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Infrared Spectroscopy of the Recent Outburst in V1047 Cen (Nova Centauri 2005)
Udalski, A.; Mróz, P.; Munari, U. +14 more
Fourteen years after its eruption as a classical nova (CN), V1047 Cen (Nova Cen 2005) began an unusual re-brightening in 2019 April. The amplitude of the brightening suggests that this is a dwarf nova (DN) eruption in a CN system. Very few CNe have had DN eruptions within decades of the main CN outburst. The 14 yr separating the CN and DN eruption…
2MASS J10274572+0629104: the very short period young M6 dwarf binary system identified in K2 data
Burgasser, A. J.; Gizis, J. E.; Paudel, R. R. +1 more
We report the identification of a very low mass new binary system 2MASS J10274572+0629104, based on Kepler K2 photometry and Gaia DR2 astrometry. It is located at a distance of 90.0 ± 2.9 pc. The K2 light curve is consistent with a beat pattern of two periodic signals, and using Lomb-Scargle periodogram, we find two rotation periods of 0.2114 ± 0.…
PY Boo and NSVS 7328383: Two totally-eclipsing W UMa stars with small mass ratios and close parameters
Popov, Velimir A.; Petrov, Nikola I.; Kjurkchieva, Diana P.
Photometric observations of the W UMa binaries PY Boo and NSVS 7328383 with periods of around 0.27 d are presented. The light curve solutions reveal that the components of both targets are stars of K type (temperatures T1=4770 K, T2=5080 K and T1=5146 K, T2=5056 K, respectively,) and undergo total eclips…
Measurement of plasma channels in the Venus wake
Lundin, R.; Futaana, Y.; Zhang, T. L. +1 more
Plasma channels have been suggested to account for the observation of ionospheric holes in the Venus nightside ionosphere. They are produced by the erosion of the solar wind on the magnetic polar regions of the Venus ionosphere, and are related to a sharp plasma transition that extends along the flanks of the wake and that is located downstream fr…
A statistical study of CME-associated flare during the solar cycle 24
Beheary, M. M.; Shaltout, Abdelrazek M. K.; Amin, Eid A. +1 more
We investigate on the relationship between flares and coronal mass ejections (CMEs) in which a flare started before and after the CME events which differ in their physical properties, indicating potentially different initiation mechanisms. The physical properties of two types flare-correlated CME remain an interesting and important question in spa…
Comprehensive Determination of the Hinode/EIS Roll Angle
Warren, Harry P.; Brooks, David H.; Baker, Deborah +5 more
We present a new coalignment method for the EUV Imaging Spectrometer (EIS) on board the Hinode spacecraft. In addition to the pointing offset and spacecraft jitter, this method determines the roll angle of the instrument, which has never been systematically measured, and which is therefore usually not corrected. The optimal pointing for EIS is com…
Seasonal variation of north-south asymmetry in the intensity of Saturn Kilometric Radiation from 2004 to 2017
Morioka, Akira; Tsuchiya, Fuminori; Misawa, Hiroaki +9 more
This study investigates the long-term variation of Saturn Kilometric Radiation (SKR) intensity observed by the Radio and Plasma Wave Science (RPWS) instrument on board the Cassini spacecraft from 2004 (southern summer) to 2017 (northern summer). The results show that the SKR intensity was brighter in the summer hemisphere than in the winter hemisp…
Data-driven stellar parameters for southern TESS FGK targets
Henning, Th; Deacon, N. R.; Kossakowski, D. E.
We present stellar parameter estimates for 939 457 southern FGK stars that are candidate targets for the Transiting Exoplanet Survey Satellite (TESS) mission. Using a data-driven method similar to the CANNON, we build a model of stellar colours as a function of stellar parameters. We then use these in combination with stellar evolution models to e…
Structure of Our Galactic Bulge from CN Measurements
Lee, Jae-Woo
The double red clumps (DRCs) are now dominantly believed to be the strong observational line of evidence of the so-called X-shaped Galactic bar structures. Recently, Lee et al. reported a subtle mean δCN(3839) difference between the DRCs and suggested a dichotomic picture that can be seen in globular clusters: the faint red clump is the first gene…
Cosmic Ray Modulation with the Maximum CME Speed Index During Solar Cycles 23 and 24
Kilcik, Ali; Sarp, Volkan; Yurchyshyn, Vasyl +2 more
We analyzed modulation of cosmic-ray intensities (CRIs) during Solar Cycles 23 and 24 by using the international sunspot numbers (ISSN) and the maximum CME speed index (MCMESI) as proxies for solar activity. Temporal variations, cross-correlations, and hysteresis patterns of CRI, MCMESI, and ISSN data were investigated. As a result, we concluded t…