! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6813,v 4.1 1996/05/07 19:25:26 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6813,v 4.1 1996/05/07 19:25:26 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: Landis ! Phone: 410-338-4560 , E-mail: landis@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-1089.hodge.prop ! Date generated: Fri Dec 22 16:09:23 EST 1995 ! Proposal_Information ! Section 4 Title: The Oldest Star Clusters of Local Group Irregular Galaxies Proposal_Category: GO Scientific_Category: STELLAR POPULATIONS Cycle: 6 Investigators PI_name: Paul Hodge PI_Institution: University of Washington CoI_Name: Mario Mateo CoI_Institution: University of Michigan Contact: N ! Y or N (designate at most one contact) CoI_Name: Toby Smith CoI_Institution: University of Washington Contact: N ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) Globular clusters of spiral and elliptical galaxies are well- studied and they have provided much information on the early histories of these types of galaxies. For irregular galaxies, however, very little is known about the globular clusters and other old clusters. The only irregulars for which much globular cluster research has been carried out are the Magellanic Clouds, and they are probably anomalous because of the interactions of the Clouds with the Milky Way Galaxy (MWG). We are proposing to investigate globular and other old clusters in two Local Group irregular galaxies: WLM and NGC 6822. The WLM globular appears from the limited available photometry to be a normal, massive old globular, possibly similar to the classical globulars of the MWG. The "Hubble clusters" of NGC 6822, which were identified as possible clusters by Hubble, on the other hand, are of lower luminosity, though their colors indicate that they are old. Study of these rare objects will be enlightening about the early history of irregular galaxies. Questions ! Free format text (please update) Observing_Description: We propose to obtain color-magnitude diagrams of the six clusters in the V and I pass-bands in order to determine their ages and approximate abundances. Using the filters specified above, the data can be converted through well-known transformations to the Johnson-Cousins V and I, which photometric system has become a common one for the study of old stellar systems. The exposures will be divided into shorter sections to facilitate identifying cosmic rays. For the clusters in NGC 6822 and IC 1613, which have nearly the same apparent distance moduli of 24.5, we will need to reach V magnitudes at least 1.5 magnitudes below the horizontal branch or red giant clump in order to discern the CMD characteristics. To have a S/N of 10 at V = 26, exposures will need to be 90 minutes per filter (the stars are sufficiently red that the necessary exposures are nearly the same in spite of the decreased sensitivity at the position of the F814W filter). Thus we will need three orbits per cluster. For WLM, the apparent distance modulus is 0.4 magnitudes fainter, and thus to achieve the same accuracy, we will need four orbits. Real_Time_Justification: Calibration_Justification: Additional_Comments: Fixed_Targets Target_Number: 1 Target_Name: WLM-STARCLUS Alternate_Names: Description: EXT-CLUSTER,GLOBULAR CLUSTER Position: RA=00H 01M 49.52S +/- 0.05S, DEC=-15D 27' 31.1" +/- 0.1", PLATE-ID=024M Equinox: J2000 RV_or_Z: Flux: V=16.06, B-V=0.58 Comments: Target_Number: 2 Target_Name: NGC6822-STARCLUS-HIV Alternate_Names: Description: EXT-CLUSTER,GLOBULAR CLUSTER Position: RA=19H 44M 52.18S +/- 0.05S, DEC=-14D 51' 58.0" +/- 0.1", PLATE-ID=00CN Equinox: J2000 RV_or_Z: Flux: V=17.04, B-V=0.78 Comments: Target_Number: 3 Target_Name: NGC6822-STARCLUS-HVI Alternate_Names: Description: EXT-CLUSTER,GLOBULAR CLUSTER Position: RA=19H 44M 53.67S +/- 0.05S, DEC=-14D 49' 11.8" +/- 0.1", PLATE-ID=00CN Equinox: J2000 RV_or_Z: Flux: V=16.11, B-V=0.54 Comments: Target_Number: 4 Target_Name: NGC6822-STARCLUS-HVII Alternate_Names: Description: EXT-CLUSTER,GLOBULAR CLUSTER Position: RA=19H 44M 55.85S +/- 0.05S, DEC=-14D 48' 55.8" +/- 0.1", PLATE-ID=00CN Equinox: J2000 RV_or_Z: Flux: V=16.28, B-V=0.57 Comments: Target_Number: 5 Target_Name: NGC6822-STARCLUS-HVIII Alternate_Names: Description: EXT-CLUSTER,GLOBULAR CLUSTER Position: RA=19H 44M 58.33S +/- 0.05S, DEC=-14D 43' 13.8" +/- 0.1", PLATE-ID=00CN Equinox: J2000 RV_or_Z: Flux: V=17.37, B-V=0.75 Comments: Visits ! Section 6 Visit_Number: 01 Visit_Requirements: ORIENT 298D TO 58D On_Hold_Comments: Visit_Comments: Exposure_Number: 10 Target_Name: WLM-STARCLUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=0.482 Number_of_Iterations: 1 Time_Per_Exposure: 5400S Special_Requirements: Exposure_Number: 11 Target_Name: WLM-STARCLUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 5400S Special_Requirements: Visits ! Section 6 Visit_Number: 02 Visit_Requirements: ! Section 7.1 On_Hold_Comments: Visit_Comments: Exposure_Number: 10 Target_Name: NGC6822-STARCLUS-HIV Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 3900S Special_Requirements: Exposure_Number: 11 Target_Name: NGC6822-STARCLUS-HIV Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 3900S Special_Requirements: Exposure_Number: 20 Target_Name: NGC6822-STARCLUS-HVI Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 3900S Special_Requirements: Exposure_Number: 21 Target_Name: NGC6822-STARCLUS-HVI Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 3900S Special_Requirements: Exposure_Number: 30 Target_Name: NGC6822-STARCLUS-HVII Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 3900S Special_Requirements: Exposure_Number: 31 Target_Name: NGC6822-STARCLUS-HVII Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 3900S Special_Requirements: Exposure_Number: 40 Target_Name: NGC6822-STARCLUS-HVIII Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 3900S Special_Requirements: Exposure_Number: 41 Target_Name: NGC6822-STARCLUS-HVIII Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 3900S Special_Requirements: 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: ! ! Astronomy Department ! Box 351580 ! Seattle ! 98195-1580 ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: ! Needed if Ship_To: is not PI_Address ! ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator