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20 April 2024 |
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Diffraction-limited Visible Light Images of Orion Trapezium Cluster With the Magellan Adaptive Secondary AO System (MagAO) | | L.M. Close
; J.R. Males
; K. Morzinski
; D. Kopon
; K. Follette
; T.J. Rodigas
; P. Hinz
; Y-L. Wu
; A. Puglisi
; S. Esposito
; A. Riccardi
; E. Pinna
; M. Xompero
; R. Briguglio
; A. Uomoto
; T. Hare
; | | Date: |
19 Aug 2013 | | Abstract: | We utilized the new high-order (250-378 mode) Magellan Adaptive Optics system
(MagAO) to obtain very high spatial resolution observations in "visible light"
with MagAO’s VisAO CCD camera. In the good-median seeing conditions of Magellan
(0.5-0.7") we find MagAO delivers individual short exposure images as good as
19 mas optical resolution. Due to telescope vibrations, long exposure (60s) r’
(0.63 micron) images are slightly coarser at FWHM=23-29 mas (Strehl ~28%) with
bright (R<9 mag) guide stars. These are the highest resolution filled-aperture
images published to date. Images of the young (~1 Myr) Orion Trapezium Theta 1
Ori A, B, and C cluster members were obtained with VisAO. In particular, the 32
mas binary Theta 1 Ori C1/C2 was easily resolved in non-interferometric images
for the first time. Relative positions of the bright trapezium binary stars
were measured with ~0.6-5 mas accuracy. We now are sensitive to relative proper
motions of just ~0.2 mas/yr (~0.4 km/s at 414 pc) - this is a ~2-10x
improvement in orbital velocity accuracy compared to previous efforts. For the
first time, we see clear motion of the barycenter of Theta 1 Ori B2/B3 about
Theta 1 Ori B1. All five members of the Theta 1 Ori B system appear likely a
gravitationally bound "mini-cluster", but we find that not all the orbits can
be both circular and co-planar. The lowest mass member of the Theta 1 Ori B
system (B4; mass ~0.2 Msun) has a very clearly detected motion (at 4.1+/-1.3
km/s; correlation=99.9%) w.r.t B1 and will likely be ejected in the future.
This "ejection" process of the lowest mass member of a "mini-cluster" could
play a major role in the formation of low mass stars and brown dwarfs.(slightly
abridged abstract) | | Source: | arXiv, 1308.4155 | | Services: | Forum | Review | PDF | Favorites | |
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