Tangential Velocities of Objects in the Orion Nebula and Locating the Embedded Outflow Sources.

Details Tangential Velocities of Objects in the Orion Nebula and Locating the Embedded Outflow Sources. Tangential Velocities of Objects in the Orion Nebula and Locating the Embedded Outflow Sources.

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10921o&link_type=abstract

HST Proposal ID #10921. Cycle 15

Physics

Scientific paper

The Orion Nebula is arguably the Rosetta Stone for studying a very young star cluster and how the radiation and outflowing plasma from its stars interact with ambient material. It has been the subject of numerous HST imaging studies, which means that there is good opportunity for determining tangential velocities by obtaining second epoch images during Cycle 15, which may be the last cycle for which the WFPC2 is available. These velocities in the plane-of-the-sky will allow us to determine the patterns of outflow from micro-jets smaller than the Solar System to jet driven shocks more than a parsec from their sources. Combined with radial velocities, we'll obtain spatial velocities, which are critical to determining where the embedded sources are located that produce the numerous HH objects coming from the Orion-S and BN-KL regions. We'll also be able to determine the physics that is operating in the LL Ori type of outflows where a bipolar jet is being distorted by a slow wind coming from the nebula. We will also be able to search for runaway stars caused by the disintegration of young multiple-star systems. All of this is possible because the long-time base of the WFPC2 and ACS observations allow a new level of astrometric precision to be obtained and to be done efficiently by making coordinated parallel observations with all images.

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