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UV, optical and IR observations of cepheid R Mus.

Heck, A.; Russo, G.; Eichendorf, W. +2 more

Ultraviolet IUE spectra, optical 12 A/mm red and blue spectra, optical BV photometry and infrared JHKL photometry of the 7.5-d classical Cepheid R Muscae equals HD 110 311 are presented and discussed together with some earlier photometric and radial velocity data. Using the CORS method, a newly derived radius is given, as well as new values for ef…

Appendix - Empirical Estimates of Noise Levels in IUE Low-Dispersion Spectra

Ayres, T. R.

A search for medium Z elements in the ultraviolet spectrum of kap Cnc.

Bord, D. J.; Davidson, J. P.

The method of wavelength coincidence statistics is used to search for selected elements having Z values in the 12-40 range in the long wavelength (1960-3230 A) IUE spectrum of the Hg-Mn star Kappa Cancri. Evidence to support the identifications of the even Z elements Mg, Si, Ca, Sr, and Zr, in addition to the odd Z element Cl, has been found. Resu…

Ultraviolet spectroscopy of F and G supergiants with the IUE. II. The hot companions of HR 2786 and HR 2859.

Parsons, S. B.

Hot companion stars in two binary systems are analyzed by means of IUE low-dispersion spectra. HR 2859B is found to be a B2 IV or V star, and analysis of ultraviolet to near-infrared photometry indicates the primary to be an early G star only one magnitude brighter in V with a magnitude of -4.0. A third star probably associated with this system wa…

The visible and ultraviolet continuum from a Herbig-Haro object in the core of M 16 (NGC 6611).

Meaburn, J.

A Herbig-Haro object was found by Meaburn and White (1982) in the neutral clouds within the galactic H II region M 16. Two IUE spectra have now been obtained of this in which a strong continuum is present but no emission lines found. The continuum around 6670 A appears to be of atomic recombination origin but the evidence favors the interpretation…

The IUE observation of the active binary II Pegasi = HD 224085

Udalski, A.; Rucinski, S. M.

II Pegasi is a bright single line spectroscopic binary with an orbital period of 6(d).72. Teh visual light curves of the star exhibit asymmetric light variations with the period very close to the orbital one. The shape of these curves changes on a time scale of years. In connection with the interesting properties of II Peg, it was decided to obtai…

Ultraviolet spectroscopy of phi Per.

Kitchin, C. R.

Ultraviolet observations at high dispersion of Phi Persei obtained on the IUE satellite are described. The interstellar lines are separated from the stellar and shell lines, and all the lines are identified. The velocity of the interstellar medium in the direction of Phi Per is estimated to be about 34 km/sec. A model of the system based on the ul…

Ultraviolet spectra of the X-ray transient A 0538-66.

Raymond, J. C.

Ultraviolet spectra were obtained before and after the optical spectrum changed from absorption to emission lines. The continuum brightness dropped by a factor of 2. Spectra with bright continua show N V, Si IV, and C IV in absorption, while the spectrum with fainter continuum has these lines in emission. The emission lines of N V and Si IV are an…

X-ray diagnostics of globular clusters

Grindlay, J. E.

The presence of compact X-ray sources in globular clusters allows diagnostic studies of both the X-ray sources themselves and the globular clusters to be carried out. A review of much of this work, primarily based on Einstein X-ray observations and supporting studies of globular clusters at radio through UV wavelengths, is presented. The compact X…

Gamma-Ray Astronomy

Wolfendale, A. W.; Houston, B.

A brief description is given of the present status of gamma-ray astronomy, both galactic and extragalactic. More detailed attention is given to a specific question: the nature of the apparent 'gamma-ray sources'. The undoubted correlation of at least some of the sources with dense clouds of gas in the interstellar medium is discussed. A new analys…