Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5064c Report Date: 09-May-96:20:22 Version: ********** Check-in Date: ********** 1.Proposal Title: DIAGNOSTIC OF EARLY STELLAR EVOLUTION: SEARCH FOR PRE-MAIN SEQUENCE STARS AND DETERMINATION OF THEIR ABSOLUTE ORBITS-FIXED ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR POPULATION GO/DD 5 Long Term yrs 3688 Sub Category ASTROMETRY ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Prof. Pierluigi L. Bernacca DEPARTMENT OF ASTRONOMY OF T ITALY 39-424-462665 ASSOCIATE PROFESSOR ------------------------------------------------------------------------------------ 7. Abstract Searching for binary and multiple stars among pre-main-sequence objects and determining their orbits and masses are necessary for a breakthrough in our knowledge of the star formation process. First priority targets may be advantageously selected from the observing program of the ESA HIPPARCOS satellite. HIPPARCOS will provide high precision individual parallaxes to distances of 150 pc and significantly improved group parallaxes to 500 pc. Added on targets will be the few binaries detected by lunar occultations, in the separation range 10 to 570 milliarcseconds (mas). We are proposing to perform astrometric measurements of 5 T Tauri stars and 5 Ae/Be Herbig objects, by means of the HST Fine Guidance Sensor (FGS) in the TRANS mode. The FGS will unveil their possible duplicity in the range 0".1 down to 10 mas. From FGS measured orbits, period and eccentricity distributions will be derived, and via accurate parallaxes the sum of the masses can be directly determined. The HST FGS is unique for carrying out the proposed research insofar lunar occultations are not generally available and provide angular separation in the occultation direction only; speckle interferometry is severely limited in angular resolution for large magnitude differences between the binary components. These observations will also serve as critical test cases for the HIPPARCOS double stars reductions. This is a Long-Term proposal. DELETED LINES 1,3,4,6-11 FROM 3688 TO CREATE THIS PROPOSAL ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 4.97 par: 0 10. Num targs pri: 11 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FGS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5064c PI: Prof. Pierluigi L. Bernacca Proposal Title: DIAGNOSTIC OF EARLY STELLAR EVOLUTION: SEARCH FOR PRE-MAIN SEQUENCE STARS AND DETERMINATION OF THEIR ABSOLUTE ORBITS-FIXED ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Prof. Guido A. Barbaro DIPARTIMENTO DI ASTRONOMIA ITALY X DELL'UNIVERSITA' DI PADOVA Dr. Ulrich Bastian ASTRONOMISCHEN RECHEN-INSTITUT GERMANY X Dr. Beatrice Bucciarelli SPACE TELESCOPE SCIENCE USA X INSTITUTE Dr. Mario G. Lattanzi SPACE TELESCOPE SCIENCE USA X INSTITUTE Dr. Renato Pannunzio OSSERVATORIO ASTRONOMICO DI ITALY X TORINO Dr. Massimo Badiali ISTITUTO DI ASTROFISICA SPAZIALE ITALY X DEL CNR, FRASCATI Prof. Augusto Mammano UNIVERSITA' DI MESSINA ITALY X ------------------------------------------------------------------------------------ 11. Address Information Name: PIERLUIGI L. BERNACCA Category: PI Institution: ASTRONOMY DEPARTMENT OF THE UNIVE Address: OSSERVATORIO ASTROFISICO City: ASIAGO-VI State: Zip Code: 36012 Country: ITALY Telephone: 39-424-462665 Telex (or e-mail): 430111 SETOUR,I ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5064c [ 3] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 2 20160 A,156 RA= 04H 19M 15.829S +/- 2000 1 V= 10.9 +/- 0.5 HD281934 BP- 0.07S, 2 B-V= 1.3 +/- 0.5 TAU DEC= +29D 6' 27.25" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 5 53444 A,116 RA= 10H 55M 58.951S +/- 2000 1 V= 9.46 +/- 0.24 HD94878 GG- 0.07S, 2 B-V= -0.16 +/- 0.33 CAR DEC= -60D 23' 33.62" +/- 1" Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J 2000.00 -0.0005 +/- 0.0000 0.0000 +/- 0.0000 0.0000 +/- 0.0000 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5064c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 2 20160 FGS TRANS 3 F550W SCANS=9 1 8.33M CYCLE 2 STEP-SIZE=0.6 Comments: IF ST SCI MUST MOVE THE TARGET MORE THAN 5 ARCSECS FROM THE DEFAULT OF POSTARG =(0,0), PLEASE NOTIFY CONTACT ------------------------------------------------------------------------------------------------------------------------------------ 5 53444 FGS TRANS 3 F550W SCANS=9 1 14.38M CYCLE 2 STEP-SIZE=0.6 Comments: IF ST SCI MUST MOVE THE TARGET MORE THAN 5 ARCSECS FROM THE DEFAULT OF POSTARG =(0,0), PLEASE NOTIFY CONTACT ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5064c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes TRANS ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCANS=9 STEP-SIZE=0.6 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO/DD ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 4.97 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATION ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ASTROMETRY ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F550W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 20160 HD281934 BP-TAU 53444 HD94878 GG-CAR ------------------------------------------------------------------------------------------------------------------------------------