! Proposal 6423, submission 1 ! PI: Dr. Deidre Hunter ! Received Wed Feb 7 14:58:46 EST 1996 ! From: dah@lowell.edu ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6423,v 3.1 1996/02/08 00:12:26 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6423,v 3.1 1996/02/08 00:12:26 pepsa Exp $ ! ! Refer to the HST Phase II Proposal Instructions to fill this out ! ! Anything after a "!" is ignored, and may be deleted ! ! All keywords with multiple entries are comma delimited except the ! Visit_Requirements and Special_Requirements keywords which can be ! delimited with carriage returns or semi-colons, but not commas ! ! For help call your Program Coordinator: Lucas ! Phone: 410-338-4716 , E-mail: lucas@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-0083.hunter.prop ! Date generated: Fri Dec 22 16:26:43 EST 1995 ! Proposal_Information ! Section 4 Title: Structure in the Superstar Clusters in NGC 1569 Proposal_Category: GO Scientific_Category: STELLAR POPULATIONS Cycle: 6 Investigators PI_name: Dr. Deidre Hunter PI_Institution: Lowell Observatory CoI_Name: Dr. John Gallagher CoI_Institution: University of Wisconsin Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Robert O'Connell CoI_Institution: University of Virginia Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Tammy Smecker-Hane CoI_Institution: University of California-Irvine Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose to use WFPC2 to image the two superstar clusters in NGC 1569. Cycle 1 data showed that these clusters are as luminous and compact as globular clusters are expected to have been at the same age. Thus, the clusters in NGC 1569 could be the closest examples beyond R136 of globular clusters when they were young. However, these clusters are 3--4 magnitudes more luminous than R136. The WFPC2 images will be used to examine the morphology of the clusters, examine the color distribution within the clusters, and resolve the luminous stars in the outer parts of the clusters. From these data we will test the analogy with globular clusters and the assumption of coevality of the clusters. Questions ! Free format text (please update) Observing_Description: The galaxy will be placed in the PC for higher resolution and better PSF sampling. The two clusters in NGC 1569 together fit comfortably within the PC field-of-view, and each cluster is about 30 pixels (1.4") in diameter. Thus, the need for HST is obvious. We will obtain F336W, F555W, F814W, and F656N images of the two clusters. The broad-band filters are chosen to be compatible with the resolved stellar photometry that has been done of R136 and other star clusters. The F656N filter is used to subtract gaseous emission from the broad- band filters. Exposure times have been estimated by scaling from Cycle 1 images. We estimate 2*400 s for F336W, 50s, 2*140s, and 2*300s for F555W, and 50s, 2*100s, and 1*300s for F814W. The series of exposures are designed to avoid saturation for the core, just saturate but not bloom for examination of the middle part of the cluster, and go deep for the outer part of the cluster. The pairs of exposures will allow cosmic rays to be identified and removed. The exposure in F656N will fill the remaining time in the second orbit and result in an exposure time of about 30 minutes, broken into two parts. Real_Time_Justification: ! We are pursuing ground-based observations that will provide ! valuable supplemental information. In particular, this fall ! Hunter will obtain integrated near-IR spectra of the stellar ! CO absorption feature of the two clusters. This feature is ! particularly sensitive to the appearance of red supergiants ! in the clusters, and with models by Olofsson (1989, A&AS, 80, ! 317) for example, one can use these data to place constraints ! on the ages of the clusters. These results will then be ! combined with the UVI photometry to understand the ages and ! star formation history of the clusters. In addition Smecker- ! Hane and collaborators will obtain integrated high-dispersion ! spectra of the clusters with the CFHT (November 1995). These ! data will give a stellar velocity dispersion of the clusters, ! which when combined with the mass distribution obtained from ! WFPC2 images, will allow a determination of the total mass of ! the clusters. This will be a serious test of the analogy of ! these clusters with globulars. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: NGC1569-CLUSTERS Alternate_Names: Description: EXT-CLUSTER,GLOBULAR CLUSTER Position: RA=04H 30M 48.61S +/- 0.1S, DEC=+64D 50' 56" +/- 1", PLATE-ID=01MS Equinox: 2000 RV_or_Z: V=-90 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: V=15.4,SIZE=0.36,E(B-V)=0.56,V-I=0.1 Comments: ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed Visits ! Section 6 Visit_Number: 1 Visit_Requirements: ! Section 7.1 ORIENTation 79D TO 286D ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling On_Hold_Comments: Visit_Comments: The ORIENT requirement is to force a nearby 10th mag star onto one of the WF chips. Otherwise it would fall in the missing L of the PC and cause reflections at the several DN level in the PC, where our clusters are. As a result, however, there will be severe saturation on one of the WF CCDs. Exposure_Number: 1 Target_Name: NGC1569-CLUSTERS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F656N Wavelength: Optional_Parameters: ATD-GAIN=7,CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 800S Special_Requirements: ! Section 7.2 Exposure_Number: 2 Target_Name: NGC1569-CLUSTERS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: ATD-GAIN=7,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 50S Special_Requirements: ! Section 7.2 Exposure_Number: 3 Target_Name: NGC1569-CLUSTERS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: ATD-GAIN=7,CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 140S Special_Requirements: ! Section 7.2 Exposure_Number: 4 Target_Name: NGC1569-CLUSTERS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: ATD-GAIN=7,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 50S Special_Requirements: ! Section 7.2 Exposure_Number: 5 Target_Name: NGC1569-CLUSTERS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Wavelength: Optional_Parameters: ATD-GAIN=7,CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 400S Special_Requirements: ! Section 7.2 Exposure_Number: 6 Target_Name: NGC1569-CLUSTERS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: ATD-GAIN=7,CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 100S Special_Requirements: ! Section 7.2 Exposure_Number: 7 Target_Name: NGC1569-CLUSTERS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: ATD-GAIN=7,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: ! Section 7.2 Exposure_Number: 8 Target_Name: NGC1569-CLUSTERS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: ATD-GAIN=7,CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 300S Special_Requirements: ! Section 7.2 ! Uncomment or copy exposure level special requirements needed Comments: Data_Distribution ! Defaults indicated; change if desired Medium: 8MM ! 8MM or 6250BPI or 1600BPI Blocking_Factor: 10 ! 10 or 1 ! Only astronomers with very old 9- ! track tape drives should consider ! a blocking factor of 1 Ship_To: PI_Address ! STSCI or PI_Address or ! PI Address from Phase I is: ! ! 1400 West Mars Hill Road ! Flagstaff ! 86001 ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! 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