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Ultraviolet observations of the transient X-ray sources A0535+26 and A0620-00.
Holm, A. V.; Swank, J. H.; Wu, C. -C. +2 more
Observations of A0535+26 (HDE 245770) by the ANS in September 1975 and March 1976 when it was at the X-ray low state are discussed. Also observed were 58 early-type stars lying within 10 deg of HDE 245770; these stars are used to derive a localized extinction curve. On the basis of the depth of the 2200 A interstellar absorption feature observed i…
Epsilon Aurigae in eclipse. I. Ultraviolet spectroscopy during INGRESS and totality.
Lambert, D. L.; Parthasarathy, M.
Epsilon Aurigae is a long-period eclipsing system containing a F0 Ia supergiant and an unseen slightly less-massive secondary. A primary eclipse began in mid-1982 with the unseen companion passing in front of the supergiant. Low-resolution ultraviolet (IUE) spectra of Epsilon Aur in 1982 and early 1983 provide eclipse light curves extending into t…
Ultraviolet activity in EG Andromedae.
Kaler, J. B.; Hickey, J. P.
The authors show that the symbiotic star EG And is an active variable in the ground-based ultraviolet. In five nights of observation spaced over one year, the full range at Strömgren u was 0m.97, as compared to only 0m.13 at y. The energy distribution in the visual is typical of a cool giant, but a significant component of th…
A multiwavelength study of the short-period cataclysmic variable V442 Ophiuchi.
Szkody, P.; Shafter, A. W.
The results of a program of observations of the cataclysmic variable V442 Oph from UV to IR wavelengths are reported. The observations comprise IUE SWP and LWR-camera spectra from October, 1981; UBVr and R photometry at Manastash Ridge Observatory from August, 1980; UBV photometry and IR measurements at Kitt Peak from July, 1981; and Coudespectros…
IUE studies of the Wolf-Rayet binaries HD 186943 and HD 211853 duringeclipse.
Hutchings, J. B.; Massey, P.
IUE spectra have been obtained of the WR binaries HD 186943 and HD 211853 at different orbital phases. Eclipse effects are small in the UV spectra of these stars. For both systems there is an "eclipse" of the continuum flux < 1500 Å at the time of primary conjunction (WR star in front), and, for HD 186943, a comparable decrease of the strongest…
Identification of the soft X-ray source H1011-47 (= E1013-477): a newmagnetic variable?
Reichert, G. A.; Bowyer, S.; Córdova, F. A. +4 more
A variable blue emission-line star is determined to be the probable counterpart of the HEAO-1 soft X-ray source H1011-47 on the basis of an improved position derived with the Einstein satellite. The star is found to vary between magnitudes of 16.7 and 17.7 on a time scale of approximately 100 minutes and by as much as 0.6 magnitude on a time scale…
Two new possible planetary nebulae.
Gull, T. R.; Heckathorn, J. N.; Fesen, R. A.
The authors have identified two new possible planetary nebulae using the Parker, Gull, and Kirshner (1979) emission-line survey of the galactic plane. Both objects exhibit very strong [O III] λ5007 line emission, a symmetrical morphology, and a faint blue central star.
IUE observations of the low-excitation planetary nebula Tc-1.
Feibelman, W. A.
Ultraviolet observations of Tc-1 confirm that the object is a low excitation planetary nebula with a central star of type O7. The nebular spectrum has few emission lines and the P Cygni character of the C IV line remains uncertain. A radial velocity of -95 km/s is found from the semiforbidden C III wavelength 1909 line, and an extinction of 0.22 m…
On the presence of OI lambda 1302 emission in Be stars.
Oegerle, W. R.; Peters, G. J.; Polidan, R. S.
The absence of UV O I emission from Be stars is investigated in terms of a model for a circumstellar disk. Observations of the O I 8446 A transition are shown to produce the UV O I triplet 1302.17, 1304.86, and 1306.02 A, which has not been seen. It is demonstrated that the total scattering optical depth in the circumstellar gas is sufficient to e…