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A Potential Supernova Remnant-X-Ray Binary Association in M31
Williams, Benjamin F.; Kong, Albert K. H.; Kolb, U. +3 more
The well-studied X-ray/optical/radio supernova remnant (SNR) DDB 1-15 (CXOM31 J004327.8+411829; r3-63) in M31 has been investigated with archival XMM-Newton and Chandra observations. The timing data from XMM-Newton reveal a power density spectrum (PDS) characteristic of accreting compact objects in X-ray binaries (XRBs). The PDS shows features typ…
Kinematics of Vega-like stars: Lifetimes and temporal evolution of circumstellar dust disks
Manoj, P.; Bhatt, H. C.
We have used the velocity dispersion as an age indicator to constrain the ages of a large sample of main sequence Vega-like stars in order to study the lifetimes and temporal evolution of the dust disks around them. We use Hipparcos measurements to compute stellar velocities in the sky plane. The velocity dispersion of Vega-like stars is found to …
Centre-to-limb variation of photospheric facular radiance and image resolution
Domingo, Vicente; Ortiz, Ada; Sanahuja, Blai +1 more
We study the effect of the angular resolution on the determination of the angular properties of the facular radiance. We analyze photospheric intensity in the continuum, around the Ni 676.8 nm line, and longitudinal magnetic field along the line of sight, measured by the MDI instrument aboard SOHO with two spatial resolutions, 4″ and 1.2″ (2″ and …
Simulations of high-latitude spots on Jupiter: Constraints on vortex strength and the deep wind
Morales-Juberias, Raul; Dowling, Timothy E.
We combine high-resolution observations of the dynamical behavior of small vortices (diameters ⩽5000 km) located at latitude 60°N on Jupiter with forward modeling, using the EPIC atmospheric model, to address two open questions: the dependence of the zonal winds with depth, and the strength of vortices that are too small to apply cloud tracking to…
Study of the Solar Cycle Dependence of Low-Degree p-Modes with Michelson Doppler Imager and VIRGO
Kosovichev, A. G.; Toutain, T.
Studying variations of observational properties of low-degree solar acoustic p-modes (radial, dipole, and quadrupole) with the activity cycle is important for understanding potential effects of the cycle in the deep interior, obtaining more accurate inversions for the sound speed and rotation, and also for estimating prospective investigation of s…
One-up on L1: Can X-rays provide longer advanced warning of solar wind flux enhancements than upstream monitors?
Kuntz, K. D.; Snowden, S. L.; Collier, M. R. +1 more
Observations of strong solar wind proton flux correlations with ROSAT X-ray rates along with high spectral resolution Chandra observations of X-rays from the dark Moon show that soft X-ray emission mirrors the behavior of the solar wind. In this paper, based on an analysis of an X-ray event observed by XMM-Newton resulting from charge exchange of …
Properties of galactic B[e] supergiants. V. Two-dimensional radiative transfer model of RY Sct and its dusty disc
Miroshnichenko, A. S.; Men'shchikov, A. B.
We present results of the first two-dimensional radiative transfer modelling of the eclipsing binary
Magnitude systems in old star catalogues
Yamaoka, Hitoshi; Fujiwara, Tomoko
The current system of stellar magnitudes originally introduced by Hipparchus was strictly defined by Norman Pogson in 1856. He based his system on Ptolemy's star catalogue, the Almagest, recorded in about AD137, and defined the magnitude-intensity relationship on a logarithmic scale.
Stellar magnitudes observed with the naked eye recorded in …High-energy pulse profile of the transient X-ray pulsar SAX J2103.5+4545
Goldoni, P.; Robba, N. R.; Bonnet-Bidaud, J. M. +6 more
Two recent INTEGRAL papers report a timing and spectral analysis of the transient Be/X-ray pulsar SAX J2103.5+4545 at high energies (5-200 keV). In this work we present for the first time a study of the pulse profile at energies above 20 keV using INTEGRAL data. The spin-pulse profile shows a prominent (with a duty cycle of 14%) and broad (with a …
The FIRST-Optical-VLA Survey for Lensed Radio Lobes
Muxlow, T. W. B.; Winn, Joshua N.; Kochanek, Christopher S. +7 more
We present results from a survey for gravitationally lensed radio lobes. Lensed lobes are a potentially richer source of information about galaxy mass distributions than lensed point sources, which have been the exclusive focus of other recent surveys. Our approach is to identify radio lobes in the Faint Images of the Radio Sky at Twenty cm (FIRST…