!_Proposal-Section__ !6134 ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 6134,v 28.1 1996/02/22 17:47:01 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: Christian Ready ! Phone: 410 338-4546 , E-mail: ready@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Date generated: Mon Dec 19 08:40:44 EST 1994 ! Proposal_Information ! Section 4 Title: Investigating the Nature of Circumstellar Material in Young Clusters Proposal_Category: GO Scientific_Category: Interstellar Medium Cycle: 5 Investigators PI_name: Elizabeth Lada PI_Institution: University of Maryland CoI_Name: Lee Mundy CoI_Institution: Univ. of Maryland Contact: ! Y or N (designate at most one contact) CoI_Name: Edward Shaya CoI_Institution: Univ. of Maryland Contact: ! Y or N (designate at most one contact) CoI_Name: John Stauffer CoI_Institution: Smithsonian Astrophyical Obs. Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) Recent studies of circumstellar nebulae associated with young stars in the Trapezium have illustrated the power of using HST to investigate the circumstellar environments of young stars in clusters. We propose to use WFPC2 to obtain sensitive broad band images of a sample of 4 young clusters associated with bright reflection nebulae. The primary goal of these observations is to search for evidence of circumstellar material around the young cluster members by looking for this material in 1.) absorption against the reflection nebulosity, 2.) in the reflected light of the cluster B star and 3.) in the reflected light of the young cluster stars themselves. The proposed HST data will be used in combination with near infrared and millimeter wavelength data to determine 1.) the frequency distribution of circumstellar material and disks in undisturbed young cluster environments, 2.) the size and mass distributions of circumstellar nebulae in clusters, and 3.) the correlation of such properties with stellar luminosity. Finally comparison of the results for the 5 clusters will allow us to explore the relative timescales for circumstellar evolution in young cluster stars and possibly constrain the timescales for planet formation in a cluster environment. Questions ! Free format text (please update) Observing_Description: This project requires the acquisition of images with a broad range of exposure times. Since the brightest stars in the target clusters are M_V ~ 9 while the characteristic surface brightnesses of the large-scale nebulae are in the range from 19.5 to 20.5 mag per arcsec^2, it is not possible to image the broad nebulosity without saturating the brighter cluster stars. The observations will be made toward a number of carefully selected positions in each cluster. These positions will be chosen to avoid the very brightest cluster stars (to minimize bleeding, diffraction spikes, and scattered light) yet to maximize the brightness of the extended reflection nebulosity and the concentration of young cluster stars. We have acquired, or will be acquiring, optical CCD, and near infrared images to assist in the selection of target positions. All the clusters were selected to be in regions where the contribution of background stars is minimized. This is an exploratory project in which we will utilize two different observing strategies. For one of our targets, we will acquire 0.4 second, 4 second and 40 second CR splits in the `Wide V' (F555W), and `Wide R' (F702W) filters. With these exposure times, stars dimmer approximately 16, 14 and 11 magnitudes will be unsaturated in the WF and can be compared with the point spread function to search extended emission. By comparing the color of the emission in the `Wide V' and `Wide R' filters we can calculate the color of marginally extended emission to confirm it is reflected light. In order to accomplish the goal of searching for circumstellar material in absorption against the extended nebulae and in reflected B-star light, we acquire deep integrations in the `Wide V' and `Wide R' filters. An average region in the general reflection nebulae has a surface brightness of 21 mag per arcsec^2 or 26 mag per pixel in the WF camera. For a total integration time of 1200 seconds (taken as three 400 second CR splits in spatial scan mode (3 dwell points)), we expect to obtain a final S/N ratio of 10. This calculation is based on a read noise of 5 electrons per pixel, an integration time of 200 seconds per sub-image and an average sky brightness of 22.5 mag per square arcsecond. Detections levels in this range are needed to reasonably image the absorption or emission shapes. The above observations for 2 fields in IC348 can be done in 4 orbits. Due to time constraints, a second less complete observing strategy will be used to sample 3 additional clusters