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The double Seyfert nucleus of MKN 266.
Kollatschny, W.; Fricke, K. J.
A long-exposure short-wavelength UV spectrum of the double nucleus galaxy Mkn 266 is discussed along with earlier optical data. The spectra of the two nuclei are well separated and both show evidence of a nonthermal origin. The weaker nucleus towards the SW is of Seyfert type 2 while the NE nucleus has characteristics intermediate between Seyferts…
Line profiles from supernovae.
Fransson, C.
The location and mechanism of 120-200-nm emissions from supernovae are investigated theoretically, and the results are applied to IUE observations of SN 1979c reported by Panagia et al. (1980). Analytical expressions are obtained for line profiles originating in the expanding photosphere behind the shock wave (using the two-level approximation) an…
IUE high resolution spectrophotometry of H LY alpha emission from the local interstellar medium
Bowyer, S.; Clarke, J. T.; Fahr, H. J. +1 more
IUE high dispersion spectra of resonantly scattered solar Ly alpha emission from H moving into the solar system with the local interstellar wind are reported which are based on observations conducted in April 1981 and April 1983. A heliocentric velocity of -29 + or - 5 km/s has been observed from the ISW component along with a surface brightness w…
Spectrophotometry of southern Herbig-Haro and related objects.
Krautter, J.; Eichendorf, W.; Reipurth, B.
In this note, spectrophotometry is presented for four Herbig-Haro or Herbig-Haro-like objects. HH 55 is observed for the first time, and has a typical HH spectrum but with weak forbidden N II lines and indication of a weak continuum. M 16 HH 1 shows an extreme weakness of the forbidden OI lines which sets it apart from all known HH objects. Th 28 …
IUE observations of UV bright stars in the globular clusters M15 and omega Cen.
Cacciari, C.; Fusi Pecci, F.; Caloi, V. +1 more
IUE spectra in the low dispersion mode are reported for three UV-bright stars. Two of them (stars K 559 and K 996) are members of the very metal poor cluster M15 and one (star ROA 5701) is a member of the populous cluster ω Cen. The authors find E(B-V) = 0.11 as a lower limit for the reddening of ω Cen whereas the reddening of M15 should not be la…
A study of the expanding envelope around the pole-on Be star HR 5223.
Dachs, J.; Hanuschik, R.
A spectroscopic/photometric survey was performed on the Be star HR 5223 to characterize physical conditions in high- and low-velocity regions and the source regions of observed stellar winds and Balmer line-emitting envelopes of Be stars. Data were gathered from 1978-82 at La Silla and with the IUE spacecraft, and comprised UBV, IR, and UV photome…
Gas in cosmic voids.
Brosch, N.; Gondhalekar, P. M.
Absorption lines at the redshifts of cosmic voids in Perseus-Pisces and Bootes have been detected in the ultraviolet spectra of background quasars. The detection of metal lines suggests chemical enrichment of gas in the voids in support of explosion dominated model of formation of galaxies (Ostriker and Cowie, 1981).
The eclipse of epsilon Aurigae in the ultraviolet.
Ferluga, S.; Hack, M.; Boehm, C.
Ultraviolet low-resolution spectra of Epsilon Aurigae (F0Ia +) have been taken with IUE during the partial and total phase of the present eclipse; they are compared with a set of corresponding pre-eclipse spectra. The following conclusions are derived. A hot component, dominant in far UV, is associated with the extended body that eclipses the prim…
The UV spectrum of the Seyfert 1 galaxy NGC 7469.
Westin, B. A. M.
Results from an investigation of thirty-two IUE spectra of the Seyfert 1 galaxy NGC 7469 are presented. During the observation period, from June 1978 to December 1982, the continuum at 1500 Å (observed wavelength) has been found to vary by a factor of about two. The strong emission lines are broad (FWZI 10,000 - 25,000 km s-1) and asymm…
The presence of Si3+ and C3+ in the wind of AB Aur.
Talavera, A.; Catala, C.
The Herbig Ae variable AB Aur (spectral type A0) exhibits a line spectrum characteristic of a stellar wind. IUE observations of the Si IV and C IV resonance lines in AB Aur are reported. These lines are strong and in absorption. Two models can explain the presence of Si3+ and C3+ in the wind of AB Aur: a "remote chromosphere"…