!__Proposal-Section__ !6133 ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 6133,v 7.1 1995/06/15 15:21:44 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 08:39:12 EST 1994 ! Proposal_Information ! Section 4 Title: The most massive stars in the Magellanic Clouds Proposal_Category: SNAP Scientific_Category: Hot Stars Cycle: 5 Investigators PI_name: Rolf-Peter Kudritzki PI_Institution: Universitaets-Sternwarte Muenchen CoI_Name: Daniel Lennon CoI_Institution: Universitaets-Sternwarte Muenchen Contact: Y ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) The analysis of high quality visual and uv (HST) spectrograms for a number of massive O-stars in the Magellanic Clouds has led to the conclusion that stellar masses for these objects may be as high as 200Msun . The radii and masses have been derived using apparent magnitudes determined from ground-based photometry and assuming that each object is single. Given the past history of supermassive stars (R136a for example) breaking up into multiple objects under the scrutiny of HST we propose obtaining high resolution images with WFPC2 for the most massive stars in our sample in order to verify that they are indeed single objects. If particular if singularity is confirmed for Sk-67 211 then we estimate that this object is the most massive star known. Questions ! Free format text (please update) Observing_Description: We plan to observe each object with WFPC2 and the F555W filter and using equation 6.1 of the WFPC2 handbook and allowing for the fact that one pixel in the PC detects a maximum of 20% of the total photons in the PSF the exposure time (2 seconds) is estimated to avoid saturating a 12th magnitude O-star (all targets are fainter than this). Thus the required space- craft times will essentially be overhead times (3 minutes per star). Also in view of the brevity of exposure times the observations may be carried out under gyro control and guide star acquisition is not required. No proprietary data rights are requested. Real_Time_Justification: Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number:1 Target_Name:SK-67D211 Alternate_Names:HDE269810,R122 Description:STAR,GIANT O Position:RA=05H 35M 13.921S +/- 0.50", DEC=-67D 33' 27.46" +/- 0.50", PLATE-ID=05ZW Equinox:2000.0 RV_or_Z:V=+303 Flux:V=12.28 B-V=-0.23 E(B-V)=0.10 Target_Number:2 Target_Name:SK-68D137 Alternate_Names: Description:STAR,GIANT O Position:RA=05H 38M 24.776S +/- 0.50", DEC=-68D 52' 32.81" +/- 0.50", PLATE-ID=05ZW Equinox:2000.0 RV_or_Z:V=+280 Flux:V=13.19 B-V=-0.19 E(B-V)=0.14 Target_Number:3 Target_Name:SK-66D172 Alternate_Names: Description:STAR,GIANT O Position:RA=05H 37M 05.588S +/- 0.50", DEC=-66D 21' 35.94" +/- 0.50" !PLATE-ID=06B0 Equinox:2000.0 RV_or_Z:V=+280 Flux:V=13.13 B-V=-0.12 E(B-V)=0.20 Target_Number:4 Target_Name:SK-67D166 Alternate_Names:HDE269698,R115 Description:STAR,SUPERGIANT O Position:RA=05H 31M 44.299S +/- 0.50", DEC=-67D 38' 01.02" +/- 0.50", PLATE-ID=05ZW Equinox:2000.0 RV_or_Z:V=+303 Flux:V=12.27 B-V=-0.22 E(B-V)=0.09 Target_Number:5 Target_Name:SK-67D167 Alternate_Names: Description:STAR,SUPERGIANT O Position:RA=05H 31M 51.984S +/- 0.50", DEC=-67D 39' 41.14" +/- 0.50", PLATE-ID=05ZW Equinox:2000.0 RV_or_Z:V=+280 Flux:V=12.54 B-V=-0.19 E(B-V)=0.12 Target_Number:6 Target_Name:SK-70D69 Alternate_Names: Description:STAR,MAIN SEQUENCE O Position:RA=05H 05M 18.769S +/- 0.50", DEC=-70D 25' 49.91" +/- 0.50", PLATE-ID=05ZW Equinox:2000.0 RV_or_Z:V=+280 Flux:V=13.90 B-V=-0.31 E(B-V)=0.02 Target_Number:7 Target_Name:AV488 Alternate_Names:GSC 9142 1855 Description:STAR,SUPERGIANT O Position:RA=01H 15M 58.838S +/- 0.50", DEC=-73D 21' 24.14" +/- 0.50", PLATE-ID=06B1 Equinox:2000.0 RV_or_Z: Flux:V=11.90 B-V=-0.13 U-B=-0.97 ! 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 ! 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