Search Publications
Orbital and stochastic far-ultraviolet variability in the nova-like system V3885 Sgr
Prinja, R. K.; Long, K. S.; Witherick, D. K. +2 more
Highly time-resolved time-tagged FUSE satellite spectroscopic data are analysed to establish the far-ultraviolet (FUV) absorption line characteristics of the nova-like cataclysmic variable binary, V3885 Sgr. We determine the temporal behaviour of low (Lyβ, C III, N III) and high (S IV, P V, O VI) ion species, and highlight corresponding orbital ph…
Radiation transfer in the cavity and shell of a planetary nebula
Zijlstra, A. A.; Gray, M. D.; Matsuura, M.
We develop an approximate analytical solution for the transfer of line-averaged radiation in the hydrogen recombination lines for the ionized cavity and molecular shell of a spherically symmetric planetary nebula. The scattering problem is treated as a perturbation, using a mean intensity derived from a scattering-free solution. The analytical fun…
Optical and X-ray observations of candidate isolated neutron stars in the G315.4-2.3 supernova remnant
Tiengo, A.; de Luca, A.; Mignani, R. P.
G315.4-2.3 is a young Galactic supernova remnant (SNR) whose identification as the remains of a Type II supernova (SN) explosion has been debated for a long time. In particular, recent multiwavelength observations suggest that it is the result of a Type Ia SN, based on spectroscopy of the SNR shell and the lack of a compact stellar remnant. Howeve…
Arcminute Microkelvin Imager observations of unmatched Planck ERCSC LFI sources at 15.75 GHz
AMI Consortium; Olamaie, Malak; Rodríguez-Gonzálvez, Carmen +16 more
The Planck Early Release Compact Source Catalogue includes 26 sources with no obvious matches in other radio catalogues (of predominantly extragalactic sources). Here we present observations made with the Arcminute Microkelvin Imager Small Array (AMI SA) at 15.75 GHz of the eight unmatched sources at δ > +10°. Of the eight, four are detected an…
First detailed analysis of multiple system V2083 Cyg
Zasche, P.; Svoboda, P.; Šlechta, M.
The main aim of this paper is the first detailed analysis of multiple system V2083 Cyg, to reveal its basic physical properties. The system was studied using the methods of light-curve and radial-velocity curve analysis, together with interferometric data from the visual pair obtained during the last century. It was found that the close subsystem …
Bursty synchrotron intensity variations of Jovian 6-cm radio emissions and Jupiter's quasi-periodic polar activities
Lou, Yu-Qing; Song, Huagang; Liu, Yinyu +1 more
With reference to Jupiter's south polar quasi-periodic 40-50 min (QP-40) activities and the model scenario for global QP-40 magneto-inertial oscillations of the Jovian inner radiation belt (IRB), we validate relevant predictions and confirmations by amassing empirical evidence from Ulysses, Cassini, Chandra, Galileo, XMM-Newton and the Advanced Co…
Bayesian approach to the cyclic activity of CF Oct
Hambaryan, V. V.; Borisova, A. P.; Innis, J. L.
The Bayesian statistical methods of Gregory-Loredo and the Bretthorst generalization of the Lomb-Scargle periodogram are used to study the activity cycles of the early K-type subgiant star CF Oct. We use a ∼45-yr-long data set derived from archival photographic observations, published photoelectric photometry, the Hipparcos data series and the All…
Exposing the hidden white dwarf binary origin by means of a synthetic population model for nearby single stars
Schröder, K. -P.; Dawson, S. A.
We present a new synthetic population model for local thin-disc (d≤ 100 pc) single-star white dwarfs (WDs), including effective temperature and mass distribution. The only two parameters of the synthetic population model are the initial mass function (IMF) and the star-formation rate (SFR). Depletion losses through kinematic heating of the stellar…