Search Publications
Quantification of the order overlap problem for IUE high resolution spectra (SWP camera). A correction algorithm.
Bianchi, L.; Bohlin, R. C.
A quantification of the order overlap in IUE high resolution spectra is obtained, for the SWP camera, by comparison of line depths measured in IUE and Copernicus spectra. The amount of order overlap is found to be about 32 percent of the net spectrum at 1150 A, decreasing to zero at about 1400 A, for data extracted with the most recent production …
An upper limit to the abundance of 9Be in the population II star HD 76932 from a high resolution spectrum with the IUE.
Molaro, P.; Beckman, J.
A high resolution spectrum (Δλ = 0.2 Å) of the Population II star HD 76932 from the archive of the IUE satellite has been analysed in a search for measurable resonance absorption lines due to 9Be. Matching the observations by a synthesized model of the wavelength region around the doublet at 3130 Å gives a conservative upper limit for t…
Non-LTE analysis of subluminous O-stars. VI. Feige 110.
Heber, U.; Kudritzki, R. P.; Hamann, W. -R. +3 more
An analysis of the ultraviolet (1150-2000 A) and the blue 4000-5100 A) spectra of the subdwarf O-star Feige 110 is presented. Effective temperature, gravity and helium abundance of Feige 110 are determined on the basis of NLTE model atmospheres. The effective temperature of Feige 110 is found to be 40,000 K (+5000 or -3000 K). Helium abundances in…
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).