Search Publications
The Seyfert-Liner Galaxy NGC 7213: An XMM-Newton Observation
Page, M. J.; Branduardi-Raymont, G.; Soria, R. +3 more
We examine the XMM X-ray spectrum of the low-ionisation nuclear emission-line region (LINER)-AGN NGC 7213, which is best fit with a power law, Kα emission lines from Fe I, Fe XXV and Fe XXVI and a soft X-ray collisionally ionised thermal plasma with kT = 0.18+0.03‑0.01 keV. We find a luminosity of 7× 10‑4 LEdd…
An overview of the scientific objectives and technical configuration of the NeUtral Atom Detector Unit (NUADU) for the Chinese Double Star Mission
Barabash, S.; Dandouras, I.; Roelof, E. C. +12 more
The scientific objectives of an advanced NeUtral Atom Detector Unit (NUADU) designed for the Chinese Double Star Polar Mission, which is scheduled for launch in July 2004, are described. The potential during this mission to realize, hitherto unprecedented, integrated studies of global dynamic magnetospheric processes through combining with NUADU d…
Far-Ultraviolet and Optical Observations of BW Vulpeculae
Smith, Myron A.; Fullerton, Alex W.; Sterken, Christiaan
We have compared the behavior of 39 Far-Ultraviolet Spectroscopic Explorer spectra through the pulsation cycle of the very large amplitude β Cephei star BW Vul with optical and UV (IUE) spectra, as well as optical photometry. The FUSE light curve suggests a temperature amplitude of about 4000 K, while the radial velocity curve is similar to corres…
Some implications of the introduction of scattered starlight in the spectrum of reddened stars
Zagury, Frédéric
This paper presents new investigations on coherent scattering in the forward direction (orders of magnitude; conservation of energy; dependence of scattered light on geometry and wavelength), and on how scattered light contamination in the spectrum of reddened stars is possibly related to as yet unexplained observations (the diminution of the 2200…
Astrometric Solution of the Multiple System Xy Leo
Erdem, Ahmet; Bakis, Volkan; Budding, Edwin +2 more
An astrometric solution, together with time of minimum analysis, has been made for the multiple system XY Leonis (HIP 49136) to identify the properties of the remote companion to the eclipsing pair (AB). From this solution, we derive the inclination of the wide orbit (AB-cd) as 94.4∘± 0.2∘, angle of nodes as 247.3∘…
uvby FCAPT Photometry of the Magnetic Chemically Peculiar Stars 36 Aurigae, HR 2722, 13 Andromedae, and HD 220147
Adelman, Saul J.
Differential Strömgren uvby observations obtained with the Four College Automated Photoelectric Telescope (FCAPT) are presented for the magnetic chemically peculiar (mCP) stars 36 Aur, HR 2722, 13 And, and HD 220147. The new data help to better define the light curves. The period for 36 Aur was found to be 14.368 days, close to that for the previo…
A case study testing the cavity mode model of the magnetosphere
Sarafopoulos, D. V.
Based on a case study we test the cavity mode model of the magnetosphere, looking for eigenfrequencies via multi-satellite and multi-instrument measurements. Geotail and ACE provide information on the interplanetary medium that dictates the input parameters of the system; the four Cluster satellites monitor the magnetopause surface waves; the POLA…
A remarkable double helix in the V838 Mon nebula
Carlqvist, P.
In the beginning of 2002 the previously unnoted star V838 Mon had a powerful outburst. The star is surrounded by pre-existing, dusty clouds which are illuminated by the star in an expanding, parabolic layer. Spectacular images captured by the Hubble Space Telescope Advanced Camera for Surveys show that the clouds are to a great extent built up by …
HST/FOS time-resolved spectral mapping of IP Pegasi at the end of an outburst
Horne, K.; Saito, R. K.; Baptista, R.
We report an eclipse mapping analysis of time-resolved ultraviolet spectroscopy covering three eclipses of the dwarf nova IP Pegasi on the late decline of the 1993 May outburst. The eclipse maps of the first run show evidence of one spiral arm, suggesting that spiral structures may still be present in the accretion disc 9 days after the onset of t…
The merging cluster Abell 85 caught between meals by XMM-Newton
Durret, Florence; Lima Neto, Gastão B.; Forman, William
Our XMM-Newton observations of Abell 85 confirm the extended 4 Mpc filament first detected with ROSAT, which has an X-ray temperature of about ∼2 keV and is probably made of groups falling on to the cluster. A comparison of the temperature map with numerical simulations show that Abell 85 had intense merging activity in the past and is not fully r…