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Precise Source Locations of Recent Gamma Ray Bursts
Hurley, K. C.; Fishman, G. J.; Kouveliotou, C. +9 more
How robust are the EGRET AGN gamma-ray identifications?
Bignami, G. F.; Caraveo, P.; Ciliegi, P.
Several AGNs have been proposed as identifications of gamma-ray sources discovered by CGRO. Using the NED database, the authors show that these AGNs are not the only extragalactic objects within the error boxes of the sources. Therefore, an in-depth study is needed on a case-by-case basis to access the most probable counterparts of the gamma-ray s…
Dependence of Ulysses Low-Energy Proton Flux on Solar Activity
Anglin, J. D.; Burrows, J. R.; Venkatesan, D. +1 more
Two-component continuum spectrum X-ray pulsar EXO2030+375
Li, T. P.; Cheng, L. X.; Sun, X. J. +1 more
We report the detection of a soft X-ray component in the spectrum of the transient X-ray pulsar EXO2030+375 at a high state in 1985. The spectrum of the soft X-ray component could be fitted by a blackbody with a temperature kT ∼1.1 keV and a radius of the emission areaR ∼ 3.6 - 6.1 km (assuming 5 kpc distance).
HST imaging of the wind-blown lobe NGC 6165.
Hester, J.; Scowen, P.; Code, A. +1 more
WFC observations of the lobe NGC 6165 have resolved clumps that are being photoevaporated by the intense UV radiation from HD 148937, in addition to the erosive effects of the strong stellar wind. The central object is a massive superluminous young star that is thought to be undergoing mass loss as it descends onto the main sequence. Analysis of s…
Ulysses over the pole of the Sun.
Young, S.
The Quality of Photometric Information in the HIPPARCOS Input Catalog
Casertano, Stefano; Ratnatunga, Kavan U.; Bell, David J. +1 more
Comparison with independent photoelectric photometry is used to assess the quality of magnitudes and colors in the Hipparcos Input Catalog. These magnitudes and colors will play an important role in the luminosity calibration of Hipparcos stars. We conclude that photoelectric photometry, available for about 37 percent of the catalog, is of uniform…
Planetary Camera Observations of NGC 1275: Discovery of a Central Population of Compact Massive Blue Star Clusters
Holtzman, J. A.; Faber, S. M.; Ewald, S. P. +10 more
We have discovered a population of bright blue pointlike sources within 5 kpc of the nucleus of NGC 1275 using HST Planetary Camera observations. The typical object has M_v_ ~ - 12 to - 14 (H_0_ = 75 km s^-1^ Mpc^-1^ ); the brightest has M_v_ ~ - 16. They are all blue, with V - R <~ 0.3. The color distribution and lack of excess Hα emission are…
The ULYSSES solar wind plasma experiment
McComas, D. J.; Goldstein, B. E.; Bame, S. J. +5 more
The scientific objectives of the Ulysses solar wind plasma experiment, termed the Solar Wind Observations Over the Poles of the Sun (SWOOPS) include measurements of the solar-wind global properties, the nonlinear MHD disturbances in the solar wind, the internal state of the solar wind plasma, and the solar-wind interaction with Jupiter's magnetic …
Intrinsic parameters of galactic luminous OB stars.
Butler, K.; Kudritzki, R. P.; Herrero, A. +3 more
We present the results of a spectroscopic analysis of 25 galactic luminous OB stars. The gravities are in general lower than previously assumed, especially for giants. The helium abundances are also higher than normal in many cases. Using data from the spectroscopic analysis, radii, luminosities and masses are derived. The observed wind terminal v…