! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6525,v 7.1 1996/04/02 15:02:05 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6525,v 7.1 1996/04/02 15:02:05 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-0363.bignami.prop ! Date generated: Fri Dec 22 15:57:34 EST 1995 ! Proposal_Information ! Section 4 Title: The B/UV Colors of Geminga Suggest Spectral Feature on Hot Continuum. Proposal_Category: GO Scientific_Category: HOT STARS Cycle: 6 Investigators PI_name: Giovanni F. Bignami PI_Institution: Istituto di Fisica Cosmica del CNR CoI_Name: Patrizia A. Caraveo CoI_Institution: Istituto di Fisica Cosmica del CNR Contact: ! Y or N (designate at most one contact) CoI_Name: Roberto P. Mignani CoI_Institution: Istituto di Fisica Cosmica del CNR Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) Among middle age neutron stars, Geminga is, no doubt, the best studied. Many years of efforts aimed at the identification of the optical counterpart of the X/Gamma ray source yielded the I,R,V,B and more recently F555W and F342W colors of G". When plotted in a flux vs wavelength diagram, the colors of G" do not appear to follow completely a planckian distribution. While the F342W and B fluxes, as well as I upper limit, lie on the extrapolation of the planckian measured by EUVE and ROSAT, the F555W, V and R appear to be well above it. In fact, they seem to define a spectral feature superimposed on the thermal emission. This is the first observational evidence of a spectral feature on an Isolated Neutron Star and as such is in need of confirmation. Aim of this proposal is to provide this by better constraining the underlying planckian, measuring the flux of Geminga with filters F430W and F275W. While F275W would be a new piece of information, the F430W will allow a cross check of the difficult and uncertain B point, measured from the ground to be 26.5. Questions ! Free format text (please update) Observing_Description: To estimate the exposure times we used FOCSIM and our previous FOC observation of Geminga, gathered during Cycle 4. According to FOCSIM, exposure times of 5400 and 5000 sec in the F430W and F275W filters, respectively, should be adequate to detect the target with a S/N 30. Therefore, we ask for two exposures: one of 5400 sec. (F430W filter) and the other of 5000 sec (F275W filter). These observations, split in shorter chunks to minimize cosmic rays contamination, should cover five orbits. Real_Time_Justification: Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 01 Target_Name: STAR-0633-1746 Alternate_Names: GEMINGA Description: STAR,NEUTRON STAR Position: ! Most common specification format is RA=6H 33M 54.13S +/- 0.0006S, ! RA=0H 0M 0.00S +/- 0S, DEC=17D 46' 12.56" +/- 0.1" ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox: J2000 RV_or_Z: RA_PM: 0.01 ! Units are seconds of time per year Dec_PM: 0.109 ! Units are seconds of arc per year Epoch: 1994.03 Annual_Parallax: 0.006 Flux: V=25.5,B-V=1 ! 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: ! 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 ! DROP TO GYRO IF NECESSARY [NO REACQuisition] ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! SCHEDulability ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN