time_per_exp: 700S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
req_2: SEQ 2.1-2.4 NO GAP
!
linenum: 2.200
targname: M33-NEB2
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F336W
num_exp: 1
time_per_exp: 320S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 2.300
targname: M33-NEB2
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F439W
num_exp: 1
time_per_exp: 360S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 2.400
targname: M33-NEB2
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F547M
num_exp: 1
time_per_exp: 200S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 3.100
targname: M33-NEB3
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F170W
num_exp: 1
time_per_exp: 700S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
req_2: SEQ 3.1-3.4 NO GAP
!
linenum: 3.200
targname: M33-NEB3
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F336W
num_exp: 1
time_per_exp: 320S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 3.300
targname: M33-NEB3
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F439W
num_exp: 1
time_per_exp: 360S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 3.400
targname: M33-NEB3
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F547M
num_exp: 1
time_per_exp: 200S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 4.100
targname: M33-NEB4
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F170W
num_exp: 1
time_per_exp: 700S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
req_2: SEQ 4.1-4.5 NO GAP
!
linenum: 4.200
targname: M33-NEB4
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F336W
num_exp: 1
time_per_exp: 320S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 4.300
targname: M33-NEB4
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F439W
num_exp: 1
time_per_exp: 360S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 4.400
targname: M33-NEB4
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F547M
num_exp: 1
time_per_exp: 200S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 4.500
targname: M33-NEB4
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F469N
num_exp: 1
time_per_exp: 600S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 6.100
targname: M33-NEB6
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F170W
num_exp: 1
time_per_exp: 700S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
req_2: SEQ 6.1-6.4 NO GAP
!
linenum: 6.200
targname: M33-NEB6
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F336W
num_exp: 1
time_per_exp: 320S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 6.300
targname: M33-NEB6
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F439W
num_exp: 1
time_per_exp: 360S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 6.400
targname: M33-NEB6
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F547M
num_exp: 1
time_per_exp: 200S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
linenum: 7.100
targname: M33-NEB7
config: WFPC2
opmode: IMAGE
aperture: PC1-FIX
sp_element: F170W
num_exp: 1
time_per_exp: 700S
s_to_n: 30
fluxnum_1: 1
fluxnum_2: 2
priority: 1
param_1: CR-SPLIT = 0.5
param_2: CR-TOLERANCE=0.0
req_1: CYCLE 4;
!
! end of exposure logsheet
! No scan data records found