Gordon E. Bromage

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This is the first of a series of papers devoted to the investigation of a large sample of brightest cluster galaxies (BCGs), their kinematic and stellar population properties, and the relationships between those and the properties of the cluster. We have obtained high signal-to-noise ratio, long-slit spectra of these galaxies with Gemini and WHT with the(More)
We have acquired new time series photometry of the two pulsating DB white dwarf stars KUV05134+2605 and PG1654+160 with the Whole Earth Telescope. Additional single-site photometry is also presented. We use all these data plus all available archival measurements to study the temporal behaviour of the pulsational amplitudes and frequencies of these stars for(More)
The latest outburst of the recurrent nova RS Oph occurred in 2006 February. Photometric data presented here show evidence of the resumption of optical flickering, indicating reestablishment of accretion by day 241 of the outburst. Magnitude variations of up to 0.32 mag in V-band and 0.14 mag in B on time-scales of 600-7000 s are detected. Over the two week(More)
We present optical spectroscopic identification of sources identified in the BeppoSAX MECS fields of the High Energy LLarge Area Survey (HELLAS). In total 62 sources from a sample of 115 brighter than F5−10keV > 5×10 −14 cgs have been identified. We find a density of 13-21 sources/deg2 at F5−10keV > 5× 10 −14 cgs, which contribute to 20− 30 % of the hard(More)
We review the results of the 1988 multiwavelength campaign on the late-type eclipsing binary YY Geminorum. Observations include: broad-band optical and near-infrared photometry, simultaneous optical and ultraviolet (IUE) spectroscopy, X-ray (Ginga) and radio (VLA) data. From models fitted to the optical light curves, fundamental physical parameters have(More)
By examining solar observations using the Normal Incidence Spectrometer (NIS) within the Coronal Diagnostic Spectrometer (CDS) on board SOHO, an isothermal region in the lower solar corona was chosen for analysis by three different temperature diagnostic techniques. These techniques are the line-ratio method, the Differential Emission Measure and the(More)
the functions in the first test we compared results in the range ( 1 0 ( . 0 0 5 ) 0 ) , skipping the poles at the negative integers. All of the values in the second test were checked similarly. In the latter case, where published tables for negative arguments were available, this internal check proved sharp--whenever the internal check indicated an error(More)
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