in the remaining 4 orbits. In these clusters, we will obtain a 1200 sec integration in the `Wide V' filter, this time taken as two 600 sec CR splits in scan mode (2 dwell points). We also take a 40 sec CR split in the `Wide V' filter and a 200 sec CR split in the `Wide R'. The deep exposure will be used to search for absorption against background reflection nebulosity and for faint reflection nebulosity from any circumstellar material. The shorter `Wide V' observation is needed to search for reflection nebulosity around brighter stars that may be saturated in the longer exposures. The intermediate integrations in the `Wide R' will enable us to obtain colors for many of our target sources. The point of this second strategy is to enable us to search for circumstellar material in a number of clusters covering a range of ages and cluster environments. Nebula D WF Pixel B Star Max. S.B. (pc) (AU) M_V (mag/arcsec^2) NGC 1333 400 40 10.5 20.4 IC 348 350 35 8.5 20.1 NGC 2071 400 40 10.1 20.2 NGC 2068 400 40 10.6 19.5 Real_Time_Justification: Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number:1 Target_Name:IC348 Alternate_Names: Description:STELLAR CLUSTER Position:RA=3H 44M 34.421S +/- 0.1S, ! Most common specification format is DEC=32D 09' 43.89" +/- 1" Equinox:J2000 RV_or_Z: RA_PM: 0. ! Units are seconds of time per year Dec_PM: 0. ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux:SURF(V)=21 +/- 1 ! Include at least V and B-V Comments: Target_Number:2 Target_Name:NGC2068 Alternate_Names: Description:STELLAR CLUSTER Position:RA=5H 46M 45.99S +/- 0.1S, ! Most common specification format is DEC=00D 04' 00.04" +/- 1" Equinox:J2000 RV_or_Z: RA_PM: 0. ! Units are seconds of time per year Dec_PM: 0. ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: SURF(V)=21 +/- 1 ! Include at least V and B-V Comments: Target_Number:3 Target_Name:NGC2071 Alternate_Names: Description:STELLAR CLUSTER Position:RA=5H 47M 07.86S +/- 0.1S, ! Most common specification format is DEC=00D 17' 55.85" +/- 1" Equinox:J2000 RV_or_Z: RA_PM: 0. ! Units are seconds of time per year Dec_PM: 0. ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: SURF(V)=21 +/- 1 ! Include at least V and B-V Comments: Target_Number:4 Target_Name:NGC1333-NORTH Alternate_Names: Description: STELLAR CLUSTER Position:RA=3H 29M 19.770S +/- 0.1S, ! Most common specification format is DEC=31D 24' 49.98" +/- 1" Equinox:J2000 RV_or_Z: RA_PM: 0. ! Units are seconds of time per year Dec_PM: 0. ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: SURF(V)=21 +/- 1 ! Include at least V and B-V Comments: Northern bright star of NGC1333 field. Target_Number:5 Target_Name:NGC1333-SOUTH Alternate_Names: Description: STELLAR CLUSTER Position:RA=3H 29M 10.443S +/- 0.1S, ! Most common specification format is DEC=31D 21' 58.74" +/- 1" Equinox:J2000 RV_or_Z: RA_PM: 0. ! Units are seconds of time per year Dec_PM: 0. ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: SURF(V)=21 +/- 1 ! Include at least V and B-V Comments: Southern bright star of NGC1333 field. Scan_Data ! Appendix B Scan_Number: 1 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 3 Dwell_Secs: 400 Scan_Width: 0.0 Scan_Length: 1.202 Sides_Angle: 0.0 Number_Lines: 1 Scan_Rate: First_Line_PA: 45 Scan_Frame: S/C Length_Offset: Width_Offset: Scan_Number: 2 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 600 Scan_Width: 0.0 Scan_Length: 0.601 Sides_Angle: 0.0 Number_Lines: 1 Scan_Rate: First_Line_PA: 45 Scan_Frame: S/C Length_Offset: Width_Offset: ! 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: ORIENTation 80D TO 100D ! Section 7.1 On_Hold_Comments: Visit_Comments: Schedulers' note: Please leave some time (1-3 hours) after execution of this visit. The WFPC chips are really gonna get blasted by this bright target. Exposure_Number: 1 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 0.4S Exposure_Number: 2 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 0.4S Exposure_Number: 3 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 4.00S Exposure_Number: 4 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 4.00S Exposure_Number: 5 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 40.0S Exposure_Number: 6 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 40.0S Exposure_Number: 7 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,SCAN-READ=ALL,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure:400.00S Special_Requirements:SPATIAL SCAN 1 Exposure_Number: 8 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,SCAN-READ=ALL,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure:400.00S Special_Requirements:SPATIAL SCAN 1 !