scholarly journals Spitzer reveals what's behind Orion's Bar

2009 ◽  
Vol 5 (H15) ◽  
pp. 402-402
Author(s):  
Robert H. Rubin
Keyword(s):  
Spectral Range ◽  
Orion Nebula ◽  
Space Telescope ◽  
Exciting Star ◽  
Extreme Sensitivity

AbstractWe present Spitzer Space Telescope observations of 11 regions in the Orion Nebula all southeast of the Bright Bar. Our Cycle 5 program obtained deep spectra with both the IRS short-high (SH) and long-high (LH) modules with aperture grid patterns chosen to very closely match the same area in the nebula. Previous IR missions observed only the inner few arcmin (the ‘Huygens’ region). The extreme sensitivity of Spitzer in the 10-37 μm spectral range permitted us to measure many lines of interest to much larger distances from the exciting star θ1 Ori C.

scholarly journals THE HUBBLE SPACE TELESCOPE TREASURY PROGRAM ON THE ORION NEBULA CLUSTER ,

2013 ◽  
Vol 207 (1) ◽  
pp. 10 ◽  
Author(s):  
M. Robberto ◽  
D. R. Soderblom ◽  
E. Bergeron ◽  
V. Kozhurina-Platais ◽  
R. B. Makidon ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Orion Nebula ◽  
Space Telescope

On the Bowshocks Associated with the Orion Proplyds

2001 ◽  
Vol 205 ◽  
pp. 274-275
Author(s):  
S.J. Arthur ◽  
W.J. Henney ◽  
F. García-Arredondo
Keyword(s):  
High Resolution ◽  
Stellar Wind ◽  
Careful Analysis ◽  
Orion Nebula ◽  
Pressure Balance ◽  
High Resolution Data ◽  
Ram Pressure ◽  
Exciting Star ◽  
Resolution Data

We investigate the global stellar wind dynamics of the exciting star of the Orion Nebula by using the “proplyds” and their bowshocks as probes of the ram pressure balance conditions in the nebula. This careful analysis is only possible if high resolution data are available, since the proplyds are so small and the bowshocks are so faint.

scholarly journals Two-Wind Interaction Models of the Proplyds in the Orion Nebula

1997 ◽  
Vol 182 ◽  
pp. 561-570
Author(s):  
W. J. Henney ◽  
S. J. Arthur
Keyword(s):  
Emission Line ◽  
Stellar Wind ◽  
Massive Star ◽  
Mass Star ◽  
Line Profiles ◽  
Orion Nebula ◽  
Low Mass Stars ◽  
Exciting Star ◽  
Low Mass ◽  
Hydrodynamical Simulations

Many low-mass stars in the Orion nebula are associated with very compact (≃ 1 arcsec) emission knots, known variously as proplyds, PIGs or LV knots. Some of these knots are teardrop-shaped, with “tails” pointing away from the massive star θ1 Ori C, which is the principal exciting star of the nebula. We discuss models of such knots, which invoke the interaction of the fast stellar wind from θ1 Ori C with a transonic photoevaporated flow from the surface of an accretion disk around a young low-mass star. We review previous analytic work and compare the results of the model with the observed brightnesses, morphologies and emission line profiles of the knots, as well as presenting new results from numerical hydrodynamical simulations.

scholarly journals HST Spectroscopy of the Orion Nebula

1996 ◽  
Vol 169 ◽  
pp. 629-632
Author(s):  
R.H. Rubin ◽  
G.J. Ferland ◽  
R.J. Dufour ◽  
D.K. Walter ◽  
C.R. O'dell ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Orion Nebula ◽  
Signal To Noise ◽  
Space Telescope ◽  
Preliminary Results ◽  
Faint Object ◽  
Nitrogen Abundance ◽  
H Ii Region ◽  
Faint Object Spectrograph ◽  
Independent Derivation

From our recent Faint Object Spectrograph (FOS) observations of the Orion Nebula obtained with the Hubble Space Telescope, we present preliminary results that address the nitrogen abundance. The list of detected lines and their identifications included the first measurement of the N II] 2142 Å line in an H II region. This measurement in conjunction with [O II] 2471 Å permits a new assessment of the important N/O ratio in Orion. Unfortunately, the measurements of the N III] 1747-54 Å multiplet and the O III] 1660-66 Å multiplet have poor signal-to-noise, precluding another independent derivation of N/O.

