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NGC 2660: Gaia DR2, ASteCA and the end of controversies?
Perren, G. I.; Pera, M. S.; Vázquez, R. A. +4 more
NGC 2660, an old and very compact open cluster placed at about 3 kpc from the Sun in a region of moderate absorption, has been subject of several photometric and spectroscopic studies in the past. Controversies arise in terms of its distance, age and metal content. Previous comparisons with cluster synthetic models carried out did not resolve them…
The Unusual Weak-line Quasar PG1407+265 and Its Foreground z 0.7 X-Ray Cluster
McDowell, Jonathan C.; Gallo, Luigi C.; Siemiginowska, Aneta +2 more
We present new observations of the odd z = 0.96 weak-line quasar PG1407+265, and report the discovery of CXOU J140927.9+261813, a z = 0.68 X-ray cluster. Archival X-ray photometry spanning nearly four decades reveals that PG1407+265 is variable at the 1 dex level on a timescale of years. V-band variability is observed with an amplitude less than 0…
Orbital eccentricities as indicators of stellar populations. II. Vertical velocity distribution from the Gaia DR2 catalogue
Cubarsi, R.; Stojanović, M.; Ninković, S.
Context. In previous work, we showed how the planar and vertical eccentricities of disc stars, e and e′, could be used as indicators of the stars' kinematic populations. For a local stellar sample drawn from the Gaia DR2 catalogue, these populations were represented geometrically in the eccentricity diagram, e′2 vs. e2, appro…
Impact of the Solar Wind Dynamic Pressure on the Field-Aligned Currents in the Magnetotail: Cluster Observation
Dandouras, I.; Dunlop, M. W.; Rème, H. +6 more
We statistically investigate the influence of the solar wind dynamic pressure (SW Pdyn) on the field-aligned currents (FACs) in the magnetotail with 1,492 FAC cases from July to October in 2001 and 2004, which covers 74 Cluster crossings of the plasma sheet boundary layer (PSBL) in both storm time and non-storm time. The FAC density in …
Reducing loss of significance in the computation of Earth-based two-way Doppler observables for small body missions
Li, Fei; Ye, Mao; Barriot, Jean-Pierre +5 more
Two-way Doppler measurement is a typical Earth-based radiometric technique for interplanetary spacecraft navigation and gravity science investigation. The most widely used model for the computation of two-way Doppler observables is Moyer's differenced-range Doppler (DRD) formula, which is based on a Schwarzschild approximation of the Solar-System …
Absolute parameters of young stars: PU Pup
Erdem, Ahmet; Sürgit, Derya; Budding, Edwin +2 more
We present combined photometric and spectroscopic analyses of the southern binary star PU Pup. High-resolution spectra of this system were taken at the University of Canterbury Mt. John Observatory in the years 2008 and again in 2014-2015. We find the light contribution of the secondary component to be only ~2% of the total light of the system in …
Photometric and period analysis of the eclipsing binary system V2783 Ori
Bulut, İ.; Bulut, A.
In this study we performed the first detailed photometric and period analysis of the recently discovered eclipsing binary star V2783 Ori. The analysis of the light curve has shown that the system is in a detached configuration, with the orbital eccentricity e = 0.274 ± 0.008. The photometric mass ratio of V2783 Ori determined from the light curve …
Search for Magnetars in the Galaxy M31 as Periodic X-ray Sources Based on XMM-Newton Data
Popov, S. B.; Pshirkov, M. S.; Zolotukhin, I. Yu.
Several years ago a series of powerful millisecond radio bursts with close dispersion measures was detected toward the galaxy M31. Taking the hypothesis about the possible association of these radio bursts with a magnetar in M31 as a starting point, we have searched for periodic X-ray signal sources using data from the XMM-Newton X-ray telescope. …
The Evolution of the Luminosity Function for Luminous Compact Blue Galaxies to z = 1
Pisano, D. J.; Bershady, M. A.; Crawford, S. M. +2 more
Luminous compact blue galaxies (LCBGs) are compact, star-forming galaxies that are rarely observed in the local universe but abundant at z = 1. This increase in LCBG number density over cosmic lookback time roughly follows the increase in the star formation rate density of the universe over the same period. We use publicly available data in the CO…
Dynamics of material ejected from the Hatmehit depression and landslides on comet 67P/Churyumov-Gerasimenko
Czechowski, Leszek; Kossacki, Konrad J.
In this work we investigate trajectories and regions of deposition of material ejected from depression Hatmehit on comet 67P/Churyumov-Gerasimenko. This depression, located on the lobe Head, could be a result of endogenic, possibly still ongoing, activity. We calculated trajectories of the ejecta with different initial velocities and we determined…