Search Publications
Accretion disc in the eclipsing binary AU Mon
Djurašević, G.; Vince, I.; Latković, O. +1 more
We analyse the CoRoT and V-passband ground-based light curves of the interacting close binary AU Mon, assuming that there is a geometrically and optically thick accretion disc around the hotter and more massive star, as inferred from the photometric and spectroscopic characteristics of the binary. Our model fits the observations very well and prov…
Kinetic study of a N2-CH4 afterglow plasma for production of N-containing hydrocarbon species of Titan’s atmosphere
Pintassilgo, C. D.; Loureiro, J.
We present the results from a self-consistent kinetic model simulating the afterglow of a flowing microwave discharge in pure N 2 in which CH 4 is introduced in the post-discharge. The simulation is carried out for a discharge operating at 433 MHz, in a tube of 1.9 cm inner radius, at the pressure range 26.6-133 Pa. In the po…
First Orbital Solution for the Non-thermal Emitter Cyg OB2 No. 9
Barbieri, C.; Damerdji, Y.; Morel, T. +7 more
After the first detection of its binary nature, the spectroscopic monitoring of the non-thermal radio emitter Cyg OB2 No. 9 (P = 2.4 yr) has continued, doubling the number of available spectra of the star. Since the discovery paper of 2008, a second periastron passage has occurred in 2009 February. Using a variety of techniques, the radial velocit…
A galaxy populations study of a radio-selected protocluster at z ~ 3.1
Pentericci, L.; Kajisawa, M.; Tanaka, I. +12 more
We present a population study of several types of galaxies within the protocluster surrounding the radio galaxy MRC 0316-257 at z ~ 3.1. In addition to the known population of Lyα emitters and [OIII] emitters, we use colour-selection techniques to identify protocluster candidates that are Lyman break galaxies (LBG) and Balmer break galaxies (BBGs)…
Sodium chloride as a geophysical probe of a subsurface ocean on Enceladus
Glein, Christopher R.; Shock, Everett L.
Recent data from the Cassini spacecraft suggest that an ocean exists inside Saturn's satellite Enceladus. Here, we show that the size of an ocean can be estimated if the NaCl concentration of the ocean is known. We find that concentrations of aqueous NaCl reported by Postberg et al. (2009) imply a relatively large ocean, comprising at least 17% by…
Determination of asteroid masses from their close encounters with Mars
Laskar, J.; Fienga, A.; Kuchynka, P. +1 more
An obstacle to the asteroid mass determination lies in the difficulty in isolating the gravitational perturbation exerted by a single asteroid on the planets, being strongly correlated and mixed up with those of many other asteroids. This hindrance may be avoided by the method of analysis presented here: an asteroid mass is estimated in correspond…
On the origin of M81 group extended dust emission
Elbaz, D.; Bock, J. J.; Clements, D. L. +57 more
Galactic cirrus emission at far-infrared wavelengths affects many extragalactic observations. Separating this emission from that associated with extragalactic objects is both important and difficult. In this paper we discuss a particular case, the M81 group, and the identification of diffuse structures prominent in the infrared, but also detected …
Long-term monitoring of LS I +61°303 with INTEGRAL
Rea, N.; Torres, D. F.; Zhang, S. +3 more
LS I +61°303 is one of the few high-mass X-ray binaries that has been recently observed at TeV and GeV energies. Here we investigate the hard X-ray spectral and timing properties of this source using the IBIS/ISGRI instrument on-board the INTEGRAL satellite. We carry out a systematic analysis based on all available INTEGRAL data since 2002 Decembe…
Detection of Parent H2O and CO2 Molecules in the 2.5-5 µm Spectrum of Comet C/2007 N3 (Lulin) Observed with AKARI
Nakagawa, Takao; Oyabu, Shinki; Hasegawa, Sunao +13 more
Comet C/2007 N3 (Lulin) was observed with the Japanese infrared satellite AKARI in the near-infrared at a post-perihelion heliocentric distance of 1.7 AU. Observations were performed with the spectroscopic (2.5-5.0 µm) and imaging (2.4, 3.2, and 4.1 µm) modes on 2009 March 30 and 31 UT, respectively. AKARI images of the comet exhibit a…
A Comparison of Methods for Determining the Age Distribution of Star Clusters: Application to the Large Magellanic Cloud
Whitmore, Bradley C.; Fall, S. Michael; Chandar, Rupali
The age distribution of star clusters in nearby galaxies plays a crucial role in evaluating the lifetimes and disruption mechanisms of the clusters. Two very different results have been recently found for the age distribution χ(τ) of clusters in the Large Magellanic Cloud (LMC). We found that χ(τ) can be approximately described by a power law χ(τ)…