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Modelling the effect of absorption from the interstellar medium on transient black hole X-ray binaries
Vaughan, S.; Wynn, G. A.; Eckersall, A. J.
All observations of Galactic X-ray binaries are affected by absorption from gas and dust in the interstellar medium (ISM) which imprints narrow (line) and broad (photoelectric edges) features on the continuum emission spectrum of the binary. Any spectral model used to fit data from a Galactic X-ray binary must therefore take account of these featu…
Hot DA white dwarf model atmosphere calculations: including improved Ni PI cross-sections
Barstow, M. A.; Holberg, J. B.; Hubeny, I. +2 more
To calculate realistic models of objects with Ni in their atmospheres, accurate atomic data for the relevant ionization stages need to be included in model atmosphere calculations. In the context of white dwarf stars, we investigate the effect of changing the Ni IV-VI bound-bound and bound-free atomic data on model atmosphere calculations. Models …
Multiwavelength monitoring of a very active dwarf nova AX J1549.8-5416 with an unusually high duty cycle
Gelfand, Joseph D.; Bernardini, Federico; Lewis, Fraser +5 more
We present the results of our analysis of new optical, ultraviolet (UV) and X-ray observations of a highly variable source - AX J1549.8-5416. Both the detection of several fast rise, exponential decay outbursts in the optical light curve and the lack of He II emission lines in the optical spectra suggest AX J1549.8-5416 is a cataclysmic variable o…
LISA Pathfinder first results
Vetrugno, D.
LISA Pathfinder (LPF) is an in-flight technological demonstrator designed and launched to prove the feasibility of sub-femto-g free fall of kilo-sized test masses (TM), an essential ingredient for the future gravitational wave observatory from space. Half a year after launch, the first results are available and show an incredibly well-performing i…
Energetic Electron Periodicities During the Cassini Grand Finale
Krupp, N.; Roussos, E.; Mitchell, D. G. +2 more
The Cassini F ring and Proximal orbits took the spacecraft closer to Saturn than any previous mission and allowed determination of energetic charged particles (E > 20 keV) in the inner magnetosphere of the planet. The periodicities of the energetic electrons show a remarkable consistency when analyzed using Lomb periodograms. From the beginning…
Cross-calibration of the Rosetta Navigation Camera based on images of the 67P comet nucleus
Statella, Thiago; Geiger, Bernhard
The Rosetta spacecraft carried a Navigation Camera (NavCam) for optical navigation in the vicinity of the comet. In order to facilitate the use of the data for quantitative scientific work, we performed a cross-calibration study based on images taken with the OSIRIS near-angle camera. For this purpose, we selected sets of images acquired roughly s…
The amplitude of the cross-covariance function of solar oscillations as a diagnostic tool for wave attenuation and geometrical spreading
Gizon, Laurent; Birch, Aaron C.; Nagashima, Kaori +1 more
Context. In time-distance helioseismology, wave travel times are measured from the two-point cross-covariance function of solar oscillations and are used to image the solar convection zone in three dimensions. There is, however, also information in the amplitude of the cross-covariance function, for example, about seismic wave attenuation.
Ai…
On the Relation of Silicates and SiO Maser in Evolved Stars
Jiang, Biwei; Liu, Jiaming
The SiO molecule is one of the candidates for the seed of silicate dust in the circumstellar envelope of evolved stars, but this opinion is challenged. In this work we investigate the relation of the SiO maser emission power and the silicate dust emission power. With both our own observation by using the PMO/Delingha 13.7 m telescope and archive d…
A Bayesian Approach to Period Searching in Solar Coronal Loops
McKenzie, David; Scherrer, Bryan
We have applied a Bayesian generalized Lomb-Scargle period searching algorithm to movies of coronal loop images obtained with the Hinode X-ray Telescope (XRT) to search for evidence of periodicities that would indicate resonant heating of the loops. The algorithm makes as its only assumption that there is a single sinusoidal signal within each lig…
Discovery of a Rapid, Luminous Nova in NGC 300 by the KMTNet Supernova Program
Kim, Dong-Jin; Lee, Yongseok; Moon, Dae-Sik +3 more
We present the discovery of a rapidly evolving transient by the Korean Microlensing Telescope Network Supernova Program (KSP). KSP is a novel high-cadence supernova survey that offers deep (∼21.5 mag in BV I bands), nearly continuous wide-field monitoring for the discovery of early and/or fast optical transients. KSP-OT-201509a, reported here, was…