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The Vertical Extent of Enhanced Densities in Cusp Like Regions of the Ionosphere of Mars
Kopf, A. J.; Withers, P.; Golden-Marx, E.
Unusually large values of peak electron density in the ionosphere of Mars are occasionally observed in cusp like regions of crustal magnetic field. These features are observed as atypical examples of oblique echoes in ionograms. However, the vertical extent over which electron density values are enhanced has not yet been determined. Furthermore, t…
X-ray observations of two candidate symbiotic binaries in the galactic bulge
Maccarone, T. J.; Britt, Christopher T.; Torres, M. A. P. +6 more
This paper analyses X-ray observations by the Chandra X-ray Observatory of CXOGBS J174614.3-321949 (CXB3) and CXOGBS J173620.2-293338 (CX332), two symbiotic binary star candidates identified by the Galactic Bulge Survey. Using new Chandra observations, we improved their X-ray positional uncertainties to 0.24 and 0.92 arcsec, respectively, confiden…
Discovery of Romanov V20, an Algol-Type Eclipsing Binary in the Constellation Centaurus, by Means of Data Mining
Romanov, Filipp Dmitrievich
I report my discovery of the large-amplitude Algol-type eclipsing binary system which was initially added to the AAVSO International Variable Star Index (VSX) under the designation of Romanov V20. I describe selection criteria for searching for variability among other stars, the search of photometric data from several sky surveys, and my observati…
Irregular emission cycles in the Oe star HD 60 848
Nazé, Yaël; Fló, Joan Guarro; Rauw, Gregor +2 more
We analyse the spectroscopic and photometric variability of the Oe star HD 60 848 over the last twenty five years. The spectra reveal recurrent, but irregular cycles of increased circumstellar emission lines. These cycles are highly asymmetric displaying a slow increase over about 6 years, followed by a fast decay within about 6 months. Our analys…
Monoceros OB4: a new association in Gaia DR2
Alves, J.; Teixeira, P. S.; Scholz, A. +2 more
We use Gaia DR2 data to survey the classic Monoceros OB1 region and look for the existence of a dispersed young population, co-moving with the cloud complex. An analysis of the distribution of proper motions reveals a 20-30 Myr association of young stars, about 300-400 pc away from the far side of the Mon OB1 complex, along the same general line o…
The search for ultraviolet luminous objects in GALEX data
Zhao, Gang; Malkov, Oleg Yu; Karpov, Sergey V.
Selection of extreme objects in data from large-scale sky surveys is a powerful tool for the detection of new classes of astrophysical objects or rare stages of their evolution. The cross-matching of catalogues and analysis of the colour indices of their objects is the usual approach to this problem, which has already provided a lot of interesting…
Preservation and variation of ion-to-electron temperature ratio in the plasma sheet in geo-magnetotail
Chen, ChuXin
Primary Velocity and Orbital Phase Effects on Planetary Detectability from Small Epoch Number Data Sets
Benneke, Björn; Blake, Geoffrey A.; Pelletier, Stefan +2 more
Cross-correlation analyses of high-resolution spectroscopic data have recently shown great success in directly detecting planetary signals and enabling the characterization of their atmospheres. One such technique aims to observe a system at multiple epochs and combine the measured planetary radial velocities from each epoch into a measurement of …
Probing ultradiffuse galaxies out to the virial radius of the Coma cluster with XMM-Newton
Walker, S. A.; Mirakhor, M. S.
We probe the formation scenarios and the active galactic nucleus (AGN) occupation fraction of ultradiffuse galaxies (UDGs) in the nearby Coma cluster by utilizing XMM-Newton observations of 779 out of 854 UDG candidates identified by the Subaru survey. Their origin is probed by measuring the dark matter halo mass of the stacked sample of UDGs and …
Orbital Parameters and Binary Properties of 37 FGK Stars in the Cores of Open Clusters NGC 2516 and NGC 2422
Mateo, Mario; Bailey, John I., III; Roederer, Ian U. +4 more
We present orbits for 24 binaries in the field of open cluster NGC 2516 (~150 Myr) and 13 binaries in the field of open cluster NGC 2422 (~130 Myr) using results from a multiyear radial-velocity (RV) survey of the cluster cores. Six of these systems are double-lined spectroscopic binaries. We fit these RV variable systems with orvara, a MCMC-based…