Search Publications
The Clusters AgeS Experiment (CASE). Variable Stars in the Field of the Globular Cluster NGC 3201 - a Supplement
Thompson, I. B.; Rozyczka, M.; Pych, W. +1 more
We report the detection of 20 new variables in the field of NGC 3201. Among them there are 15 confirmed cluster members. Follow-up observations are desirable for two blue stragglers with variable light curves (probably resulting from magnetic activity), and for a yellow straggler coinciding with a Chandra X-ray source. Two of the eclipsing binarie…
Absorption-line Abundances in the SMC-like Galaxy UGC 5282: Evidence of ISM Dilution from Inflows on Kiloparsec Scales
Bowen, David V.; Tripp, Todd M.; Jenkins, Edward B. +4 more
We present a Hubble Space Telescope Cosmic Origins Spectrograph spectrum of the QSO SDSS J095109.12+330745.8 ( ${z}_{\mathrm{em}}=0.645$ ) whose sightline passes through the SMC-like dwarf galaxy UGC 5282 ( ${M}_{B}=-16.0$ , cz = 1577 km s-1), 1.2 kpc in projection from the central H II region of the galaxy. Damped Lyα (DLA) absorption …
Study of Coronal Mass Ejections Succeeding the Associated X-Ray and γ-Ray Burst Solar Flares
Abdel-Sattar, Walid; Mawad, Ramy
This study is dedicated to the investigation of the characteristics of CMEs following the associated X-ray and γ-ray burst solar flares. Investigated 14786 CME events and 5092 Gamma Burst Monitor (GBM) solar flare events recorded during the solar period 2008–2017, found 503 (about 10%) CME events associated with GBM post-flare events (hereafter, G…
Evryscope-South Survey of Upper- and Pre-main Sequence Solar Neighborhood Stars
Law, Nicholas M.; Corbett, Hank; Gonzalez, Ramses +5 more
Using photometric data collected by Evryscope-South, we search for nearby young variable systems on the upper main sequence (UMS) and pre-main sequence (PMS). The Evryscopes are all-sky high-cadence telescope arrays operating in the Northern and Southern hemispheres. We base our search on a Gaia-selected catalog of young neighborhood upper- and pr…
A Binary Star in the Superbubble N160 in the Large Magellanic Cloud
Chu, You-Hua; Li, Chuan-Jui; Ishioka, Ryoko +2 more
We have made a spectroscopic investigation of the nature of 053949.17-693747.4, a blue star with mid-infrared excess, projected within a superbubble in the H II complex N160 in the Large Magellanic Cloud (LMC). Analyses of photometric and spectrophotometric data of this star indicate that it is an O7 ± 1 V in the LMC. The radial velocity of this s…
The fate of binary stars hosting planets upon interaction with Sgr A* black hole
Capuzzo-Dolcetta, R.; Davari, N.
Our Galaxy hosts a very massive object at its centre, often referred to as the supermassive black hole Sgr A*. Its gravitational tidal field is so intense that it can strip apart a binary star passing its vicinity and accelerate one of the components of the binary as hypervelocity star (HVS) and grab the other star as S-star. Taking into considera…
Global parameters of the W UMa stars FI Lyn, UV Lyn, and NSVS 781878
Popov, Velimir A.; Kjurkchieva, Diana P.; Marchev, Dragomir V. +1 more
Photometric and spectral observations of the W UMa binaries FI Lyn, UV Lyn, and NSVS 781878 with periods of around 9.5–10 hr were carried out in order to determine their global parameters by simultaneous light curve and radial velocity curve solutions. We found that the three targets have shallow‑contact configurations with close in mass and radiu…
Estimation of solar EUV flux from TIMED/GUVI data
Zhang, Yongliang; Paxton, Larry J.; Schaefer, Robert
This paper examines the relationships between the integrated solar EUV (26-34 nm and 5-45 nm) flux and the measured radiance in the N2 Lyman-Birge-Hopfield (LBH) 140-150 nm range (LBHS) under sunlit conditions. We find that both the (26-34 nm) and (5-45 nm) solar fluxes are linearly correlated with the daily median LBHS radiances with c…
Observations of the exoplanet transit for WASP-2
Gorbachev, M. A.; Shlyapnikov, A. A.; Ignatov, V. K.
We present observations of the exoplanet transit for the WASP-2 star carried out with the MTM-500 telescope at the Crimean Astrophysical Observatory of the Russian Academy of Sciences. A brief history of the discovery of the exoplanet WASP-2b is considered. The main characteristics are outlined. The observations and a processing procedure are desc…
Composite Spectra, Paper XXIII: HD 69479/80, a 90‑day binary with a cool‑giant primary
Griffin, R. Elizabeth; Griffin, Roger F.
HD 69479/80 is a composite‑spectrum binary whose components are a late‑G giant and an early‑A dwarf. The orbit has a period of only 91 days (which seems short for a system containing a cool giant with a radius of ∼13 solar radii), and a very small, but probably significantly non‑zero, eccentricity. We separated the component spectra by a procedure…