Search Publications
ALMA, ATCA, and Spitzer Observations of the Luminous Extragalactic Supernova SN 1978K
Kotak, R.; Ryder, S. D.; Smith, I. A. +2 more
Only three extragalactic supernovae have been detected at late times at millimeter wavelengths: SN 1987A, SN 1978K, and SN 1996cr. SN 1978K is a remarkably luminous Type IIn supernova that remains bright at all wavelengths 40 years after its explosion. Here, we present Atacama Large Millimeter/submillimeter Array (ALMA) observations taken in 2016 …
Kinetic Theory of Ion Acoustic Waves Observed at Comet 67P/Churyumov-Gerasimenko
Rehman, Saeed ur; Shah, Asif; Haque, Qamar ul
This work presents the resonance interaction of ion acoustic waves with the cometary plasma as observed at comet 67P/Churyumov-Gerasimenko. The plasma is comprised of cold, warm, and suprathermal electron populations and water ions such that the quasineutrality is satisfied. The cold electron population is found to play a dominant role in the damp…
Absolute parameters of young stars: HX Velorum
Demircan, O.; Özkardeş, B.; Erdem, A. +4 more
We present combined photometric and spectroscopic analyses of the southern multiple star HX Vel. High-resolution spectra of this system were taken at the University of Canterbury Mt. John Observatory in the years 2009-2015. Absolute parameters for HX Vel tend to confirm its young and near-main-sequence nature. We specify the main adopted parameter…
A high signal-to-noise HST spectrum towards J1009+0713: precise absorption measurements in the CGM of two galaxies
Nicastro, Fabrizio; Mathur, Smita; Weinberg, David H. +6 more
High signal-to-noise spectra towards background quasars are crucial for uncovering weak absorption in the circumgalactic medium (CGM) of intervening galaxies, such as the diagnostic lines of N V that provide insight to the ionization process of warm gas but typically have low equivalent widths. We present a new spectrum from the Hubble Space Teles…
Exploring the Asymmetry of the Solar Corona Electron Density with Very Long Baseline Interferometry
Pavlov, Dmitry; Melnikov, Alexey; Aksim, Dan +1 more
The Sun’s corona has interested researchers for multiple reasons, including the search for a solution to the famous coronal heating problem and a purely practical consideration of predicting geomagnetic storms on Earth. There exist numerous different theories regarding the solar corona; therefore, it is important to be able to perform comparative …
UV core dimming in coronal streamer belt and the projection effects
Abbo, L.; Giordano, S.; Ofman, L.
During solar minimum activity, the coronal structure is dominated by a tilted streamer belt, associated with the sources of the slow solar wind. It is known that some UV coronal spectral observations show a quite evident core dimming in heavy ions emission in quiescent streamers. In this paper, our purpose is to investigate this phenomenon by comp…
Open cluster kinematics with Gaia DR2 (Corrigendum)
Castro-Ginard, A.; Jordi, C.; Casamiquela, L. +16 more
The table with clusters velocities is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/623/C2
Differential astrometric framework for the Jupiter relativistic experiment with Gaia
Abbas, Ummi; Bucciarelli, Beatrice; Lattanzi, Mario G.
We employ differential astrometric methods to establish a small field reference frame stable at the microarcsecond (µas) level on short time-scales using high-cadence simulated observations taken by Gaia in 2017 February of a bright star close to the limb of Jupiter, as part of the relativistic experiment on Jupiter's quadrupole. We achieve …
Solar Neighborhood Kinematics from Gaia -LAMOST Dwarf Stars
Zhu, Z.; Liu, J. -C.; Ding, P. -J.
We use high-precision kinematic data from Gaia data release 2 (DR2) and spectroscopic data from Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) data release 5 (DR5) to explore the kinematics of solar neighborhood dwarf stars in the northern and southern sides of the Galactic plane. The metallicity range of the sampled stars is -…
Absolute Dimensions of the Early F-type Eclipsing Binary V506 Ophiuchi
Torres, Guillermo; Fekel, Francis C.; Muterspaugh, Matthew W. +1 more
We report extensive differential V-band photometry and high-resolution spectroscopic observations of the early F-type, 1.06-day detached eclipsing binary V506 Oph. The observations, along with times of minimum light from the literature, are used to derive a very precise ephemeris and the physical properties for the components, with the absolute ma…