Search Publications
Missions
Journals
Publication Years
Independent Analysis of µδ Data of ILS and INDLS Catalogs to Obtain the Spin of the Bright Gaia DR2 Reference Frame
Aleksić, J.; Damljanović, G.; Stojanović, M.
The Gaia DR2 reference frame should be without relative rotation to the quasars (QSOs) and consistent with the International Celestial Reference System (ICRS). For the faint part of DR2 (stars with Gaia magnitude G≥16) that task was done via Gaia's observations of QSOs (G≥17 mag), but the bright DR2 (G≤13 mag) is difficult to validate and it rotat…
Constraints on Sub-Neptune Planet Candidate KOI-972.01 via Joint Variability/Gravity-darkening Analysis
Barnes, Jason W.; Myers, Samuel A.; Ahlers, John P.
We analyze Kepler photometry of transiting planet candidate KOI-972.01, accounting for both stellar variability and gravity darkening. KOI-972.01 stands out because of its small radius, less than that of Neptune, and because of its intermediate orbit period at 13.12 days, long enough to avoid significant tidal evolution, and thus it represents an …
Improving the Orbits of Four Visual Binaries Using Gaia DR2 Data and Observations with the 26-inch Refractor of Pulkovo Observatory
Romanenko, L. G.; Izmailov, I. S.
We use a modified method of the apparent motion parameters (AMP), in which the initial data from the Gaia DR2 catalog are not only high-precision coordinates, parallaxes, and radial velocities of the components of the studied wide binary stars, but are also their proper motions. The coincidence of the AMP orbits obtained both from the Gaia DR2 dat…
Oxygen-Rich Cool Stars in the Cepheus Region. New Spectroscopic Observations of Selected Objects from the KP2001 Catalog
Gigoyan, K. S.; Kostandyan, G. R.; Petrosyan, G. V. +1 more
Spectra taken with the 2.6-m telescope at the Byurakan Astrophysical Observatory (BAO) in the λλ4000-7250Å range for eight M giants from the KP2001 catalog confirm their oxygen-rich nature. The features of these spectra are examined. Several important physical parameters from the EDR3 Gaia data base are presented. The optical variability is studie…
Precise Orbit Determination of MEX Flyby Phobos Using Simulated Radiometric and Image Data
Yan, Jianguo; Gao, Wutong; Zhu, Xinbo +3 more
Turning Instrument Background Into Science Data for Structural Features of Radiation Belts
Dandouras, I.; Rème, H.; Liemohn, M. W. +2 more
Approaches regarding how to turn the instrument background counts into scientifically valuable data are presented in this Technical Report on Methods. The background counts due to penetrating energetic particles of radiation belts detected on Cluster CIS HIA and CODIF instruments and the Double Star HIA instrument are used in these approaches. In …
Spectral energy distribution similarity of the local galaxies and the 3.6 µm selected galaxies from the Spitzer Extended Deep Survey
Cheng, Cheng; Li, Zi-Jian; Huang, Jia-Sheng +11 more
The Spitzer Extended Deep Survey (SEDS) as a deep and wide mid-infrared (MIR) survey project provides a sample of 500 000+ sources spreading 1.46 square degree and a depth of 26 AB mag (3σ). Combining with the previous available data, we build a PSF-matched multi-wavelength photometry catalog from u band to 8 µm. We fit the SEDS galaxies spe…
Properties of the recently discovered Eclipsing Binary GSC 03421-01402
Lloyd, Ch.; Screech, J.
GSC 03421-01402 is a low-amplitude eclipsing binary with a period of 7.6800475(44) d. The eclipsing binary is one component of a close pair identified in the Gaia EDR3 data with delta G = 0.45 mag. The light-curve suggests that the primary eclipse is total with an observed depth of 0.13 mag, but due to dilution the true depth could be approximatel…
The Plasmasphere: Its Interactions and Dynamics
Darrouzet, Fabien; Gallagher, Dennis L.; De Keyser, Johan
Magnetic activity and age estimation of red giants using neural networks
Lu, Hong-peng; Zhang, Li-yun; Karoff, Christoffer
In this work, we analysed the magnetic activity of 5349 Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low-dispersion spectra of 3539 red giants by calculating equivalent width (EW) of magnetic activity lines (H α, H β, H γ, H δ, $\rm{Ca~{ii} H\&K}$, $\rm{Ca~{ii} IRT}$). Combining LAMOST spectral parameters, asteroseismic p…