Search Publications
Correlated spectral variability in brown dwarfs
Bailer-Jones, C. A. L.
Models of brown dwarf atmospheres suggest they exhibit complex physical behaviour. Observations have shown that they are indeed dynamic, displaying small photometric variations over time-scales of hours. Here, I report results of infrared (0.95-1.64 µm) spectrophotometric monitoring of four field L and T dwarfs spanning time-scales of 0.1-5.…
Large-scale horizontal flows in the solar photosphere. II. Long-term behaviour and magnetic activity response
Švanda, M.; Sobotka, M.; Klvaňa, M. +1 more
We have developed a method to map large-scale horizontal velocity fields in the solar photosphere. The method was developed, tuned, and calibrated using synthetic data. Now, we apply the method to the series of Michelson Doppler Imager (MDI) Dopplergrams covering almost one solar cycle to generate the information about the long-term behaviour of s…
A Chandra Look at Five of the Broadest Double-Peaked Balmer Line Emitters
Brandt, W. N.; Eracleous, Michael; Garmire, Gordon +1 more
We study the 0.5-10 keV emission of a sample of five of the broadest double-peaked Balmer line emitters with Chandra. The Balmer lines of these objects originate close (within a few hundred gravitational radii) to the central black holes of the active galactic nuclei (AGNs), and their double-peaked profiles suggest an origin in the AGN accretion d…
In search of RR Lyrae type stars in eclipsing binary systems. OGLE052218.07-692827.4: an optical blend
Prša, A.; Guinan, E. F.; Devinney, E. J. +1 more
During the OGLE-2 operation, Soszynski et al. (2003) found 3 LMC candidates for an RR Lyr-type component in an eclipsing binary system. Two of those have orbital periods that are too short to be physically plausible and hence have to be optical blends. For the third, OGLE052218.07-692827.4, we developed a model of the binary that could host the ob…
Comparison of local energy conversion estimates from Cluster with global MHD simulations
Dandouras, I.; Buchert, S.; Vaivads, A. +3 more
The local energy conversion across the magnetopause has been estimated with Cluster for two magnetopause crossings. A load region, conversion from magnetic to particle energy, was identified on the dayside high-latitude magnetopause during south/dawnward IMF. Another crossing of the dawn flank magnetotail during dominantly duskward IMF was identif…
Near ultraviolet-infrared colours of red-sequence galaxies in local clusters
Hudson, Michael J.; Lucey, John R.; Smith, Russell J. +2 more
We present GALEX near-ultraviolet (NUV) and Two-Micron All-Sky Survey J-band photometry for red-sequence galaxies in local clusters. We define quiescent samples according to a strict emission threshold, removing galaxies with very recent star formation. We analyse the NUV-J colour-magnitude relation (CMR) and find that the intrinsic scatter is an …
Minor Ion Abundances in the Slow Solar Wind
Wurz, P.; Karrer, R.; Giammanco, C.
In this paper we report for the first time the absolute abundance of P (AP = 6.1 +/- 0.5), Al (AAl = 7.2 +/- 0.2), K (AK = 5.7 +/- 0.4), and Na (ANa = 6.5 +/- 0.3) in the slow solar wind for three wind speed ranges (380, 390, 400 km s-1, with a tolerance of ±2 km s-1) using 4 years …
GRB 070707: the first short gamma-ray burst observed by INTEGRAL
McGlynn, S.; McBreen, S.; Foley, S. +4 more
Context: INTEGRAL has observed 47 long-duration GRBs (T90 ≳ 2 s) and 1 short-duration GRB (T90 ≲ 2 s) in five years of observation since October 2002.
Aims: This work presents the properties of the prompt emission of GRB 070707, which is the first short hard GRB observed by INTEGRAL.
Methods: The spectral and temporal…
H I and CO in the circumstellar environment of the oxygen-rich AGB star RX Leporis
Winters, J. M.; Le Bertre, T.; Libert, Y. +1 more
Context: Circumstellar shells around AGB stars are built over long periods of time that may reach several million years. They may therefore be extended over large sizes ( 1 pc, possibly more), and different complementary tracers are needed to describe their global properties.
Aims: We set up a program to explore the properties of matter in the…
The efficient low-mass Seyfert MCG-05-23-016
Gehrels, N.; Petrucci, P. -O.; Shrader, C. R. +5 more
Aims: The Seyfert 1.9 galaxy MCG-05-23-016 has been shown to exhibit a complex X-ray spectrum. This source has moderate X-ray luminosity, hosts a comparably low-mass black hole, but accretes at a high Eddington rate, and allows us to study a super massive black hole in an early stage.
Methods: Three observations of the INTEGRAL satellite simul…