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``Resolving" neutron stars physics and geometry
Caraveo, P. A.
The unprecedented harvest of X-ray photons detected from dozens of isolated neutron stars has made it possible to glimpse at their emission mechanisms as well as at their emission geometry. Rotating hot spot(s), superimposed to the global thermal emission from the neutron star surface, are seen from several objects, allowing to probe the stars' ex…
The Huygens Surface Science Package sound speed measurements and the methane content of Titan's atmosphere
Zarnecki, John C.; Lorenz, Ralph D.; Hagermann, A. +6 more
X-Ray observations of the Galactic Centre with Suzaku
Koyama, K.; Nobukawa, M.; Mori, H. +2 more
We report on the diffuse X-ray emission from the Galactic Centre (GCDX) observed with the X-ray Imaging Spectrometer (XIS) on board the Suzaku satellite. The highly accurate energy calibration and extremely low background of the XIS provide many new facts on the GCDX. These are (1) the origin of the lines at 6.7 and 7.0 keV is collisional excitati…
Compiled catalog of the proper motions and infrared photometry of stars at the north Galactic pole
Rybka, S. P.; Yatsenko, A. I.
We describe the procedure we used to compile a catalog of the proper motions of 23 633 stars in the sky area covering about 700 square degrees at the north Galactic pole. The compiled catalog combines the data from the UCAC2, Tycho-2, and FONAC catalogs for stars down to V ∼ 14m in this sky area. In addition to proper motions, the catal…
Extracting oscillation frequencies from sparse spectra: Fourier analysis
Jerzykiewicz, M.
I begin by explaining the properties of spectral windows of time-series data. Emphasis is on data obtained at a single geographic longitude, but ground-based multi-longitude cam- paigns and space missions such as MOST and Hipparcos are not entirely neglected. In the second section, I consider the Fourier transform of time-series data and the proce…
Possibility to detect the cluster emission up to R200 with XMM-Newton data
Sauvageot, J. -L.; Solovyeva, L.; Anokhin, S.
We present the results of analysis XMM-Newton data of galaxy cluster CL0016+16, which enables us to trace X-ray emission and temperature profile up to the virial radius. We obtained similar results using three different backgrounds. We checked the possibility of detection of cluster emission up to the virial radius with XMM-Newton data with hydrod…
Radial diffusion coefficients of 1-30 MeV protons in the outer heliosphere
Kecskeméty, K.; Logachev, Yu. I.; Zeldovich, M. A.
Radial variations of quiet-time fluxes of ~1-30 MeV protons are examined at distances of 2-85 AU using Voyager 1-2 (LECP, CRS) and Ulysses (LET) data. Attention is focused on the solar cycle minima of 1985-87 and 1995-97. Gradient values calculated from particle fluxes show an increase between 30 and 70 AU during the recovery phases of galactic co…
Is PZ MON a Red Dwarf or a Red Giant?
Sergeev, S. G.; Bondar', N. I.
Hipparcos data (ESA 1997) give for PZ Mon a parallax π = 0.71 +- 1.17 mas that is not in agreement with earlier estimations of distance to the star of 15-30 ps and with its status of K- dwarf. There are presented spectra of PZ Mon in the region 3750-6150 Α with resolution of 7 ≈ Α, which were carried out in the Nasmith focus of 2.6 m reflector in …
XMM-Newton: The next decade for cool star research
Schmitt, J. H. M. M.
In this article I will highlight selected results from XMM-Newton observations of stellar coronae, emphasizing the specific XMM-Newton capabilities in terms of high-resolution spectroscopy, its long-look capability and its optical monitor. I will focus on results on ``normal", cool stars and present science areas hitherto largely unexploired by XM…
The XMM-Newton view of magnetars
Tiengo, A.; Mereghetti, S.; Esposito, P.
Anomalous X-ray Pulsars and Soft Gamma-ray Repeaters are believed to be magnetars: isolated neutron stars powered by the decay of extremely high magnetic fields. We review some of the main results obtained with \xmm and discuss the prospects for future observations of this small but extremely interesting class of objects.