Jan. 12, th AAS Meeting, San Diego The HST Survey of the Orion Nebula Cluster Science team: M. Robberto (ESA-STScI), D. Soderblom (STScI), C. R. O’Dell (Vanderbilt), L. A. Hillenbrand (Caltech), M. Simon (Stony Brook), E. D. Feigelson (Penn State), J. Najita (NOAO), K. G. Stassun (Vanderbilt), J. Stauffer (IPAC-Caltech), M. Meyer (Steward), J. Krist (JPL), N. Panagia (STScI), M. Romaniello (ESO), F. Palla (Arcetri), I.N. Reid (STScI), P. McCullough (STScI), R. Makidon (STScI) Home team: E. Bergeron (STScI), M. McMaster (STScI), V. Kozhurina-Platais (STScI), H. McLaughlin (STScI), K. Smith (STScI), W. Sherry (NOAO)

Jan. 12, th AAS Meeting, San Diego Goals Use deep, simultaneous, high precision photometry to assemble the richest, most accurate, unbiased HR diagram of PMS stars ever made –IMF and its variation with environment –Accretion and disk dissipation vs. environment –Stellar multiplicity vs. disk fraction Discover substantial population of PMS binaries, low mass stars and brown dwarfs down to ~10M J Ha survey of disks, jets, proplyds

Jan. 12, th AAS Meeting, San Diego Strategy 104 HST orbits, parallel ACS+WFPC2+NIC3 ACS: B  s , V  s , I  s , z  s , H  s  WFPC-2: U  s , B  s , I  s , H   s  NIC-3: J  s , H  s  2 Orientations 100° (36 orbits, Fall 2004) 280° (68 orbits, Spring 2005) Precise tiling pattern allows for full coverage with ACS and WFPC2

Jan. 12, th AAS Meeting, San Diego Survey area Current on 2-Mass final on ESO-WFI ACS & WFP2: ~0.15sq. deg; NIC3~ sq.arcmin WFPC2: Mpix ACS: 904 Mpix NIC-3: Mpix

Jan. 12, th AAS Meeting, San Diego An ACS strip B, H  -V, I

Jan. 12, th AAS Meeting, San Diego

Jan. 12, th AAS Meeting, San Diego

Jan. 12, th AAS Meeting, San Diego WFPC2 HH

Jan. 12, th AAS Meeting, San Diego NICMOS FOM increases area surveyed by  1.6. Factor ~2 possible. Galaxies in NICMOS fields

Jan. 12, th AAS Meeting, San Diego F435W F555W F775W F850LP F658N ACS+NICMOS

Jan. 12, th AAS Meeting, San Diego NIC3

Jan. 12, th AAS Meeting, San Diego Two populations: J~12-14 (M type stars) J~18-22 (background objects) NIC-3 photometry

Jan. 12, th AAS Meeting, San Diego CM diagrams: V vs. V-I

Jan. 12, th AAS Meeting, San Diego CM diagrams: I vs. I-z

Jan. 12, th AAS Meeting, San Diego Stellar density

Jan. 12, th AAS Meeting, San Diego Star counts – I band

Jan. 12, th AAS Meeting, San Diego Ground-based follow-up Simultaneous UBVIJHK photometry of the ONC CTIO Blanco 4m: JHK ESO 2.2m: UBVI+Ha Plus CTIO 0.9m, data taken on Jan 1-2, 2005 Optical Multi-object spectroscopy (Hillenbrand) Near-IR spectroscopy (Meyer)

Jan. 12, th AAS Meeting, San Diego A look at the core region

Jan. 12, th AAS Meeting, San Diego New objects in the outer regions V H 