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A catalogue of oxygen-rich pulsating giants in the Galactic halo and the Sagittarius stream
Kendall, T. R.; Mauron, N.; Maurin, L. P. A.
To construct a catalogue of oxygen-rich (M) asymptotic giant branch (AGB) stars in the halo, complementing the catalogues of carbon-rich (C) stars, previous lists of Miras and SRa semi-regulars located in the northern hemisphere are merged and cleaned of various defects. After putting aside known C stars, characteristics such as colours and period…
A distortion solution for the Bok telescope with four CCD chips
Wang, N.; Peng, Q. Y.; Zhou, X. +2 more
The Beijing-Arizona Sky Survey (BASS) is an imaging survey that uses the 2.3-m Bok telescope at Kitt Peak. In order to realize the astrometric potential of the Bok telescope and improve the astrometry of BASS, a distortion solution for the Bok telescope is needed. In the past, we used a single lookup table to correct all the positional errors. How…
Data-driven modelling of the Van Allen Belts: The 5DRBM model for trapped electrons
Kretschmar, Peter; Ness, Jan-Uwe; Kuulkers, Erik +10 more
The magnetosphere sustained by the rotation of the Earth's liquid iron core traps charged particles, mostly electrons and protons, into structures referred to as the Van Allen Belts. These radiation belts, in which the density of charged energetic particles can be very destructive for sensitive instrumentation, have to be crossed on every orbit of…
Soft and hard X-ray dips in the light curves of γ Cassiopeiae
Smith, M. A.; Lopes de Oliveira, R.
The available six archival XMM-Newton observations of the anomalous X-ray emitter γ Cas (B0.5 IVe) have been surveyed for the presence of soft X-ray `dips' in X-ray light curves. In addition to discovering such events in the soft band (≤2 keV), we show that sometimes they are accompanied by minor, nearly simultaneous dips in the hard X-ray band. H…
Survey of Saturn Whistler Mode Hiss Intensity
Kurth, W. S.; Averkamp, T. F.; Menietti, J. D.
We have conducted an extensive survey of whistler mode hiss emission at Saturn using nearly the complete data set from the Cassini Radio and Plasma Wave Science investigation. We distinguish the hiss emission by frequency and intensity threshold criteria. The survey includes all longitudes and latitudes >25° for r < 10 RS, limited…
A likely runaway star cluster in the outer disc of the Large Magellanic Cloud
Grebel, Eva K.; Piatti, Andrés E.; Salinas, Ricardo
We present results from photometric and spectroscopic data obtained with SOAR and Gemini observatory facilities in the field of a recently discovered star cluster. The cluster, projected towards the Eastern side of the outer disc of the Large Magellanic Cloud (LMC), was originally placed nearly 10 kpc behind the LMC with an age and metallicity typ…
Determination of Plasma, Pickup Ion, and Suprathermal Particle Spectrum in the Solar Wind Frame of Reference
Wimmer-Schweingruber, R. F.; Pogorelov, N. V.; von Steiger, R. +4 more
Particle spectra directly measured by a plasma or low-energy particle experiment on spacecraft often contain instrumental effects due to a limited field of view or angular resolution. It is because the particle distribution function at low energies is highly anisotropic in the spacecraft frame of reference, in which the measurements are made. In t…
Origin of Phobos grooves: Testing the Stickney Crater ejecta model
Head, James W.; Ramsley, Kenneth R.
The model of Wilson and Head (1989, 2005, 2015) interprets the grooves of Phobos as the product of sliding, rolling, and bouncing ejecta boulders from the Stickney Crater impact. To test the model of Wilson and Head (1989, 2005, 2015) we apply a dynamical physics simulation to a three-dimensional shape model of Phobos and systematically assess six…
Currents Associated With Saturn's Intra-D Ring Azimuthal Field Perturbations
Dougherty, M. K.; Cowley, S. W. H.; Bunce, E. J. +4 more
During the final 22 full revolutions of the Cassini mission in 2017, the spacecraft passed at periapsis near the noon meridian through the gap between the inner edge of Saturn's D ring and the denser layers of the planet's atmosphere, revealing the presence of an unanticipated low-latitude current system via the associated azimuthal perturbation f…
Galaxy properties derived with spectral energy distribution fitting in the Hawaii-Hubble Deep Field-North
Xue, Yong-Quan; Gao, Fang-You; Li, Jun-Yao
We compile multi-wavelength data from ultraviolet to infrared (IR) bands as well as redshift and source-type information, for a large sample of 178 341 sources in the Hawaii-Hubble Deep Field-North field. A total of 145 635 sources among the full sample are classified/treated as galaxies and have redshift information available. We derive physical …