Imagery and Astronomy: Visual Antecedents Informing Non-Reproductive Depictions of the Orion Nebula

Leonardo ◽  
2014 ◽  
Vol 47 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Shana Cooperstein
Keyword(s):  
19Th Century ◽  
Hubble Space Telescope ◽  
Public Outreach ◽  
Orion Nebula ◽  
Space Telescope

The author analyzes the visual similarities between early astronomy images and advanced practices such as produced by the Hubble Space Telescope (HST). While 19th-century images generally were supposed to match what an observer could see if s/he were standing behind the telescope, HST public outreach images are not based on any such match, yet such images resemble photographs that do aim to represent what we see. This paper attempts to explain the insistence on producing images that appear to represent visible phenomena. Emphasizing the ways in which non-reproductive photographs deploy conventions that were originally utilized in reproductive photography, the paper seeks to add to the existing literature concerning the non-reproductive capacities of photography.

scholarly journals Temperature variations from Hubble Space Telescope spectroscopy of the Orion Nebula

2003 ◽  
Vol 340 (2) ◽  
pp. 362-374 ◽  
Author(s):  
R. H. Rubin ◽  
P. G. Martin ◽  
R. J. Dufour ◽  
G. J. Ferland ◽  
K. P. M. Blagrave ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Orion Nebula ◽  
Temperature Variations ◽  
Space Telescope

scholarly journals Hubble Space Telescope Astrometry in the Orion Nebula Cluster: Census of Low-mass Runaways

2020 ◽  
Vol 159 (6) ◽  
pp. 272
Author(s):  
Imants Platais ◽  
Massimo Robberto ◽  
Andrea Bellini ◽  
Vera Kozhurina-Platais ◽  
Mario Gennaro ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Orion Nebula ◽  
Space Telescope ◽  
Low Mass

General characteristics of interstellar clouds and their interpretation

1967 ◽  
Vol 31 ◽  
pp. 95-115
Author(s):  
F. D. Kahn
Keyword(s):  
Equations Of Motion ◽  
Orion Nebula ◽  
Interstellar Gas ◽  
Ionized Gas ◽  
Interstellar Clouds ◽  
Ionization Fronts ◽  
Heating And Cooling ◽  
Exciting Star ◽  
Early Type Stars ◽  
Time Required

This report is concerned with recent progress on various aspects of interstellar gas dynamics, including an investigation of the Orion Nebula, studies of H 11 regions and of ionization fronts, a statistical model of H 1 clouds and a re-appraisal of the heating and cooling processes in H 1 regions.Dyson has worked out a new model for the Orion Nebula, in which it is supposed that dense pockets of non-ionized gas exist within the H 11 region. He makes predictions concerning the flow of ionized gas around these pockets, and about the possible presence of shock-waves nearby.Mendis has extended Axford's classical description of ionization fronts to include the case in which a front advances into a region where the hydrogen is molecular, and finds that there are a number of consequent changes in the nature of the front. Hjellming has given a comprehensive account of the processes by which a thermal balance is achieved in an H 11 region, and has shown how the temperature in its various parts depends on the distance from the exciting star and on the stellar surface temperature. Mathews has integrated the equations of motion for a growing H 11 region, and has described how ionization fronts develop and when shocks will occur. Lasker has followed the motion further, and has given examples to show how older H 11 regions evolve.By means of a simple model of H 1 clouds, Field and Saslaw have tried to estimate how long it would take to form a massive interstellar complex which would become gravitationally unstable. They find that the time required is relatively short. One must therefore assume that only a small fraction of an unstable cloud can condense into stars, or else the rate of star formation would be too rapid.Finally an estimate is made of the rate at which early-type stars supply kinetic energy to the H 1 clouds, via the expansion of H 11 regions. One cannot, with the present data, decide definitely whether this process is important. A possible alternative would be the acceleration of gas clouds by supernova shells.

Sign in / Sign up

Export Citation Format

Share Document