* Astronomy

Members Login
Post Info
TOPIC: Orion Nebula


L

Posts: 130177
Date:
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)



__________________


L

Posts: 130177
Date:
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



__________________


L

Posts: 130177
Date:
RE: Orion Nebula
Permalink  
 


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

Picture 847



__________________


L

Posts: 130177
Date:
Permalink  
 

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

 Picture 873



__________________


L

Posts: 130177
Date:
Permalink  
 

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

Picture 867



__________________


L

Posts: 130177
Date:
Orion nebula 12.01.17
Permalink  
 


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

Picture 827Picture 800

Prime focus.

Clear. Moderate seeing. Full moon

Processed in Paint Shop Pro.

 

 

 

 



__________________


L

Posts: 130177
Date:
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)



__________________


L

Posts: 130177
Date:
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 05h 35m 17.1s, Declination -05° 23' 25"

See more



__________________


L

Posts: 130177
Date:
RE: Orion Nebula
Permalink  
 


The Orion nebula captured with a 8" f5 reflector and Canon EOS 350D. 

Picture 802 


__________________


L

Posts: 130177
Date:
Orion's Sword
Permalink  
 


Three panel photomosaic of Orion's Sword captured with an 8" f5 reflector and Canon EOS 350D. 

Picture 644_mosaic3 


__________________
1 2 38  >  Last»  | Page of 8  sorted by
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard