!__Proposal-Section__ !6123 ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 6123,v 2.1 1995/02/28 20:09:04 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 08:26:18 EST 1994 ! Proposal_Information ! Section 4 Title: Resolving the Luminous O III Lambda 5007 Sources in the Early-Types Galaxies of Virgo Proposal_Category: GO Scientific_Category: Interstellar Medium Cycle: 5 Investigators PI_name: Robin Ciardullo PI_Institution: The Pennsylvania State University CoI_Name: George Jacoby CoI_Institution: Kitt Peak National Observatory Contact: N ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) Observations of over 3000 planetary nebulae in the Local Group, M81, NGC 5128, and galaxies in Leo I, Coma I, Triangulum, Fornax, and Virgo show that the O III Lambda 5007 planetary nebula luminosity function has an extremely sharp cutoff at bright magnitudes. However, O III surveys of Virgo Cluster ellipticals have turned up 9 objects that are significantly brighter than this cutoff. While about half of these objects might be explained by the superposition of two, separate bright sources (optical doubling), the three most luminous objects are ~ 1 mag brighter than any planetary nebula discovered anywhere. We propose to image these over- luminous objects with the F502N filter and the Planetary Camera of the Hubble Space Telescope. If HST resolves these objects into H II regions, then we will have direct evidence of star formation in the early-type galaxies of Virgo. If HST does not resolve the sources, then we will be forced to conclude that either a young stellar population exists in the Virgo ellipticals, or that there exists, in addition to classical PN, a completely different population of O III Lambda 5007 sources. Questions ! Free format text (please update) Observing_Description: We are proposing to image 3 over-luminous O III Lambda 5007 sources in the Virgo Cluster with the F502N filter of the Planetary Camera. Despite being described as over-luminous, these objects are all extremely faint, with total O III Lambda 5007 fluxes of between 1.8 * 10^16 and 2.6 * 10^16 ergs cm^-2 s^-1. According to the WFPC2 Instrument Handbook (1994), these fluxes correspond to counts rates of between 370 and 540 counts per hour. Using the point spread functions and CCD characteristics given in the WFPC2 manual, we have created model image profiles for our O III Lambda 5007 sources. We find that we can reliably discriminate between a point source and a source that extends over 3 pixels (0sec point 14, or 10 pc at the distance of Virgo) with ~ 500 counts, and that resolving small structures becomes extremely difficult with less than 300 counts. (The background sky and galaxy were neglected in these models; however, these should be negligible in the narrow-band filter.) We therefore need approximately 2 orbits per object. Real_Time_Justification: None. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number:1 Target_Name:NGC4382-PN1 Alternate_Names: Description:EXT-MEDIUM, Planetary Nebula Position:RA=12H 22M 47.94S +/- 0.07S, DEC= 18D 25' 18.59" +/- 1.0" ! Most common specification format is ! RA=0H 0M 0.00S +/- 0S, ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:1950.0 RV_or_Z: RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux:V=25.2 +/- 0.1, B-V=1.0 +/- 0.2 ! Include at least V and B-V Comments: Target_Number:2 Target_Name:NGC4486-PN1 Alternate_Names: Description:EXT-MEDIUM, Planetary Nebula Position:RA=12H 28M 17.53S +/- 0.07S, DEC= 12D 37' 31.94" +/- 1.0" ! Most common specification format is ! RA=0H 0M 0.00S +/- 0S, ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:1950.0 RV_or_Z: RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux:V=25.6 +/- 0.1 , B-V=1.0 +/- 0.2 ! Include at least V and B-V Comments: Target_Number:3 Target_Name:NGC4406-PN1 Alternate_Names: Description:EXT-MEDIUM, Planetary Nebula Position:RA=12H 23M 41.28S +/- 0.07S, DEC= 13D 14' 17.09" +/- 1.0" ! Most common specification format is ! RA=0H 0M 0.00S +/- 0S, ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:1950.0 RV_or_Z: RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux:V=25.6 +/- 0.1, B-V=1.0 +/- 0.2 ! Include at least V and B-V 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 ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling ! PCS MODE [Fine | Gyro] ! GUIDing TOLerance ORIENT 140D TO 260D ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN