Search Publications
Objects of the Catalog of Orbits of Visual Binary Stars in Gaia DR2
Chulkov, D. A.
Cross-identification is made for the Catalog of Orbits of Visual Binary Stars and Gaia DR2. At least one component has been matched for 88% systems, for 15% identification is available for both stars. Systems with substantially different parallaxes of components are found, which are the candidates to be the optical pairs. It's shown that published…
ExoMars Flush Air Data System: Experimental and Numerical Investigation
Schleutker, Thorn; Gülhan, Ali; Hove, Bart Van +1 more
Variability in high‑mass X‑ray binaries
Wilms, J.; Pottschmidt, K.; Grinberg, V. +5 more
Strongly magnetized, accreting neutron stars show periodic and aperiodic variability over a wide range of time scales. By obtaining spectral and timing information on these different time scales, we can have a closer look into the physics of accretion close to the neutron star and the properties of the accreted material. One of the most prominent …
Search for Evolutionary Changes in the Periods of Cepheids: V532 Cyg
Berdnikov, L. N.
For the low-amplitude Cepheid V532 Cyg we have constructed an O - C diagram spanning a time interval of 121 years. The O - C diagram has the shape of a parabola, which has made it possible to determine for the first time the quadratic light elements and to calculate the rate of evolutionary decrease in the period, dP/dt = -0.248 (±0.067) s yr…
Comparison of proper motions in declination for 387 Gaia DR2 and HIPPARCOS stars from ILS observations over many decades
Taris, F.; Damljanović, G.
Context. The second solution of the Gaia catalog, which has been available since April 2018, plays an important role in the realization of the future Gaia reference frame. Since 1997, the reference frame has been materialized by the optical HIPPARCOS positions of about 120 000 stars. The HIPPARCOS has been compared with and linked to the Internati…
Near- to mid-infrared spectroscopy of the heavily obscured AGN LEDA 1712304 with AKARI/IRC
Oyabu, S.; Toba, Y.; Kaneda, H. +5 more
Context. Although heavily obscured active galactic nuclei (AGNs) have been found by many observational studies, the properties of the surrounding dust are poorly understood. Using AKARI/IRC spectroscopy, we discovered a new heavily obscured AGN in LEDA 1712304 which shows a deep spectral absorption feature due to silicate dust.
Aims: We study…
A Photometric Study of the Contact Binary V384 Serpentis
Michaels, E. J.; Lanning, C. M.; Self, S. N.
In this paper we present the first photometric light curves in the Sloan g', r', and i' passbands for the contact binary V384 Ser. Photometric solutions were obtained using the Wilson-Devinney program which revealed the star to be a W-type system with a mass ratio of q = 2.65 and a f = 36% degree of contact. The less massive component was found to…
An XMM-Newton look at the strongly variable radio-weak BL Lac Fermi J1544-0639
Pian, E.; Masetti, N.; Ubertini, P. +6 more
Context. Fermi J1544-0639/ASASSN-17gs/AT2017egv was identified as a gamma-ray/optical transient on May 15, 2017. Subsequent multiwavelength observations suggest that this source may belong to the new class of radio-weak BL Lacs.
Aims: We studied the X-ray spectral properties and short-term variability of Fermi J1544-0639 to constrain the X-ra…
Generalized Additive Modeling Combined With Multiple Collinear for ICME Velocity Forecasting
Ji, H. S.; Wang, M.; Lu, J. Y. +5 more
One of the main issues of space weather is the timely prediction of disturbed solar wind parameters at L1, especially caused by Coronal Mass Ejection (CME). Using the data from 170 front halo, flare-associated CMEs, and in-site solar wind data, an analysis of the Interplanetary Coronal Mass Ejection (ICME) peak velocity at L1 related to associated…
Ultraviolet HST Spectroscopy of Planck Cold Clumps
Meyer, David M.; Dirks, Cody
We report results of the first study utilizing the ultraviolet capabilities of the Hubble Space Telescope to investigate a sample of Planck Galactic Cold Clump (PGCC) sources. We have selected high-resolution spectra toward 25 stars that contain a multitude of interstellar absorption lines associated with the interstellar medium (ISM) gas within t…