Search Publications
The IUE spectrum of gamma 1 Velorum.
Sahade, J.; Hernandez, C. A.
Gamma(1) Vel is suggested by IUE observations to be an interacting binary system with nonthermal energy sources and the possibility of two high electron temperature regions, as well as mass outflow from one of the components. A UV continuum is obtained which fits the Kurucz (1979) LTE model atmosphere computations for an effective temperature of 2…
A search for chromospheric emission in TU Cassiopeiae spectra.
Henden, A. A.; Cornett, R. H.; Schmidt, E. G.
The authors have searched high-resolution spectra of the multimode cepheid TU Cas for evidence of chromospheric emission. Spectral regions covered include the Ca II near-IR triplet near 8600 Å, Hα, Ca II H and K, Mg II h and k; phase coverage in both primary and secondary modes was reasonably complete. There was no evidence for changes other than …
Multifrequency observations of the quasi-stellar object Ton 1542.
Bruhweiler, F. C.; Miller, H. R.; Worrall, D. M. +3 more
The authors present single-epoch multifrequency data for the radio-quiet low-redshift QSO Ton 1542, spanning radio through ultraviolet wavelengths. They measure a 3σ upper limit of 9.2 mJy for the 20.3 GHz flux density. The first ultraviolet spectrum of this object is presented and discussed. The authors find a particularly strong excess of flux d…
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.