Search Publications
Analysis of HST Ultraviolet Spectra for T Tauri Stars: RU Lup
Lamzin, S. A.
The ultraviolet spectra of the star RU Lup obtained with the Hubble Space Telescope are analyzed. Emission lines are identified. The presence of absorption components with a nearly zero residual intensity in the MgII resonance doublet lines is indicative of mass outflow with a velocity V_infty = 300 km/s. These lines also exhibit a broad (1400 km/…
Tridimensional Spectrophotometric Study of the Extended Emission-Line Regions of the Infrared-Luminous Merger Markarian 266
Yoshida, Michitoshi; Hattori, Takashi; Ishigaki, Tsuyoshi +6 more
An extensive tridimensional spectrophotometric study of the extended emission-line regions of Mrk 266, a merging system of a Seyfert galaxy and a LINER, was performed. We obtained its narrow-band images of Hα , [O III] lambda 5007, and [S II] lambda lambda 6716, 6731 using an imaging Fabry-Perot interferometer with a tunable filter and area spectr…
Solar transition region line broadening: Limb to limb measurements
Doyle, J. G.; Teriaca, L.; Banerjee, D.
Full disk images from SUMER/SoHO taken in He I, C IV and Ne VIII are used to investigate whether there exists a center-to-limb variation in the line width. Both C IV and He I show such a variation but the higher temperature Ne VIII line is relatively constant. For C IV, this corresponds to ~ 3 km s-1 difference while He I is significant…
Episodic absorption in the outflow of the old nova V603 Aquilae
Ringwald, F. A.; Prinja, Raman K.; Knigge, Christian +1 more
We report on the time-dependent behaviour of ultraviolet spectral lines in Hubble Space Telescope Goddard High-Resolution Spectrograph data of the classical nova V603 Aql. In particular, episodic blueshifted absorption (extending to ~-2500kms-1) is present, with a variability time-scale down to ~1min. The data provide a rare opportunity…
Spectrophotometry of Four Kuiper Belt Objects with NICMOS
Gilmore, Diane; Noll, Keith S.; Luu, Jane
We have obtained spectrophotometric observations of four Kuiper Belt objects using the Hubble Space Telescope's Near Infrared Camera and Multi-Object Spectrometer, NICMOS, in broad and medium bandwidth filters selected to search for the presence of strong solid state spectral features in the 1.6-2.2 µm range. We find distinct differences in …
ISO observations of the BL Lacertae object PKS 2155-304
Maraschi, L.; Tagliaferri, G.; Ghisellini, G. +5 more
The BL Lacertae object PKS 2155-304 was observed by the Infrared Space Observatory in May and June 1996, during a multiwavelength campaign. These are the first observations in the mid- and far-infrared bands since IRAS. In the observing period, the source showed no detectable time variability at 4.0, 14.3, 60 and 90 mu m. The spectrum from 2.8 to …
X-ray analysis of the cluster 3C 129
Leahy, D. A.; Yin, D.
The cluster 3C 129 is classified as a rich cluster. An analysis of the properties of the cluster 3C 129 from ROSAT PSPC and HRI, Einstein IPC, and EXOSAT ME observations is presented. The mean temperature from a joint fit of the ROSAT PSPC and EXOSAT ME data is 5.5(+/-0.2)keV. The luminosity is 0.6x1044ergs-1 in 0.2-2.4keV an…
The Atmosphere of Mira Variables: A View with the Hubble Space Telescope
Luttermoser, Donald G.
Ultraviolet spectra obtained with Hubble Space Telescope (HST) of two Mira-type variable stars, R Leo and R Hya, are presented, along with analysis providing information on their outer atmospheres. These high-dispersion spectra were taken with the Goddard High Resolution Spectrograph (HRS) in two spectral regions: 2320-2368 Å to record the C II] (…
First results of UVES at VLT: revisiting RR Tel
Bonifacio, P.; Selvelli, P. L.
We present here the first results of UVES observations of RR Tel. The exceptional performances of the instrument have allowed the detection of new spectral features and have led to an improvement in the identifications of several emission lines. A direct comparison with the IUE observations in the range 3045-3300 Åhas revealed the appearance of ma…
UV spectra of T Tauri stars from Hubble Space Telescope: RW Aur
Vittone, A. A.; Errico, L.; Lamzin, S. A.
Ultraviolet spectra of the classical T Tauri star RW Aur A observed with the Hubble Space Telescope were analysed. Absorption lines of neutral and singly ionized metals, blueshifted ~ 50 km s-1 relative to the star, were found. They originate in a dense (N>1010 cm-3) gas outflow, whose extension along the line o…