Jan. 12, 2005205 th AAS Meeting, San Diego The HST Survey of the Orion Nebula Cluster Science team:...
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Transcript of Jan. 12, 2005205 th AAS Meeting, San Diego The HST Survey of the Orion Nebula Cluster Science team:...
Jan. 12, 2005 205th 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, 2005 205th 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 ~10MJ
• Ha survey of disks, jets, proplyds
Jan. 12, 2005 205th AAS Meeting, San Diego
Strategy
104 HST orbits, parallel ACS+WFPC2+NIC3• ACS: B s, V s, I s, z s, Hs• 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, 2005 205th AAS Meeting, San Diego
Survey areaCurrent on 2-Mass
final on ESO-WFI
•ACS & WFP2: ~0.15sq. deg; NIC3~113-127 sq.arcmin•WFPC2: 205.4 Mpix•ACS: 904 Mpix•NIC-3: 7.4-8.3 Mpix
Jan. 12, 2005 205th AAS Meeting, San Diego
NICMOSFOM increases area surveyedby 1.6. Factor ~2 possible.
Galaxies in NICMOS fields
Jan. 12, 2005 205th AAS Meeting, San Diego
Two populations: • J~12-14 (M type stars)• J~18-22 (background objects)
NIC-3 photometry
Jan. 12, 2005 205th AAS Meeting, San Diego
Ground-based follow-up
• Simultaneous UBVIJHK photometry of the ONC– ISPI @ CTIO Blanco 4m: JHK– WFI @ 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)