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An evaluation of the correlation between open solar flux and total solar irradiance
Lockwood, M.
The correlation between the coronal source flux FS and the total solar irradiance ITS is re-evaluated in the light of an additional 5 years' data from the rising phase of solar cycle 23 and also by using cosmic ray fluxes detected at Earth. Tests on monthly averages show that the correlation with FS deduced from th…
A radio study of neutral gas and dust in the radio galaxy 3C 293
Beswick, R. J.; Holloway, A. J.; Pedlar, A.
We have observed broad HI absorption in the radio galaxy 3C 293 using Multi-Element Radio Linked Interferometric Network (MERLIN) at 0.2-arcsec angular resolution and the Giant Meterwavelength Radio Telescope (GMRT) at arcsec resolution. Extensive HI is found in absorption across the centre of this peculiar radio galaxy, allowing a detailed study …
The Nascent Bipolar Nebula Surrounding the Carbon-rich Variable CIT 6: Transition to Axisymmetry
Hines, Dean C.; Schmidt, Gary D.; Swift, Seth
CIT 6 is a luminous carbon star currently evolving off the asymptotic giant branch into a tiny proto-planetary nebula. The star is surrounded by a thick dust shell that reprocesses much of the photospheric radiation, making it one of the brightest infrared sources in the sky. Spacecraft imaging at optical and near-IR wavelengths demonstrates that …
Discovery of a new quadruply lensed QSO: HS 0810+2554 - A brighter twin to PG 1115+080
Reimers, D.; Hagen, H. -J.; Baade, R. +2 more
We announce the probable discovery of a new very bright gravitationally lensed QSO,
The Stellar Populations of the Cetus Dwarf Spheroidal Galaxy
Sarajedini, A.; Dolphin, A. E.; Grebel, E. K. +7 more
We present Hubble Space Telescope Wide Field Planetary Camera 2 photometry in the V and I passbands of the recently discovered Local Group dwarf spheroidal galaxy in Cetus. Our color-magnitude diagram extends from above the first-ascent red giant branch (RGB) tip to approximately half a magnitude below the horizontal branch (HB). Given a reddening…
Spatial and Compositional Constraints on Non-ice Components and H 2O on Pluto's Surface
Buie, M. W.; Grundy, W. M.
We present four new near-infrared spectra of Pluto, measured separately from its satellite Charon during four HST/NICMOS observations in 1998, timed to sample four evenly spaced longitudes on Pluto. Being free of contamination by telluric absorptions or by Charon light, the new data are particularly valuable for studies of Pluto's continuum absorp…
Circumnuclear Star Formation in the Spiral Galaxy NGC 3310
McGrath, Elizabeth J.; Elmegreen, Debra Meloy; Chromey, Frederick R. +1 more
The star-forming properties of the circumnuclear ring in the starburst spiral galaxy NGC 3310 have been studied in B, I, J, H, and K bands using images from KPNO and from the HST archives. The colors and magnitudes of the star-forming regions indicate ages less than 10 Myr and masses of 104 to 105 Msolar for the la…
A Hubble Space Telescope lensing survey of X-ray luminous galaxy clusters - III. A multiply imaged extremely red galaxy at z=1.6
Kneib, J. -P.; Smith, Graham P.; Smail, Ian +4 more
We present near-infrared spectroscopy and Hubble Space Telescope (HST) imaging of galaxy J003707+0909.5, the brightest of three gravitationally lensed images of an extremely red object (ERO) at z=1.6, in the field of the massive cluster A68 (z=0.255). We exploit the superlative resolution of our HST data and the enhanced spatial resolution and sen…
Rocket Observations of Far-Ultraviolet Dust Scattering in NGC 2023
Feldman, Paul D.; Burgh, Eric B.; McCandliss, Stephan R.
The reflection nebula NGC 2023 was observed by a rocket-borne long-slit imaging spectrograph in the 900-1400 Å bandpass on 2000 February 11. A spectrum of the star, as well as that of the nebular scattered light, was recorded. Through the use of a Monte Carlo modeling process, the scattering properties of the dust were derived. The albedo is low, …
10 Hygiea: ISO Infrared Observations
Barucci, M. A.; Morris, P.; Crovisier, J. +10 more
Observations of emissivity features of 10 Hygiea have been made for the first time in the relatively unexplored thermal-infrared wavelength region with the ISO (Infrared Space Observatory) satellite. Spectrophotomer (PHT-S) and short wavelength spectrometer (SWS) spectra of 10 Hygiea, obtained at 5.8-11.6 and 7-45 µm, respectively, are prese…