2013A&A...558A.119K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST03:04:41

2013A&A...558A.119K - Astronomy and Astrophysics, volume 558A, 119-119 (2013/10-1)

Radiatively driven Rayleigh-Taylor instability candidates around a forming massive star system. NACO adaptive optics and VISIR study of G333.6-0.2.

KUMAR M.S.N.

Abstract (from CDS):

The formation of the highest mass stars are thought to be dominated by instabilities resulting from gravitation and radiation. Instabilities due to gravitation are commonly demonstrated by observations of fragmentation, but those due to effects of radiation have thus far not been found. Here I report on the NACO adaptive optics and mid-infrared diffraction-limited VISIR imaging data of an extemely luminous ultra-compact HII region G333.6-0.2. Two infrared sources, one bright in the near-infrared (appearing point-like) and another in the mid-infrared (resolved with an elliptical shape) are uncovered through this data, which are located at the heart of this region. These infrared sources appear to be embedded in the waist of a bipolar-shaped nebula and UCHII region, the lobes of which are separated by a dark patch. Dense filamentary features with finger/hook morphology are found; they appear to be connected to the two bright infrared sources and the sizes of these hook features are sharply limited to <5000AU. The observed properties of this target and a large amount of previous data obtained from the literature are compared together with the results of various numerical simulations of high-mass star formation. This comparison favours the interpretation that the finger/hook-like structures likely represent radiatively driven Rayleigh-Taylor instabilities arising in the outflow cavity of a forming high-mass binary star system.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: massive - HII regions

CDS comments: In Simbad MSX5C G333.6046-00.2124 is IRS1+IRS2 (fig.3).

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2201 0
2 GAL 332.80-00.60 HII 16 19 47 -51 04.1           ~ 92 1
3 MSX5C G333.6046-00.2124 IR 16 22 09.450 -50 05 58.09           ~ 4 0
4 SNR G333.6-00.2 HII 16 22 11 -50 05.6           ~ 140 0
5 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11540 0
6 GAL 005.88-00.41 HII 18 00 30.388 -24 04 00.20           ~ 296 0
7 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 409 2
8 NAME Cyg Complex reg 20 32 +45.0           ~ 520 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-03:04:41

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