!__Proposal-Section__ !6136 ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 6136,v 7.1 1995/08/23 15:09:21 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. ! Name of Phase I Proposal: mignani-193.prop ! Date generated: Mon Dec 19 08:42:53 EST 1994 ! Proposal_Information ! Section 4 Title: Positioning and proper motion measurement of the PSR0656+14 optical counterpart. Proposal_Category: GO Scientific_Category: Hot Stars Cycle: 5 Investigators PI_name: Roberto Mignani PI_Institution: Universita degli Studi di Milano and Istituto di Fisica Cosmica del CNR CoI_Name: Giovanni F. Bignami CoI_Institution: Istituto di Fisica Cosmica del CNR Contact: ! Y or N (designate at most one contact) CoI_Name: Patrizia A. Caraveo CoI_Institution: Istituto di Fisica Cosmica del CNR Contact: ! Y or N (designate at most one contact) CoI_Name: Sandro Mereghetti CoI_Institution: Istituto di Fisica Cosmica del CNR Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) PSR0656+14, is one of the few radio pulsars for which an optical counterpart has been proposed. Two ground based ESO (1989 and 1991) observations detected a m_V ~ 25 object at the radio position. This detection seems confirmed by the HST/FOC and by EUVE data. We now propose to image the field of PSR0656+14 with the PC to perform very accurate relative astrometry of the suggested optical counterpart, both as a reference for future observations, and in order to compare its present position with those measured in our 1989 and 1991 frames. Since the radio pulsar exhibits a proper motion towards the SE of ~ 70 mas /year, the corresponding angular displacement of the optical counterpart over 6 years (>= 0sec point 4) could be measurable. If observed, this will confirm the proposed identification, and yield interesting constraints on the emission mechanism(s), expecially in comparison with EUVE and X-ray data. Questions ! Free format text (please update) Observing_Description: We plan to do deep imaging of the region around PSR0656+14 in order to position accurately the candidate counterpart. To estimate the exposure time needed to detected our target (m_V <= 25) we take advantage of the experience wa have now gathered during Cycle 4 with the program 5484 focussed on the Geminga optical counterpart, a target of comparable brightness. In order to clearly detect such a faint target with the PC and reduce contamination from cosmic ray hits 6 images of 7-800 secs are required, split in two exposures per orbit, to fulfill our science goal with the necessary overheads. We choose the F555W filter since the target has been observed close to this passband from the ground. Real_Time_Justification: Our previous ground based observations represent the only accurate reference both to the target position in the PC field and to sufficient nearby stars. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: STAR-065948+141421 Alternate_Names: PSR0656+14 Description: STAR,NEUTRON STAR Position: RA=6H 59M 48.12S +/- 0.001S, DEC=14D 14' 29.53" +/- 0.01" !PLATE-ID=02UU Equinox: J2000 RV_or_Z: RA_PM: 0.0044 ! Units are seconds of time per year Dec_PM: -0.028 ! Units are seconds of arc per year Epoch: J1995.03 Annual_Parallax: Flux: V=25 ! 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: 01 Visit_Requirements: ORIENTation 45.0D TO 45.0D ! Section 7.1 ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling PCS MODE F ! GUIDing TOLerance ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN