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Multicolour CCD measurements of visual double and multiple stars. III
Strigachev, A.; Lampens, P.; Duval, D.
Context: Recent CCD observations were performed in the period 1998-2004 for a large sample of visual double and multiple stars selected from the Hipparcos Catalogue and/or from the Gliese Catalogue of Nearby Stars.
Aims: Accurate astrometric and photometric data allowing us to characterise the individual components are provided. These data are…
Damp Mergers: Recent Gaseous Mergers without Significant Globular Cluster Formation?
Forbes, Duncan A.; Brodie, Jean P.; Strader, Jay +1 more
Here we test the idea that new globular clusters (GCs) are formed in the same gaseous (``wet'') mergers or interactions that give rise to the young stellar populations seen in the central regions of many early-type galaxies. We compare mean GC colors with the age of the central galaxy starburst. The red GC subpopulation reveals remarkably constant…
A compact dust shell in the symbiotic system HM Sagittae
Cruzalèbes, P.; Chesneau, O.; Sacuto, S. +1 more
Aims:We present high spatial resolution observations of the mid-infrared core of the dusty symbiotic system
Methods: The MIDI interferometer was used with the VLT Unit Telescopes and Auxiliary Telescopes providing baselines oriented from PA = 42° to 105°. The MIDI visibilities are compared with the ones predicted in …
Magnetic Properties of Metric Noise Storms Associated with Coronal Mass Ejections
Wang, Jing-Xiu; Wen, Ya-Yuan; Zhang, Yu-Zong
Using Nançay Radioheliograph (NRH) imaging observations, combined with SOHO/Michelson Doppler Imager (MDI) magnetogram observations and coronal magnetic field extrapolation, we studied the magnetic nature of metric noise storms that are associated with coronal mass ejections (CMEs). Four events are selected: the events of 2000 July 14, 2001 April …
Evidence for a binary companion to the central compact object 1E 1207.4-5209
Pavlov, George G.; Zavlin, Vyacheslav E.; Woods, Peter M.
Unique among neutron stars, 1E 1207.4-5209 is an X-ray pulsar with a spin period of 424 ms that contains at least two strong absorption features in its energy spectrum. This neutron star is positionally coincident with the supernova remnant PKS 1209-51/52 and has been identified as a member of the growing class of radio-quiet compact central objec…
Two-Step Reconnections in a C3.3 Flare and Its Preflare Activity Observed by Hinode XRT
Chae, Jongchul; Kim, Sujin; Kim, Yeon-Han +4 more
We investigated the evolution of a C3.3 impulsive flare and its preflare activity, which occurred in NOAA Active Region 10923 on 2006 November 12, using Hinode X-Ray Telescope (XRT) data. For an extensive investigation, we also used GOES X-ray flux, TRACE 171Å, and SOHO MDI data. Examining the time-series of the XRT and TRACE images, we can identi…
Observations of Comet 9P/Tempel 1 around the Deep Impact event by the OSIRIS cameras onboard Rosetta
Bertaux, Jean-Loup; Naletto, Giampiero; Debei, Stefano +36 more
The OSIRIS cameras on the Rosetta spacecraft observed Comet 9P/Tempel 1 from 5 days before to 10 days after it was hit by the Deep Impact projectile. The Narrow Angle Camera (NAC) monitored the cometary dust in 5 different filters. The Wide Angle Camera (WAC) observed through filters sensitive to emissions from OH, CN, Na, and OI together with the…
XMM-Newton observation of the classical T Tauri star SU Aurigae and the surrounding field
Audard, M.; Pallavicini, R.; Franciosini, E. +1 more
Aims: We investigate the properties of the X-ray emitting plasma of the classical T Tauri star SU Aurigae and of other sources in the field of view.
Methods: We use XMM-Newton to obtain a high-resolution RGS spectrum of SU Aur as well as EPIC imaging data and low-resolution spectra of the star and of other X-ray sources in the surrounding fiel…
Suzaku observations of cyclotron resonances in binary X-ray pulsars
Yonetoku, D.; Mihara, T.; Takahashi, H. +16 more
Since the typical magnetic field strengths of neutron stars reach 10 12 Gauss, the cyclotron resonance produced by a transition between Landau levels appears in the X-ray band. Systematic measurements of cyclotron absorption features in bright sources have been carried out extensively with Ginga, RXTE, BeppoSAX, and INTEGRAL. The cyclot…
Low surface brightness galaxies around the HDF-S. I. Object extraction and photometric results
Bomans, D. J.; Dettmar, R. -J.; Pohlen, M. +1 more
Aims:The aim of this study is to extend the parameter space for Low Surface Brightness (LSB) galaxies to reach lower central surface brightnesses, smaller sizes and higher number densities.
Methods: This study reports on photometric results of a search for LSB galaxies in a 0.76 deg2 field centered on the Hubble Deep Field-South (HD…