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An Overview of the HST Treasury Program on the Orion Nebula

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Presentation on theme: "An Overview of the HST Treasury Program on the Orion Nebula"— Presentation transcript:

1 An Overview of the HST Treasury Program on the Orion Nebula
Massimo Robberto Space Telescope Science Institute 12/30/2018 Washington DC

2 Co-Investigators Science team: Home team:
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) 12/30/2018 Washington DC

3 Orion Nebula and its Cluster
basic facts Orion Nebula and its Cluster The closest star forming region containing the entire spectrum of stellar masses. Cornerstone for understanding how stars form. GO10246: HST Treasury Project on Orion 104 orbits. The largest Hubble program ever dedicated to star formation All cameras onboard HST used in parallel (ACS, WFPC2, NICMOS). 9 filters from ultraviole to infrared ACS release image of the Orion Nebula 33,000 x 36,000 pixels, 5 colors, the most detailed image of Orion ever made 12/30/2018 Washington DC

4 1. The Orion Nebula and its Cluster (ONC)
10 arcmin 1 pc (b) 2Mass JHK color composite 12/30/2018 Washington DC

5 The Orion Nebula Cluster
Hillenbrand 1997 spectral types for ~1000 stars V, I photometry down to [I]~18m and [V]~21m for ~1500 stars. This survey is complete down to 1.0M and samples masses at the H-burning limit (MH~0.075M) 12/30/2018 Washington DC

6 Observational challenges
Photometric errors (non-uniform sky, circumstellar matter, disk, jets…) Binary companions Variability Spectral type uncertainties Color terms between different photometric systems Photosphere template uncertainties Bolometric correction Anomalous extinction Distance Need for deep, multiband, simultaneous, high precision photometry to assemble the richest, most accurate, unbiased HR diagram of PMS stars ever made 12/30/2018 Washington DC

7 The HST survey of the Orion Nebula Cluster
HST GO program 10246 Treasury program: The HST survey of the Orion Nebula Cluster 104 HST orbits, parallel ACS +WFPC2 +NIC3 ACS: B (420s), V (385s), I (385s), z (385s), Ha (340s) WFPC-2: U (2400s), B (80s), I (10s), Ha (400s) NIC-3: J (5256s), H (4192s) 2 Orientations 100° (35 orbits, Fall 2004) 280° (69 orbits, Spring 2005) Precise tiling pattern allows for full coverage with ACS and WFPC2 12/30/2018 Washington DC

8 ACS release 12/30/2018 Washington DC

9 A typical ACS visit F658N F850LP F775W F555W Released image F435W
12/30/2018 Washington DC

10 The largest atlas of Pre-Main-Sequence stars (~3200)
12/30/2018 Washington DC

11 Known proplyds, disks and jets in the Trapezium region
12/30/2018 Washington DC

12 Young stellar objects in the Nebula outskirts
12/30/2018 Washington DC

13 Binaries 12/30/2018 Washington DC

14 Galaxies 12/30/2018 Washington DC

15 PSF subtraction reveals close binary companions
Companion is 0.45" from the primary, flux ratio ~6 mag I band 12/30/2018 Washington DC

16 The Orion Nebula Cluster
Orion cluster, HR diagram (Hillenbrand 1997) M43 region, Color-Magnitude diagram (HST Treasury Program) 12/30/2018 Washington DC

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