scholarly journals Locally Optimally Emitting Clouds and the Variable Broad Emission Line Spectrum of NGC 5548

2000 ◽  
Vol 536 (1) ◽  
pp. 284-298 ◽  
Author(s):  
Kirk T. Korista ◽  
Michael R. Goad
Keyword(s):  
Emission Line ◽  
Line Spectrum ◽  
Broad Emission ◽  
Emission Line Spectrum ◽  
Broad Emission Line ◽  
Ngc 5548

scholarly journals Observation of mass loss in R CrB during the visual light minimum

1981 ◽  
Vol 59 ◽  
pp. 469-471
Author(s):  
N. Kameswara Rao
Keyword(s):  
Emission Line ◽  
Line Spectrum ◽  
Expansion Velocity ◽  
Light Minimum ◽  
Broad Emission ◽  
Emission Line Spectrum ◽  
Broad Emission Line ◽  
Light Maximum ◽  
Sharp Emission Line ◽  
Visual Light

R CrB at minimum light shows three type of spectra: 1) an absorption line spectrum similar to that observed at maximum light; 2) a sharp emission line spectrum mainly due to singly ionised metals which is displaced to the blue by 3 to 10 kms-1 with reference to the absorption spectrum observed at maximum. This is supposed to be a kind of permanent feature which exists even at the time of light maximum; 3) a broad emission line spectrum consisting of mainly λ3889 of Hel, H and K lines of Call and the D lines of Nal. The widths of the broad emission features indicate expansion velocity of 200 kms-1, much greater than the escape velocity (Gaposchkin 1963, Rao 1975).

scholarly journals Dynamics of Broad Emission‐Line Region in NGC 5548: Hydromagnetic Wind Model versus Observations

1997 ◽  
Vol 479 (1) ◽  
pp. 200-221 ◽  
Author(s):  
Mark Bottorff ◽  
Kirk T. Korista ◽  
Isaac Shlosman ◽  
Roger D. Blandford
Keyword(s):  
Emission Line ◽  
Wind Model ◽  
Broad Emission ◽  
Line Region ◽  
Broad Emission Line ◽  
Ngc 5548 ◽  
Model Versus

scholarly journals Kinematics of the Broad Emission Line Region in NGC 5548

1996 ◽  
Vol 463 ◽  
pp. 144 ◽  
Author(s):  
Christine Done ◽  
Julian H. Krolik
Keyword(s):  
Emission Line ◽  
Broad Emission ◽  
Line Region ◽  
Broad Emission Line ◽  
Ngc 5548

scholarly journals Preliminary Analysis of the Broad He I Emission Lines in R CrB

1985 ◽  
Vol 87 ◽  
pp. 199-202
Author(s):  
R. Surendiranath ◽  
K.E. Rangarajan ◽  
N. Kameswara Rao
Keyword(s):  
Emission Line ◽  
Preliminary Analysis ◽  
Emission Lines ◽  
Minimum Phase ◽  
Physical Conditions ◽  
Light Minimum ◽  
Broad Emission ◽  
Emission Line Spectrum ◽  
Intensity Ratios ◽  
Broad Emission Line

Abstract:During light minimum phase, R CrB shows a broad emission line spectrum of He I including λ10830, λ7065, λ7281, λ3889, λ6678 and λ3188. But λ5876 is very weak. The observed intensity ratios of I(λ3889)/I(λ5876) and I(λ7065)/I(λ5876) were greater than 1. The anomalous intensities of these lines appear to be due to optical depth efects. Peliminary analysis is presented to derive the physical conditions of the emitting gas.

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