Time‐variable Intrinsic Absorption Lines in the Quasi‐stellar Object Q2343+125

1997 ◽  
Vol 478 (1) ◽  
pp. 87-93 ◽  
Author(s):  
Fred Hamann ◽  
Thomas A. Barlow ◽  
Vesa Junkkarinen
Keyword(s):  
Time Variable ◽  
Stellar Object ◽  
Absorption Lines ◽  
Intrinsic Absorption

High‐Resolution Spectra of Intrinsic Absorption Lines in the Quasi‐stellar Object UM 675

1997 ◽  
Vol 478 (1) ◽  
pp. 80-86 ◽  
Author(s):  
Fred Hamann ◽  
Thomas A. Barlow ◽  
Vesa Junkkarinen ◽  
E. M. Burbidge
Keyword(s):  
High Resolution ◽  
Stellar Object ◽  
Absorption Lines ◽  
Intrinsic Absorption

Absorption Lines in the Spectra of the QSO PKS 1448-232

1984 ◽  
Vol 5 (3) ◽  
pp. 355-359 ◽  
Author(s):  
Chen Jian-sheng ◽  
Donald C. Morton ◽  
Bruce A. Peterson ◽  
Alan E. Wright ◽  
David L. Jauncey
Keyword(s):  
Radio Source ◽  
Stellar Object ◽  
Absorption Lines ◽  
Ultraviolet Excess ◽  
Low Resolution ◽  
Optical Position

Savage et al. (1977) found that the radio source PKS 1448-232 coincided with a stellar object of about magnitude 16.4 having an ultraviolet excess. A low resolution spectrum obtained with the Anglo-Australian Telescope (AAT) confirmed this object as a QSO with zem = 2.22 and revealed many absorption lines short-ward of the La emission. Consequently this object was included in a programme of spectroscopy at intermediate resolution with the AAT to investigate QSO absorption lines. Savage et al. have given a finding chart with an optical position of 14h48m09s.3, −23°17′10″ (1950.0). The radio fluxes are 0.40 Jy at 2.7 GHz and 0.31 Jy at 5.0 GHz.

The origin of the quasi-stellar object absorption lines

1991 ◽  
Vol 377 ◽  
pp. 39 ◽  
Author(s):  
S. M. Viegas ◽  
R. B. Gruenwald
Keyword(s):  
Stellar Object ◽  
Absorption Lines

Chromospheric activity in red giants, and related phenomena

1970 ◽  
Vol 36 ◽  
pp. 199-208
Author(s):  
Armin J. Deutsch
Keyword(s):  
Emission Line ◽  
Spectral Type ◽  
Time Scale ◽  
Vacuum Ultraviolet ◽  
Time Variable ◽  
Emission Lines ◽  
Absorption Lines ◽  
Red Giants ◽  
Chromospheric Activity ◽  
Near Ultraviolet

Normal red giants of a given spectral type are shown to be heterogeneous with respect to the following chromospheric features: the Balmer absorption lines, the emission line at H∊, and the double-reversed emission lines at Caii H and K. These chromospheric lines are also shown to be strongly time variable, in at least some red giants, on a time scale of a few months or years. Other chromospheric features that require study lie in the infrared (Hei 10830), the near ultraviolet (Feii emission lines), and the vacuum ultraviolet.

scholarly journals MONITORING THE VARIABILITY OF INTRINSIC ABSORPTION LINES IN QUASAR SPECTRA, ,

2014 ◽  
Vol 792 (1) ◽  
pp. 77 ◽  
Author(s):  
Toru Misawa ◽  
Jane C. Charlton ◽  
Michael Eracleous
Keyword(s):  
Absorption Lines ◽  
Intrinsic Absorption ◽  
Quasar Spectra

scholarly journals Variability Tests for Intrinsic Absorption Lines in Quasar Spectra

2004 ◽  
Vol 601 (2) ◽  
pp. 715-722 ◽  
Author(s):  
Desika Narayanan ◽  
Fred Hamann ◽  
Tom Barlow ◽  
E. M. Burbidge ◽  
Ross D. Cohen ◽  
...  
Keyword(s):  
Absorption Lines ◽  
Intrinsic Absorption ◽  
Quasar Spectra

scholarly journals Intrinsic Absorption Lines in Seyfert 1 Galaxies. I. Ultraviolet Spectra from theHubble Space Telescope

1999 ◽  
Vol 516 (2) ◽  
pp. 750-768 ◽  
Author(s):  
D. Michael Crenshaw ◽  
Steven B. Kraemer ◽  
Albert Boggess ◽  
Stephen P. Maran ◽  
Richard F. Mushotzky ◽  
...  
Keyword(s):  
Absorption Lines ◽  
Space Telescope ◽  
Ultraviolet Spectra ◽  
Intrinsic Absorption
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