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Ultraviolet observations of cataclysmic variables : the IUE archive.
Verbunt, F.
A comparative study of the ultraviolet properties of cataclysmic variables is made on the basis of the IUE data archive. The reddening to 51 systems is determined from the 2200 Å feature. The spectral flux distribution of cataclysmic variables does not depend on system type, orbital period or (for dwarf novae) average length of interval between ou…
The final COS-B database - In-flight calibration of sensitivity and instrumental background behaviour
Strong, A. W.; Hermsen, W.; Lebrun, F. +3 more
This is one in a series of papers prepared in association with the release of the final COS-B database. Various aspects of the performance of the COS-B gamma-ray telescope are studied using in-flight data. First, the time-variation of the sensitivity and background over the 6.7 years of the mission is investigated. COS-B observed many regions of t…
Spectral features of the B2e star EW Lac before and during the variable shell phase.
Floquet, M.; Hubert, A. M.; Chauville, J. +1 more
An examination of the spectral characteristics of the B2e shell star EW Lac before and during the variable shell phase is presented based on 93 spectrograms obtained between 1960 and 1984 with the Haute Provence Observatory coude spectrograph. Characteristics of the prevariable shell phase include radial velocity fluctuations of shell lines of wea…
Identification lists of the far UV spectra of 7 solar chemical composition main sequence stars in the spectral range B2-B9.5.
Pasian, F.; Castelli, F.; Morossi, C. +2 more
The authors present the identification lists for the far UV spectrum of 7 main-sequence stars with solar chemical composition, covering the spectral type range B2 - B9.5, to be used for comparison purposes in the analysis of UV spectra. The lists have been obtained by means of an automatic procedure developed by the authors consisting of the autom…
The ultraviolet spectrum of the peculiar emission-line star GG Carinae : the line identifications.
Gosset, E.; Brandi, E.
Line features as well as the continuum of GG Carinae in the ultraviolet wavelength domain were described by Brandi et al. (1986) on the basis of a series of high and low resolution IUE spectra for which the line identifications are detailed here. The present contribution is thus the complement to the above-mentioned paper and enables the disentang…
The Fe II emission in the UV spectrum of CH Cyg.
Selvelli, P. L.; Marsi, C.
Fe II emission lines are present in all UV spectra of CH Cyg, with a great increase in number and intensity since 1985. The authors give a list of emission intensities and equivalent widths for the prominent Fe II lines. Optical depth effects are clearly evident from a comparison of the relative emission intensities within couples of multiplets wh…
COS-B upper limit to the greater than 70 MeV gamma-ray flux from a gamma-ray burst event of 1979 November 9
Clements, D. L.; Williams, O. R.; Sumner, T. J. +1 more
Using the COS-B data base an upper limit of 2×10-7cm-2s-1keV-1 has been set to the high energy (70 - 1000 MeV) gamma-ray burst flux from a gamma-ray burst event of 1979 November 9. This limit is consistent with a power law extension from the lower energy data with a differential index of ≤-1.39. An upper…