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TOPIC: Barnard 5 region

Blobrana

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Posts: 131433

Date: Feb 12 22:27 2015

Barnard 5 multiple-star system	Permalink

Astronomers catch 'Tatooine' multiple-star system as it forms For the first time astronomers have caught a multiple-star system as it is created, and their observations are providing new insight into how such systems, and possibly the solar system, are formed. Amazing images taken from a series of telescopes on Earth show clouds of gas which are in the process of developing into stars. Scientists from The University of Manchester, Liverpool John Moores University and other institutes in Europe and around the world, looked at a cloud of gas some 800 light-years from Earth, homing in on a core of gas that contains one young protostar and three dense pockets of matter that they say will collapse into stars over the next 40,000 years. Of the eventual four stars, the astronomers predict that three may become a stable triple-star system. The findings are published today in the journal Nature. Read more __________________

Blobrana

L

Posts: 131433

Date: Jun 28 08:36 2011

Barnard 5 region	Permalink

Title: EVLA Observations of the Barnard 5 Star-Forming Core: Embedded Filaments Revealed Authors: Jaime E. Pineda (1 and 2), Alyssa A. Goodman (3), Héctor G. Arce (4), Paola Caselli (5), Steven Longmore (1), Stuartt Corder (6 and 7) ((1) ESO, (2) UK ARC Node, University of Manchester, (3) Harvard-Smithsonian CfA, (4) Yale University, (5) University of Leeds, (6) NAASC, (7) NRAO) We present a ~6.5'x8' Expanded Very Large Array (EVLA) mosaic observations of the NH3 (1,1) emission in the Barnard 5 region in Perseus, with an angular resolution of 6". This map covers the coherent region, where the dense gas presents subsonic non-thermal motions (as seen from single dish observations with the Green Bank Telescope, GBT). The combined EVLA and GBT observations reveal, for the first time, a striking filamentary structure (20" wide or 5,000 AU at the distance of Perseus) in this low-mass star forming region. The integrated intensity profile of this structure is consistent with models of an isothermal filament in hydrostatic equilibrium. The observed separation between the B5-IRS1 young stellar object (YSO), in the central region of the core, and the northern starless condensation matches the Jeans length of the dense gas. This suggests that the dense gas in the coherent region is fragmenting. The region observed displays a narrow velocity dispersion, where most of the gas shows evidence for subsonic turbulence, and where little spatial variations are present. It is only close to the YSO where an increase in the velocity dispersion is found, but still displaying subsonic non-thermal motions Read more (330kb, PDF) __________________

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