Search Publications
Missions
Journals
Publication Years
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…
A photometric-spectroscopic study of the infrared-excess eclipsing binary V2364 Cyg
Jiang, Lin-Qiao; Dai, Hai-Feng; Wang, Shuang +2 more
The eclipsing binary V2364 Cyg is an A7V-type contact binary with a period of 0.5921 d. We present six spectra from LAMOST and BVRc light curves (LCs), which are simultaneously analyzed to obtain the absolute physical parameters. The first light maxima are brighter than the second ones by up to $\mathrm{0}_{.}^\mathrm{m}{038}$ , $\mathr…
The compound stream event of March 20-25, 2011 as measured by the STEREO B spacecraft
Morgan, Huw; Al-Shakarchi, Duraid A.
The interaction of interplanetary coronal mass ejections (ICME) with each other and with co-rotating interaction regions (CIR) changes their configuration, dynamics, magnetic field and plasma characteristics and can make space weather forecasting difficult. During the period of March 20–25, 2011, the Solar Terrestrial Relation Observatory (STEREO …
New astrometric positions of the Jovian irregular satellites Elara and Pasiphae in 2016-2018
Cheng, X.; Zhang, H. Y.; Yan, D. +5 more
A total of 372 astrometric positions of Jovian irregular satellites Elara and Pasiphae were obtained during three successive oppositions in 2016, 2017, and 2018, by 1 m telescope at Yunnan Observatory. Based on Gaia DR2 catalogue, 196 new positions of Elara and 176 new positions of Pasiphae were collected. We compared our observations to the theor…
The HD 217107 planetary system: Twenty years of radial velocity measurements
Kane, Stephen R.; Horner, Jonathan; Eastman, Jason D. +13 more
The hot Jupiter HD 217107 b was one of the first exoplanets detected using the radial velocity (RV) method, originally reported in the literature in 1999. Today, precise RV measurements of this system span more than 20 years, and there is clear evidence of a longer-period companion, HD 217107 c. Interestingly, both the short-period planet (Pb…
Astrometric errors introduced by interpixel capacitive coupling in hybridized arrays
Baum, Stefi; Ninkov, Zoran; Donlon, Kevan
Interpixel capacitance (IPC) between adjacent pixels in hybridized arrays gives rise to an electrostatic cross talk. This cross talk causes MTF degradation and blurring of images or spectra collected using these devices. As pixel size is driven down from the 18-µm pixel pitch of the H2RG read out circuits to the 10- or 15-µm H4RGs IPC …
The one that got away: a unique eclipse in the young brown dwarf Roque 12
Scholz, Aleks; Eislöffel, Jochen; Froebrich, Dirk +1 more
We report the discovery of a deep, singular eclipse of the bona fide brown dwarf Roque 12, a substellar member of the Pleiades. The eclipse was 0.65mag deep, lasted 1.3h, and was observed with two telescopes simultaneously in October 2002. No further eclipse was recorded, despite continuous monitoring with Kepler/K2 over 70d in 2015. There is tent…