Orion Nebula - Astronomy News

Blobrana

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Posts: 131433

Date: Mar 21 11:36 2017

RE: Orion Nebula	Permalink

Title: Which Stars are Ionizing the Orion Nebula ? Author: C. R. O'Dell, W. Kollatschny, G. J. Ferland The common assumption that Theta-1-Ori C is the dominant ionizing source for the Orion Nebula is critically examined. This assumption underlies much of the existing analysis of the nebula. In this paper we establish through comparison of the relative strengths of emission lines with expectations from Cloudy models and through the direction of the bright edges of proplyds that Theta-2-Ori-A, which lies beyond the Bright Bar, also plays an important role. Theta-1-Ori-C does dominate ionization in the inner part of the Orion Nebula, but outside of the Bright Bar as far as the southeast boundary of the Extended Orion Nebula, Theta-2-Ori-A is the dominant source. In addition to identifying the ionizing star in sample regions, we were able to locate those portions of the nebula in 3-D. This analysis illustrates the power of MUSE spectral imaging observations in identifying sources of ionization in extended regions. Read more (1334kb, PDF) __________________

Blobrana

L

Posts: 131433

Date: Mar 17 23:02 2017

Kleinmann-Low Nebula	Permalink

Hubble Discovery of Runaway Star Yields Clues to Breakup of Multiple-Star System in a nebula far, far away, a cluster of stars was waging a real-life star wars, with the stellar members battling each other for supremacy in the Orion Nebula. The gravitational tussle ended with the system breaking apart and at least three stars being ejected in different directions. Astronomers spotted two of the speedy, wayward stars over the past few decades. They traced both stars back 540 years to the same location and suggested they were part of a now-defunct multiple-star system. But the duo's combined energy, which is propelling them outward, didn't add up. The researchers reasoned there must be at least one other culprit that robbed energy from the stellar toss-up. Now NASA's Hubble Space Telescope has helped astronomers find the final piece of the puzzle by nabbing a third runaway star, which was a member of the same system as the two previously known stars. The stars reside in a small region of young stars called the Kleinmann-Low Nebula, near the center of the vast Orion Nebula complex, located 1,300 light-years from Earth. Read more __________________

Blobrana

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Posts: 131433

Date: Mar 16 21:29 2017

RE: Orion Nebula	Permalink

The Orion nebula captured with a 100mm f5 Helios achromatic refractor and Canon EOS 350. __________________

Blobrana

L

Posts: 131433

Date: Jan 18 00:12 2017

	Permalink
The Orion nebula captured with a 100mm f5 Helios refractor and Canon EOS350D. Motorised EQ1 Mount. __________________

Blobrana

L

Posts: 131433

Date: Jan 17 22:36 2017

	Permalink
The Orion nebula captured with a 100mm f5 Helios refractor and Canon EOS350D. __________________

Blobrana

L

Posts: 131433

Date: Jan 13 15:40 2017

Orion nebula 12.01.17

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Image of the Orion nebula captured with a 100mm f5 Helios refractor and Canos EOS350D. Motorised EQ1 Mount.

Prime focus.

Clear. Moderate seeing. Full moon

Processed in Paint Shop Pro.

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Blobrana

L

Posts: 131433

Date: Jan 13 11:25 2017

Orion Trapezium	Permalink

Title: On the dynamical evolution of the Orion Trapezium Author: C. Allen, R. Costero, A. Ruelas-Mayorga, L. J. Sánchez We discuss recent observational data on the transverse and radial velocities, as well as on the masses of the main components of the Orion Trapezium. Based on the most reliable values of these quantities we study the dynamical evolution of ensembles of multiple systems mimicking the Orion Trapezium. To this end we conduct numerical N-body integrations using the observed masses, planar positions and velocities, radial velocities, and random line-of-sight (z) positions for all components. We include perturbations in these quantities compatible with the observational errors. We find the dynamical lifetimes of such systems to be quite short, of the order of 10 to 50 thousand years. The end result of the simulations is usually a tight binary, or sometimes a hierarchical triple. The properties of the evolved systems are studied at different values of the crossing times. The frequency distributions of the major semiaxes and eccentricities of the resulting binaries are discussed and compared with observations. Read more (1255kb, PDF) __________________

Blobrana

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Posts: 131433

Date: Nov 24 10:45 2015

Messier 42	Permalink

NGC 1976 (also Messier 42, M42, LBN 974, Sharpless 281) is a magnitude +3 nebula located 1,344 ± 20 light-years away in the constellation Orion. The nebula was discovered by Nicolas-Claude Fabri de Peiresc with a small refracting telescope on the 24th November 1610. Right Ascension 05^h 35^m 17.1^s, Declination -05° 23' 25" See more __________________