Predicted long-slit, high-resolution emission-line profiles from interstellar bow shocks. II - Arbitrary bow shock orientation

1986 ◽  
Vol 308 ◽  
pp. 829 ◽  
Author(s):  
A. C. Raga ◽  
K. H. Bohm
Keyword(s):  
High Resolution ◽  
Emission Line ◽  
Bow Shock ◽  
Line Profiles ◽  
Bow Shocks

scholarly journals Jet–Cloud Interactions in Compact Steep Spectrum Radio Sources

2003 ◽  
Vol 20 (1) ◽  
pp. 88-93 ◽  
Author(s):  
C. P. O'Dea ◽  
W. H. de Vries ◽  
A. M. Koekemoer ◽  
S. A. Baum ◽  
D. J. Axon ◽  
...  
Keyword(s):  
Emission Line ◽  
Radio Source ◽  
Bow Shock ◽  
Radio Sources ◽  
Line Profiles ◽  
Multiple Components ◽  
Spectrum Radio ◽  
Velocity Variations

AbstractWe have obtained HST/STIS long slit spectroscopy of the aligned emission line nebulae in three compact steep spectrum (CSS) radio sources — 3C 67, 3C 277.1, and 3C 303.1. We find systematic offsets (˜300–500 kms) of the emission line velocities on one or both sides of the radio sources. We also see evidence for broad lines (FWHM ˜500 kms) and complex emission line profiles. In 3C 303.1 the data are consistent with multiple components and possibly split lines. The amplitude of the velocity variations is not so large as to exclude gravitationally-induced motions. However, the complex kinematics, the lack of a signature of Keplerian rotation, and the association of the velocity variations with the radio lobes are consistent with the observed ˜300–500 kms velocities being driven by the expansion of the radio source. Acceleration of the clouds by the bow shock is plausible given the estimated densities in the clouds and the velocities observed in the much smaller compact symmetric objects and with expansion velocities estimated from spectral ageing. This conclusion is unchanged if we consider the scenario in which the cloud acceleration is dominated by the post bow shock flow.

High Resolution Emission Line Profiles in Blue Luminous Stars

1989 ◽  
pp. 279-280 ◽  
Author(s):  
Rino Bandiera ◽  
Paola Focardi ◽  
Aldo Altamore ◽  
Corrine Rossi ◽  
Otmar Stahl
Keyword(s):  
High Resolution ◽  
Emission Line ◽  
Line Profiles

scholarly journals X-RAY EMISSION LINE PROFILES FROM WIND CLUMP BOW SHOCKS IN MASSIVE STARS

2012 ◽  
Vol 750 (1) ◽  
pp. 40 ◽  
Author(s):  
R. Ignace ◽  
W. L. Waldron ◽  
J. P. Cassinelli ◽  
A. E. Burke
Keyword(s):  
Emission Line ◽  
Massive Stars ◽  
Line Profiles ◽  
X Ray ◽  
Bow Shocks

scholarly journals High-resolution emission line profiles in blue luminous stars

1989 ◽  
Vol 113 ◽  
pp. 279-280
Author(s):  
Rino Bandiera ◽  
Paola Focardi ◽  
Aldo Altamore ◽  
Corinne Rossi ◽  
Otmar Stahl
Keyword(s):  
High Resolution ◽  
Emission Line ◽  
High Velocity ◽  
Large Scale ◽  
Velocity Fields ◽  
Emission Lines ◽  
Line Profiles ◽  
High Luminosity ◽  
Stellar Envelopes ◽  
Η Car

Emission lines are often observed in high luminosity stars and provide evidence of the presence of extended stellar envelopes. Ha is the most frequently observed across the H-R diagram, but lines of Hel or Fell are also found in emission in these stars. They could be used as diagnostics of the structure of their outer atmospheres and winds. High resolution (1/dl ~ 105) high S/N profiles of Ha and Hel 5876 in the galactic LBVs η Car, AG and HR Car, and in the LMC star S22 have been obtained with the ESO CAT-CES during 1984-87, and are described in Figs.1-5. We find that these stars show a large variety of profiles with narrow and broad emissions, wide or multiple blue-shifted absorptions. The profiles are largely variable. Once, a kind of inverse P Cyg profile was observed in HR Car (Fig.4). These results indicate the presence of large scale phenomena and high velocity fields which are dramatically variable in time. Continuous HIRES monitoring of these stars is urgently needed.

