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The nature of Neptune's increasing brightness: evidence for a seasonal response *
Baines, K. H.; Sromovsky, L. A.; Fry, P. M. +1 more
Hubble Space Telescope (HST) observations in August 2002 show that Neptune's disk-averaged reflectivity increased significantly since 1996, by 3.2 ± 0.3% at 467 nm, 5.6 ± 0.6% at 673 nm, and 40 ± 4% in the 850-1000 nm band, which mainly results from dramatic brightness increases in restricted latitude bands. When 467-nm HST observations from 1994 …
Stellar content of NGC 404 - The nearest S0 Galaxy
Tikhonov, N. A.; Galazutdinova, O. A.; Aparicio, A.
We report V -band and I -band CCD stellar and surface photometry of the galaxy NGC 404 , taken with HST WFPC2 and the 2.5 m Nordic telescope. The colour-magnitude diagram for the stars in this galaxy is typical of that of spheroidal systems (i.e. it lacks luminous, young stars but contains a large number of Asymptotic Giant Branch (AGB) and Red Gi…
The dynamics of the nebula M1-67 around the run-away Wolf-Rayet star WR 124
Lamers, H. J. G. L. M.; van der Sluys, M. V.
A new point of view on the dynamics of the circumstellar nebula M1-67 around the run-away Wolf-Rayet (WR) star WR 124 is presented. We simulated the outbursts of nebulae with different morphologies, to compare the results to the observed dynamical spectra of M1-67. We found that it has been interacting with the surrounding ISM and has formed a bow…
The Hubble Space Telescope WFPC2 B-Band Parallel Survey: A Study of Galaxy Morphology for Magnitudes 18<=B<=27
Driver, Simon P.; Windhorst, Rogier A.; Cohen, Seth H. +2 more
We present the results of the Hubble Space Telescope B-Band Parallel Survey (BBPS). It covers 0.0370 deg2 and consists of 31 shallow (four- to six-orbit), randomly selected high-latitude HST WFPC2 parallel fields with images taken in both the B (F450W) and I (F814W) filters. The goal of this survey is to morphologically classify the gal…
FUSE Measurements of Rydberg Bands of Interstellar CO between 925 and 1150 Å
Andersson, B. -G.; Federman, S. R.; Sheffer, Y.
We report the detection of 11 Rydberg bands of CO in FUSE spectra of the sight line toward HD 203374A. Eight of these electronic bands are seen in the interstellar medium for the first time. Our simultaneous fit of five non-Rydberg A-X bands together with the strongest Rydberg band of CO, C-X (0-0), yields a four-component cloud structure toward t…
QU Car: a very high luminosity nova-like binary with a carbon-enriched companion
Long, Knox S.; Drew, Janet E.; Hartley, Louise E. +1 more
QU Car is listed in cataclysmic variable star catalogues as a nova-like variable. This little-studied, yet bright interacting binary is re-appraised here in the light of new high-quality ultraviolet interstellar line data obtained with STIS on-board the Hubble Space Telescope. The detection of a component of interstellar absorption at a mean local…
On the location and composition of the dust in the MCG-6-30-15 warm absorber
Ballantyne, D. R.; Murray, N.; Weingartner, J. C.
The warm absorber observed in the Seyfert 1 galaxy MCG-6-30-15 is known to consist of at least two zones and very likely contains dust. Hubble Space Telescope images of MCG-6-30-15 show a dust lane crossing the galaxy just below the nucleus. In this paper, we argue that this dust lane is responsible for the observed reddening of the nuclear emissi…
Vesta's UV lightcurve: hemispheric variation in brightness and spectral reversal
Vilas, Faith; Hendrix, Amanda R.; Festou, Michel C.
Spectra of asteroid 4 Vesta obtained in October 1990 with the International Ultraviolet Explorer are reanalyzed and reinterpreted. A large portion of the eastern hemisphere (based on the prime meridian definition of Thomas et al., 1997a) is darker at UV wavelengths than much of the western hemisphere. The UV lightcurve is in contrast with the visi…
XMM observation of the dynamically young galaxy cluster CL 0939+4713
Schindler, S.; Castillo-Morales, A.; De Filippis, E.
We present an XMM observation of the distant galaxy cluster CL 0939+4713. The X-ray image shows pronounced substructure, with two main subclusters which have even some internal structure. This is an indication that the cluster is a dynamically young system. This conclusion is supported by the temperature distribution: a hot region is found between…
GRB 021125: The first GRB imaged by INTEGRAL
Götz, D.; Goldoni, P.; Mereghetti, S. +12 more
In the late afternoon of November 25th, 2002 a gamma-ray burst (GRB) was detected in the partially coded field of view (about 7.3deg from the centre) of the imager IBIS on board the INTEGRAL satellite. The instruments on-board INTEGRAL allowed, for the first time, the observation of the prompt gamma-ray emission over a broad energy band…