Search Publications

Analysis of COS-B and HEAO-B satellite data of the pulsar Geminga

Wu, Mei; Ma, Lin; Ma, Yu-qian +4 more

We have made timing and spectral analyses of COS-B and HEAO-B satellite data of the pulsar Geminga and our results further confirm that Geminga is a pulsar with a strong γ emission and a weak X emission.

Multiwavelength Searches for the Counterpart to the May 1 1992 Gamma-Ray Burst

Cline, T.; Hurley, K.; Kouveliotou, C. +9 more

UV and X-ray emission in the interacting binary U Cephei.

Gonzalez-Riestra, R.; Guinan, E. F.; Gimenez, A.

The active close binary U Cep has been monitored in the ultraviolet, using IUE, during 1.25 orbital cycles. The emission spectrum at the bottom of the primary total eclipse confirms earlier suggestions of an unexpected absence of the Hell 1640 A line. Stronger than expected emission in some other lines like NV, CII, CIV or AlIII, indicative of hot…

Search for short bursts of gamma-ray emission in spark chamber data: application to COS-B

Buccheri, R.; Maccarone, M. C.; Fry, W. F.

We describe an analysis method aimed to the detection of short (<1000 s) bursts in the emission of gamma-ray sources using spark chamber data. The method utilizes a maximum likelihood technique which looks for accumulations of photons, compatible with the point spread function of the experiment, within the whole observing time and the field-of-…

"Giotto" - the second comet.

Schwehm, G. H.

The author reports on the "Giotto Extended Mission" to comet Grigg-Skjellerup. The investigations of Giotto have provided new data concerning the interaction of solar wind with a non-magnetized body in space.

Calibration of HST narrow band filters using the Orion Nebula.

Hu, Xihai

HST images in three emission line filters: Hα, [O III] and [N II] have been calibrated. The CCD sensitivity was determined by comparing regions within HST frames with the corresponding surface brightness determined from ground based Orion Nebula observations. Corrections for continuum within each filter were made. It was necessary to correct the […

Analysis of COS-B and HEAO-B satellite data of the pulsar Geminga

Song, Li-Ming; Wu, Mei; Ma, Yu-Qian +4 more

Timing and spectral analysis of COS-B and HEAO-B satellite data of the pulsar Geminga are presented. The results confirm that Geminga is a pulsar with a strong gamma emission and a weak X-ray emission. A phase histogram of Geminga in different energy ranges from a summation of four COS-B observations is given.

Radial Distribution of Ulysses Low Energy Proton Flux

Anglin, J. D.; Burrows, J. R.; Venkatesan, D. +1 more

X-ray studies of Be/X-ray binaries.

Saraswat, Priyamvada

In this thesis a study of some X-ray binaries in which a Be star is a primary has been undertaken in an effort to understand the nature of X-ray emission from these sources. The work attempts to answer questions regarding the structure of the circumstellar disk and its evolution with time. The thesis consists of two parts. The first part is devote…

Solar Wind Channels for MeV Particles

Bame, S. J.; Page, D. E.; Goldstein, B. G.