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The stellar populations of M33's outer regions - IV. Inflow history and chemical evolution
Sarajedini, A.; Barker, Michael K.
We have modelled the observed colour-magnitude diagram (CMD) at one location in M33's outskirts under the framework of a simple chemical evolution scenario which adopts instantaneous and delayed recycling for the nucleosynthetic products of Type II and Ia supernovae. In this scenario, interstellar gas forms stars at a rate modulated by the Kennicu…
Cluster geometry and inclinations from deprojection uncertainties. Cluster geometry and inclination
Chakrabarty, D.; Russell, H.; de Filippis, E.
Context: The determination of cluster masses is a complex problem that would be aided by information about the cluster shape and orientation (with respect to the line-of-sight).
Aims: It is in this context, that we have developed a scheme for identifying the intrinsic morphology and inclination of a cluster, by looking for the signature of the…
Short-Lived Absorptive Type III-like Microwave Bursts as a Signature of Fragmented Electron Injections
Chen, Bin; Yan, Yihua
In this paper, we devote ourselves to interpreting the short-lived absorptive type III-like microwave bursts in the 2006 December 13 flare event observed with high temporal and spectral resolutions (8 ms and 10 MHz) by the Chinese Solar Broadband Radio Spectrometer (SBRS/Huairou) at 2.6-3.8 GHz. In the decimeter-centimeter wavelength range, we fir…
Synthetic photometry of speckle interferometric binaries
Al-Wardat, M. A.
The synthetic magnitudes and color indices of 46 speckle interferometric stars have been computed depending on their observational spectral energy distributions. The Strömgren vby and Tycho BV passbands have been used to calculate magnitudes of the systems. These data when combined with the magnitude differences of the sub-components from speckle …
Influence of the tilt angle on the bow shock shape and location
Merka, J.; Šafránková, J.; Jelínek, K. +1 more
The bow shock is created in front of an obstacle immersed into a supersonic flow and its location depends on the size and shape of the obstacle. It was found that the obstacle (magnetopause) is scaled with the solar wind dynamic pressure and changes its dimensions and shape with the dipole tilt angle and interplanetary magnetic field orientation. …
Discovery of thermal X-ray emission in the supernova remnant G337.8-0.1 (Kes 41)
Combi, J. A.; Martí, J.; Albacete-Colombo, J. F.
Aims: We report here on the first detection at X-ray wavelengths of the Supernova Remnant (SNR) G337.8-0.1, carried out with the XMM-Newton Observatory.
Methods: Using the X-ray observations, we studied the X-ray morphology of the remnant at different energy ranges, analysed the spectral properties and investigated a possible variable behavior…
Possible Suzaku detection of non-thermal X-ray signals from a rotating magnetized white dwarf
Mukai, K.; Nakamura, R.; Enoto, T. +7 more
Although rotating neutron stars (NSs) have been regarded as being textbook examples of astrophysical particle acceleration sites for decades, details of the acceleration mechanism remain a mystery; for example, we cannot yet observationally distinguish “polar cap” models from “outer gap” models. To solve the model degeneracy, it is useful to study…
Spatial Distributions of Dust and Polycyclic Aromatic Hydrocarbons in the Nearby Elliptical Galaxy NGC 4589 Observed with AKARI
Onaka, Takashi; Sakon, Itsuki; Kaneda, Hidehiro +2 more
We report on near- to far-infrared (IR) observations of the nearby elliptical galaxy NGC 4589 by AKARI. NGC 4589 has acomplex stellar rotation field with aposition angle difference of 45° between the kinematic and morphological axes, although its morphology shows asmooth optical profile that closely follows the de Vaucouleurs law. The galaxy has a…
Three X-ray transients in M ;31 observed with Swift
Stiele, H.; Pietsch, W.; Haberl, F. +5 more
Aims: The purpose of this study is to find transient X-ray sources in M 31 and to investigate and classify their nature.
Methods: Three X-ray transients were observed with Swift. For each of the three X-ray transients, we used the Swift X-ray and optical data with observations from XMM-Newton and Chandra to investigate the lightcurves and the …
Discovery of a [WO] central star in the planetary nebula Th 2-A
Gamen, R.; Díaz, R. J.; Weidmann, W. A. +1 more
Context: About 2500 planetary nebulae are known in our Galaxy but only 224 have central stars with reported spectral types in the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker et al. 1992; Acker et al. 1996).
Aims: We have started an observational program aiming to increase the number of PN central stars with spectral classific…