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Spectral energy distributions of hot stars with circumstellar dust.
Sitko, M. L.
Combined spectral energy distribution curves of six Ae/Be stars (BD+61 deg 154, AB Aur, V380 Ori, HD 259431, ZCMa, and BD+40 deg 4124), five peculiar shell stars (HD 31648, HD 45677, HD 50138, HD 163296, and HD 190073), and the peculiar central object in the Red Rectangle nebula (HD 44179), obtained with the IUE and a variety of ground-based optic…
R 81 : P CYG of the LMC.
Stahl, O.; Sterken, C.; Wolf, B. +1 more
Photometric UBV observations and spectroscopic high dispersion coude observations of the very luminous B2.5 eq supergiant R 81 of the LMC carried out between 1970 and 1980 at ESO, La Silla, are discussed. It is noted that the most prominent features of the visual spectrum are P Cygni profiles of the Balmer lines, which are thought to indicate a sh…
IUE detection of bursts of H LYα emission from Saturn
Moos, H. W.; Atreya, S. K.; Clarke, J. T. +1 more
An extended source of H Lyα emission (1,216 Å) from the vicinity of Saturn has been detected previously by a rocket-borne spectrometer1, the OAO-Copernicus satellite2, and the Pioneer 11 spacecraft3. During the rocket experiment, in which Saturn was observed on 15 March 1975, 700 R+/-50% of Lyα emission was detecte…
The chromosphere and corona of Procyon (Alf CMi,F5IV-V).
Jordan, C.; Brown, A.
Observations are reported of Procyon (alpha CMi), an F5 IV-V star, obtained with the IUE satellite at low and high spectral resolutions as part of a program to study the chromospheres and coronae in late-type stars. Methods for analyzing the fluxes and linewidths of alpha CMi and other near main sequence stars are presented, and applied to alpha C…
Distribution of hot stars and hydrogen in the Large Magellanic Cloud
Page, T.; Carruthers, G. R.
Far-UV brightness distribution data for the face of the Large Magellanic Cloud (LMC) are derived from calibrated electrographic imagery in the 1050-1600 and 1250-1600 A ranges, and far-UV fluxes for individual hot-star groupings in the LMC are compared with H-alpha measurements and with a 21-cm survey. It is found that large clouds of interstellar…
High-velocity gas associated with the supernova remnant S 147.
Gondhalekar, P. M.; Blades, J. C.; Phillips, A. P.
The star HD 36665 (Ble), which lies behind the old supernova remnant S147, has been observed with the IUE satellite. High-velocity interstellar absorption components of Fe II, Mg I, Mg II, Al II, C II and Si II were detected which originate in gas associated with the remnant. No such high-velocity lines were observed in the IUE spectrum of HD 4011…
Ultraviolet observations of the Io torus from the IUE observatory
Moos, H. W.; Clarke, J. T.
The short wavelength spectrograph on the International Ultraviolet Explorer (IUE) has been used to obtain 11 A resolution spectra of the Io torus from 1175-1950 A. The four spectra, obtained in the springs of 1979 and 1980, show emissions (about 40R) of S II A1256A and S III A1199A. An unidentified feature is also present at 1729 A; a tentative id…
Far-ultraviolet fluorenscence of carbon monoxide in the red giant Arcturus.
Moos, H. W.; Linsky, J. L.; Ayres, T. R.
Evidence is presented that many of the weak features observed with International Ultraviolet Explorer (IUE) in the far-ultraviolet (1150-2000 A) spectrum of the archetype red giant Arcturus (K2 III) are A-X fourth positive bands of carbon monoxide excited by chromospheric emissions of O I, C I, and H I. The appearance of fluorescent CO bands near …
Observations of strong ultraviolet absorptions in the spectrum of theDC white dwarf LDS 678 B.
Wegner, G.
Evidence from spectroscopic observations that LDS 678 B has strong ultraviolet lines of neutral carbon in its spectrum is presented. The spectra are found to contain strong lines of C I in the ultraviolet and weak He I lines in the visible. The appearance of the star's spectrum and published photometry are consistent with its having an effective t…
The 1979-1980 eclipse of ZET Aur. I. The circumstellar envelope.
Chapman, R. D.
A model of the K-star wind far from the K star, and its interaction with the B star, has been derived from a study of Mg(+) and C(+++) resonance lines in the spectrum of Zeta Aurigae during 1979 and 1980. A mass loss rate from the K star of 2 x 10 to the -8th solar masses/year is suggested by the data; the rate of accretion of the K supergiant's m…