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The effective temperature, radius, rate of mass loss and luminosity of P Cygni, HD 190603, kappa Cassiopeiae, and rho Leonis.
Underhill, A. B.
The method developed by Underhill et al. (1979) is applied to P Cyg (B1 Iap), HD 190603 (B1 Ia+), kappa Cas (B1 Ia), and rho Leo (B1 Ib or Iab) using the S2/68 absolute UV photometry for faint stars (Thompson et al., 1978) and the 13-color photometry. Some profiles of the UV resonance lines are presented, and the implication of pertinent data for …
IUE observations of gas stream effects in the ultraviolet spectrum of U Cephei.
Kondo, Y.; McCluskey, G. E.; Stencel, R. E.
The eclipsing binary U Cephei has been observed with the International Ultraviolet Explorer (IUE) satellite. Nine high-resolution spectra in the mid-ultraviolet (1900-3200 A) and one high-resolution spectrum in the far-ultraviolet (1200-1900 A) were obtained. The effects of gas streaming are clearly seen in the mid-ultraviolet resonance lines of F…
IUE observations of 32 Cygni: the effects of the B star within the upper chromosphere of a late-type supergiant.
Kondo, Y.; McCluskey, G. E.; Stencel, R. E. +1 more
The object 32 Cygni is a Aurigae-type system, comprised of a KS supergiant and a dwarf, which undergoes atmospheric eclipses. We have obtained high-resolution ultraviolet spectra of this system with IUEnear orbital phase 0.2, covering the 1175-3000 A region. The UV spectrum is striking, since all resonance and other strong lines exhibit marked P C…
On the energy distribution in Sirius B.
Boehm-Vitense, E.; Dettmann, T.; Kapranidis, S.
A spectrum of Sirius B in the wavelength region 1100-1900 A taken with the IUE satellite shows an absolute flux and spectral energy distribution in the continuum in agreement with theoretical white-dwarf models with T(eff) of 26,000 K plus or minus 1000 K for log g equals 8.65 and R equals 5.08 x 10 to the 8th cm. The Lyman-alpha profile is also i…
Ultraviolet spectroscopy of the extreme B supergiants P Cygni and zeta 1 Scorpii.
Hutchings, J. B.
High-dispersion IUE spectra of P Cyg and Zeta-1 Sco are presented. Both show extreme line blanketing by Fe III and similar ions, formed in a low-velocity stellar wind. P Cygni also shows the same phenomenon in Fe II, at somewhat higher velocity, and appears to be cooler and less reddened then its visible spectrum suggests. Both stars show weak evi…
HD 149499B : the hottest white dwarf ?
Wray, J. D.; Parsons, S. B.; Henize, K. G.
IUE spectra of the white dwarf component of HD 149499, discovered from the Skylab experiments S-019 UV survey, show prominent lines of He II. The star appears to be helium-rich with He/H not less than 1. The ultraviolet fluxes show the temperature to be within the range 70,000-100,000 K, with the most probable value near 85,000 K.
The "semitorrid" gas observed in the direction of gamma 2 Velorum and the Gum nebula.
Bruhweiler, F. C.; Kondo, J.; McCluskey, G. E., Jr.
On the basis of recent IUE observations in the far-ultraviolet, the authors report the detection of a 'semitorrid' region of the interstellar medium in the direction of Gamma-2 Velorum and the Gum nebula. The characteristic temperature of this gas is in the 40,000 K range, between the warm (around 1000 K) and hot (roughly 100,000-1,000,000 K) regi…
Electron densities in stellar atmospheres determined from IUE spectra.
Linsky, J. L.; Doschek, G. A.; Mariska, J. T. +1 more
The Lalpha /Hbeta /Palpha ratio in the quasar PG 0026+129.
Perryman, M. A. C.; Baldwin, J. A.; Longair, M. S. +1 more
Observations of the quasar PG 0026+129 with the International Ultraviolet Explorer have determined its L-alpha intensity. In conjunction with visual and infrared observations by Puetter et al. (1978), a L-alpha/H-beta/P-alpha ratio of 6:1:1.4 is derived. The ratios differ from those found in 3C 273. The implications of these observations are discu…