! Proposal 5907, submission 1 ! PI: Pascale JABLONKA ! Received Tue Mar 7 13:53:02 EST 1995 ! From: odea@stsci.edu ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5907,v 5.1 1995/06/02 15:09:08 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: Marc Bremmer ! Phone: 410 338-4458 , E-mail: bremmer@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Date generated: Sat Dec 17 10:04:17 EST 1994 ! Proposal_Information ! Section 4 Title: Colour magnitude diagrams of two super- metal-rich globular clusters in M31 Proposal_Category: GO Scientific_Category: Stellar Populations Cycle: 5 Investigators PI_name: Pascale JABLONKA PI_Institution: Observatoire de Meudon, DAEC CoI_Name: Terry BRIDGES CoI_Institution: Institute of Astronomy, Cambridge Contact: ! Y or N (designate at most one contact) CoI_Name: Andre MAEDER CoI_Institution: Observatoire de Geneve Contact: ! Y or N (designate at most one contact) CoI_Name: Georges MEYLAN CoI_Institution: European Southern Observatory Contact: ! Y or N (designate at most one contact) CoI_Name: Georges MEYNET CoI_Institution: Observatoire de Geneve Contact: ! Y or N (designate at most one contact) CoI_Name: Ata SARAJEDINI CoI_Institution: Kitt Peak National Observatory Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose to observe one of the most metal-rich globular cluster ever found, G177, recently identified in M31. We wish to take deep images in V and I bands, taking advantage of the high spatial resolution and red sensitivity of the Planetary Camera of WFPC2/HST, in order to build their colour-magnitude diagrams. With respect to the outstanding properties of G177, we will address the questions of its metallicity, both in absolute scale, by confrontation with theoretical stellar evolutionary tracks, and in relative scale, by comparison with coeval observations of two other clusters, G1 and G170, used as standards. The data we propose to obtain would provide essential input for theories of stellar evolution, star formation history, and models of star cluster and galaxy formation. Questions ! Free format text (please update) Observing_Description: We plan to reach V~eq 26, with signal-to-noise ratio ~ 10 for unambiguous detection with good enough photometry in the CMDs. Our 3 clusters split into two classes: G170, and G177, whose positions relatively close to the center of M31 induce a rather high value of the sky surface brightness (~ 18.5 -- 19 Vmag arcsec^-2), and G1 which has a sky surface brightness ~ 22 Vmag arcsec^-2 since it is located far from the center of the galaxy. For G170, and G177, we plan to integrate about 1.5 hours in both F555W (V) and F814W (I) filters. This would produce about 4 orbits per cluster, with an optimized division in exposures which would provide a good orbit packing, while allowing of course for the GS acquisition and the readout overheads. For G1, we plan to integrate only 1/2 hour in both F555W (V) and F814W (I) filters. This would produce 2 orbits, with an optimized division in exposures which would provide a good orbit packing, while allowing for the GS acquisition and the readout overheads. Due to the multiplicity of exposures, cosmic-ray splits would not be necessary. The PC chip will be centered on the target clusters, for maximum spatial resolution there. The PC will be oriented to maximize the scientific output of the three surrounding WFC chips. Real_Time_Justification: We need sub-pixel shifts in between frames. Because HST is undersampled, even by the PC, it becomes important to deal with this problem in our program. We have designed a program of exposures shifted by +/- 5.5 pixels. This will enable us to regain the sampling of the PC images required for high precision photometry. None. Calibration_Justification: Additional_Comments: Fixed_Targets Target_Number:1 Target_Name:NGC224-G1 Alternate_Names: Description:EXT-CLUSTER Position:RA=0H 32M 46.535S +/- 0.2S, DEC=39D 34' 41.13" +/- 0.2", PLATE-ID=0738 Equinox:J2000 Flux: V=13.70 B-V=0.86 V-I=0.93 SURF(V)=13.5 Comments: Target_Number:2 Target_Name:NGC224-G177 Alternate_Names: Description:EXT-CLUSTER Position:RA=0H 42M 34.349S +/- 0.2S, DEC=41D 14' 02.04" +/- 0.2", PLATE-ID=0738 Equinox:J2000 Flux: V=16.05 B-V=1.27 Comments: Target_Number:3 Target_Name:NGC224-G170 Alternate_Names: Description:EXT-CLUSTER Position:RA=0H 42M 32.426S +/- 0.2S, DEC=41D 10' 33.92" +/- 0.2", PLATE-ID=0738 Equinox:J2000 Flux: V=16.45 B-V=1.23 Comments: the real coordinates of G170 are RA=0H 42M 32.093S +/- 0.2S, DEC=41D 10' 28.92" +/- 0.2" but we will shift it on the CCD by 5" to the north and 5" to the east in order to avoid a close bright star. Visits Visit_Number:1 Visit_Requirements:PCS MODE F On_Hold_Comments: Visit_Comments: Exposure_Number:1 Target_Name:NGC224-G1 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:400S Special_Requirements:POS TARG 0.0,0.0 Exposure_Number:2 Target_Name:NGC224-G1 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:500S Special_Requirements:POS TARG 0.0,0.0 Exposure_Number:3 Target_Name:NGC224-G1 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:500S Special_Requirements:POS TARG 0.25047,-0.25047 Exposure_Number:4 Target_Name:NGC224-G1 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:600S Special_Requirements:POS TARG 0.25047,-0.25047 Visit_Number:2 Visit_Requirements:PCS MODE F On_Hold_Comments: Visit_Comments: Exposure_Number:1 Target_Name:NGC224-G177 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:1100S Special_Requirements:POS TARG 0.0,0.0 Exposure_Number:2 Target_Name:NGC224-G177 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:1300S Special_Requirements:POS TARG 0.0,0.0 Exposure_Number:3 Target_Name:NGC224-G177 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:1300S Special_Requirements:POS TARG 0.25047,-0.25047 Exposure_Number:4 Target_Name:NGC224-G177 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:1300S Special_Requirements:POS TARG 0.25047,-0.25047 Exposure_Number:5 Target_Name:NGC224-G177 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:1 Time_Per_Exposure:1300S Special_Requirements:POS TARG 0.25047,0.25047 Exposure_Number:6 Target_Name:NGC224-G177 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:1 Time_Per_Exposure:1300S Special_Requirements:POS TARG 0.25047,0.25047 Visit_Number:3 Visit_Requirements:PCS MODE F ORIENT 260D TO 280D On_Hold_Comments: Visit_Comments: A bright star nearby to be avoided by given orientation: offset angle of 45D and target position angle of 225D+/-10D Exposure_Number:1 Target_Name:NGC224-G170 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:1100S Special_Requirements:POS TARG 0.0,0.0 Exposure_Number:2 Target_Name:NGC224-G170 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:1300S Special_Requirements:POS TARG -0.25047,0.25047 Exposure_Number:3 Target_Name:NGC224-G170 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:1300S Special_Requirements:POS TARG 0.0,0.0 Exposure_Number:4 Target_Name:NGC224-G170 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters:CR-SPLIT=NO Number_of_Iterations:2 Time_Per_Exposure:1300S Special_Requirements:POS TARG -0.25047,0.25047 Data_Distribution ! 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