A high resolution UV spectrograph for sounding rocket measurement of planetary emission line profiles

1992 ◽  
Author(s):  
Walter M. Harris ◽  
John T. Clarke ◽  
Jack Caldwell ◽  
Paul D. Feldman ◽  
Brett C. Bush ◽  
...  
Keyword(s):  
High Resolution ◽  
Emission Line ◽  
Sounding Rocket ◽  
Line Profiles ◽  
Rocket Measurement

scholarly journals High-Resolution Emission-Line Spectroscopy of Be Stars: Comparison of Hα and Weak Emission Lines

1987 ◽  
Vol 92 ◽  
pp. 208-210
Author(s):  
Reinhard W. Hanuschik
Keyword(s):  
High Resolution ◽  
Emission Line ◽  
Rotational Velocity ◽  
Outer Radius ◽  
Emission Lines ◽  
Be Stars ◽  
Line Profiles ◽  
Component Structure ◽  
Double Peak Structure ◽  
Disk Component

AbstractFor a number of bright southern Be stars, high-resolution, high S/N spectroscopy has been performed for Hα, Si II λ6371 and four Fe II emission lines. With the exception of four stars, both Hα and weak emission line profiles exhibit resolved double-peak structure. Peak separation increases with stellar projected rotational velocity. In many cases, Hα profiles (but not Fe II lines) show resolved fine-structure (inflections in the flanks) indicating a two-component structure of the disk. Envelope models with arbitrary density and rotational velocity laws have been fitted to the Fe II line profiles with satisfactory results. It is found that the innermost Hα disk component also emits the Fe II lines and has an average outer radius of 5 r*; density falls off as r-l.5 or more rapidly. The outer disk component emits the faint and narrow secondary component of Hα lines with average outer radius 20 r*. The envelopes of the four stars with a strong, dominating single peak both in Hα and Fe II either are dominated by strong radial motions or, more likely, have elliptical disk-like structure.

scholarly journals Substructures in the Narrow-Line Region of AGN

1989 ◽  
Vol 134 ◽  
pp. 312-313
Author(s):  
Sylvain Veilleux
Keyword(s):  
High Resolution ◽  
Emission Line ◽  
Seyfert Galaxies ◽  
Narrow Line ◽  
Line Profiles ◽  
Preliminary Results ◽  
Line Region ◽  
Narrow Line Region ◽  
Narrow Emission ◽  
Resolution Study

The preliminary results of a high-resolution study of narrow emission-line profiles in bright Seyfert galaxies are reported. Profile substructures such as secondary peaks and shoulders are observed in nearly all the objects. The results of profile comparisons in Mrk 359, Mrk 533, and Mrk 1066 are briefly discussed.

scholarly journals Theoretical Narrow Emission-Line Profiles of Active Galactic Nuclei

1989 ◽  
Vol 134 ◽  
pp. 318-319
Author(s):  
M. Contini ◽  
S.M. Viegas-Aldrovandi
Keyword(s):  
High Resolution ◽  
Emission Line ◽  
Active Galactic Nuclei ◽  
Line Profile ◽  
Galactic Nuclei ◽  
Line Profiles ◽  
Narrow Emission

In recent years, a large number of high resolution observations of active galactic nuclei (AGN) have become available. Most of them show the [OIII]5007 line profile (Heckman, Miley and Green 1984, Vrtilek and Carleton 1985, Whittle 1985a,b).

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