***************************************************************************** Visit_Number:2 Visit_Requirements: ORIENTation 260D to 280D ! Section 7.1 Visit_Comments: Same as Visit 01 but this time 180D away from Visit 01 Schedulers' note: Please leave some time (1-3 hours) after execution of this visit. The WFPC chips are really gonna get blasted by this bright target. Exposure_Number: 1 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 0.4S Exposure_Number: 2 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 0.4S Exposure_Number: 3 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 4.00S Exposure_Number: 4 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 4.00S Exposure_Number: 5 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 40.0S Exposure_Number: 6 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 40.0S Exposure_Number: 7 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,SCAN-READ=ALL,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure:400.00S Special_Requirements:SPATIAL SCAN 1 Exposure_Number: 8 ! Section 6.5 Target_Name:IC348 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,SCAN-READ=ALL,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure:400.00S Special_Requirements:SPATIAL SCAN 1 !********************************************************************** Visit_Number:3 Visit_Requirements: Visit_Comments: Schedulers' note: Please leave some time (1-3 hours) after execution of this visit. The WFPC chips are really gonna get blasted by this bright target. Exposure_Number: 1 Target_Name:NGC2068 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 40.0S Exposure_Number: 2 ! Section 6.5 Target_Name:NGC2068 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure: 200.00S Exposure_Number: 3 ! Section 6.5 Target_Name:NGC2068 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,SCAN-READ=ALL,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure:600.00S Special_Requirements:SPATIAL SCAN 2 !********************************************************************* Visit_Number:4 Visit_Requirements: Visit_Comments: Schedulers' note: Please leave some time (1-3 hours) after execution of this visit. The WFPC chips are really gonna get blasted by this bright target. Exposure_Number: 1 Target_Name:NGC2071 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 40.0S Special_Requirements: Exposure_Number: 2 ! Section 6.5 Target_Name:NGC2071 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure: 200.00S Special_Requirements: Exposure_Number: 3 ! Section 6.5 Target_Name:NGC2071 Config:WFPC2 Opmode:IMAGE Aperture:PC1-FIX Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,SCAN-READ=ALL,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure:600.00S Special_Requirements:SPATIAL SCAN 2 !******************************************************************** Visit_Number:5 Visit_Requirements:!ORIENT 220D TO 230D ! Section 7.1 Visit_Comments: Schedulers' note: Please leave some time (1-3 hours) after execution of this visit. The WFPC chips are really gonna get blasted by this bright target. Exposure_Number: 1 ! Section 6.5 Target_Name:NGC1333-NORTH Config:WFPC2 Opmode:IMAGE Aperture:WF3 Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 40.0S Special_Requirements: Exposure_Number: 2 ! Section 6.5 Target_Name:NGC1333-NORTH Config:WFPC2 Opmode:IMAGE Aperture:WF3 Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure: 200.00S Special_Requirements: Exposure_Number: 3 ! Section 6.5 Target_Name:NGC1333-NORTH Config:WFPC2 Opmode:IMAGE Aperture:WF3 Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,SCAN-READ=ALL,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure:600.00S Special_Requirements:SPATIAL SCAN 2 !******************************************************************** Visit_Number:6 Visit_Requirements:ORIENT 130D TO 140D ! Section 7.1 Visit_Comments: Schedulers' note: Please leave some time (1-3 hours) after execution of this visit. The WFPC chips are really gonna get blasted by this bright target. Exposure_Number: 1 ! Section 6.5 Target_Name:NGC1333-SOUTH Config:WFPC2 Opmode:IMAGE Aperture:WF2 Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF Number_of_Iterations:1 Time_Per_Exposure: 40.0S Special_Requirements: Exposure_Number: 2 ! Section 6.5 Target_Name:NGC1333-SOUTH Config:WFPC2 Opmode:IMAGE Aperture:WF2 Sp_Element:F702W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure: 200.00S Special_Requirements: Exposure_Number: 3 ! Section 6.5 Target_Name:NGC1333-SOUTH Config:WFPC2 Opmode:IMAGE Aperture:WF2 Sp_Element:F555W Wavelength: Optional_Parameters:ATD-GAIN=7,CR-SPLIT=DEF,SCAN-READ=ALL,CLOCKS=YES Number_of_Iterations:1 Time_Per_Exposure:600.00S Special_Requirements:SPATIAL SCAN 2 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, ! University of Maryland, ! College Park, MD 20742 ! ! 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