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IUE spectra of the massive close binary V382 Cygni.
Koch, R. H.; Siah, M. J.; Fanelli, M. N.
The massive close binary, V382 Cyg, was observed with the low-dispersion spectrograph on the IUE satellite. The dereddened spectrum can be reasonably represented by a 40,000-K model atmosphere. The spectra show interstellar, photospheric, and shell absorption blends and one shell emission feature. From one of the shell absorptions, it is possible …
IUE observations of an active region of HD206860
Blanco, C.; Catalano, S.; Marilli, E.
THE chromospheric Mg II h and k lines seem to have doubly reversed emission core in the spectra of the Sun and of solar and late type stars. In the solar spectrum the general appearance of Mg II h and k is very similar to the H and K of Ca II, but with larger intensity fluctuations. Current ideas suggest that the h and k lines are strongly sensiti…
Ultraviolet P Cygni profiles of the C IV resonance line for O-type stars in the open cluster IC 1805.
Burki, G.; de Andres, F. L.
The ultraviolet C IV resonance lines of seven O-type stars in IC 1805 were observed with the IUE satellite in the low dispersion mode in the 1150-1950 A and 1900-3200 A wavelength ranges. The spectra showed very large and deep P Cygni profiles of the C IV resonance doublet at 1548.20 A and 1550.77 A, and P Cygni characteristics increased with bolo…
The ultraviolet spectrum of the hot halo star Feige 86.
Hack, M.
The ultraviolet spectrum of the hot halo star Feige 86 has been observed with IUE in the low-resolution mode. The energy distribution gives an effective temperature of 18000 K, in agreement with the value previously derived by Baschek and Sargent (1976) from the visual spectrum. Comparison of the line spectrum with those of two standard stars havi…
Mg II and Ca II emissions from three G dwarfs.
Rego, M.; Fernandez-Figueroa, M. J.
The stars Eta Cet, Beta CnV, and Beta Com have been observed from the ground and the IUE satellite. The Ca II and Mg II K emission line intensities have been compared and show a correlation. The full widths at the base (FWB) corresponding to the Mg II K emission are in the dispersion band of the luminosity-FWB relationship.
A geometrical analysis of the gamma-ray light curves of pulsars.
Massaro, E.; Buccheri, R.; Salvati, M.
In the light curves of the COS-B gamma-ray pulsars, some common features are clearly recognizable; two main peaks always occur, and the intervening phase lag has not the natural value of 0.5. An interpretation is proposed which only involves a simplified geometrical description of the emission pattern, viz. two opposite hollow cones with a first-o…
The UV spectrum of the possible radio star HD 26676.
Stickland, D. J.
Results are reported for low-resolution UV spectroscopy (1150-1950 A and 1850-3250 A) of the star HD 26676, which may be associated with a weak nonthermal radio source, from the IUE satellite. It is found that the energy distribution of this star appears to be that of a perfectly normal single B8 V star. It is concluded that HD 26676 is an unlikel…
Heating of Chromospheres and Coronae in Cool Stars
Mullan, D. J.
Recent evidence is summarized that suggests that neither of two traditional views of chromospheric heating (that the flux of energy required to heat the solar chromosphere) is only a small fraction of the total radiative energy emerging from the solar interior and that chromospheres are heated by acoustic waves generated in the convection zone (wh…
I.U.E. observation of the CO molecule towards PSI Per (B5 Ve) and its implication.
Krishna Swamy, K. S.; Tarafdar, S. P.
International Ultraviolet Explorer probes the universe.
Hartline, B. K.
The impact of the International Ultraviolet Explorer (IUE), launched in January 1978, on ultraviolet astronomy is reviewed. An assortment of firsts has been achieved, including the first UV observation of a supernova, the first high-resolution UV spectrum of a star in another galaxy, and the first evidence that acetylene is present in the upper at…