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Rotation of open clusters based on Gaia data. Praesepe
Popov, Alexander A.; Loktin, Alexander V.
High–precision trigonometric parallaxes, proper motions, and radial velocities of the Gaia DR2 catalog allow us to investigate the problem of open clusters rotation. Such a study could naturally be started with the clusters closest to the Sun, so we chose Praesepe as an object of our study. We selected 908 probable cluster members up to the appare…
Extending Gaia DR2 with HST narrow-field astrometry - II. Refining the method on WISE J163940.83-684738.6
Bedin, L. R.; Fontanive, C.
In the second paper of this series, we perfected our method of linking high-precision Hubble Space Telescope astrometry to the high-accuracy Gaia DR2 absolute reference system to overcome the limitations of relative astrometry with narrow-field cameras. Our test case here is the Y brown dwarf WISE J163940.83-684738.6, observed at different epochs …
Visual Orbits of Spectroscopic Binaries with the CHARA Array. III. HD 8374 and HD 24546
Gies, Douglas R.; Lester, Kathryn V.; Monnier, John D. +9 more
We present the visual orbits of two long-period spectroscopic binary stars, HD 8374 and HD 24546, using interferometric observations acquired with the CHARA Array and the Palomar Testbed Interferometer. We also obtained new radial velocities from echelle spectra using the APO 3.5 m and Fairborn 2.0 m telescopes. By combining the visual and spectro…
Secular changes in the orbits of the quadruple system VW LMi
Kundra, E.; Budaj, J.; Szabó, Gy M. +8 more
VW LMi is the tightest known quadruple system with 2 + 2 hierarchy. It consists of a W UMa-type eclipsing binary (P12 = 0.477 55 d) and another detached non-eclipsing binary (P34 = 7.93 d) orbiting around a common centre of mass in about P1234 = 355 d. We present new observations of the system extending the time ba…
HST UV Observations of Asteroid (16) Psyche
Roth, Lorenz; Feaga, Lori M.; Becker, Tracy M. +7 more
The Main Belt Asteroid (16) Psyche is the target object of the NASA Discovery Mission Psyche. We observed the asteroid at ultraviolet (UV) wavelengths (170-310 nm) using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope during two separate observations. We report that the spectrum is very red in the UV, with a blue upturn shor…
Extraplanar Gas in Edge-on Galaxies Traced by SOFIA Observations of [C II]
Reach, William T.; Fadda, Dario; Stacey, Gordon J. +1 more
Bursts of localized star formation in galaxies can levitate material from the midplane. Spiral galaxies that are edge-on allow a clear distinction of material that is levitated off the galaxies' midplanes. We used SOFIA to measure the vertical distribution of [C II] 157.7 µm line emission for two nearby, edge-on galaxies, NGC 891 and NGC 590…
Cause and Kinematics of a Jetlike CME
Wang, Yuming; Joshi, Reetika; Chandra, Ramesh +3 more
In this article, we present the multiviewpoint and multiwavelength analysis of an atypical solar jet based on data from Solar Dynamics Observatory, SOlar and Heliospheric Observatory, and Solar TErrestrial RElations Observatory. It is generally believed that coronal mass ejections (CMEs) develop from the large-scale solar eruptions in the lower at…
The cooling-down central star of the planetary nebula SwSt 1: a late thermal pulse in a massive post-AGB star?
Hamann, Wolf-Rainer; Todt, Helge; Zijlstra, Albert A. +3 more
SwSt 1 (PN G001.5-06.7) is a bright and compact planetary nebula containing a late [WC]-type central star. Previous studies suggested that the nebular and stellar lines are slowly changing with time. We studied new and archival optical and ultraviolet spectra of the object. The [O III] 4959 and 5007 Å to H β line flux ratios decreased between abou…
Equilibrium axisymmetric halo model for the Milky Way and its implications for direct and indirect dark matter searches
Petač, Mihael
We for the first time provide self-consistent axisymmetric phase-space distribution models for the Milky Way's dark matter (DM) halo which are carefully matched against the latest kinematic measurements through Bayesian analysis. By using broad priors on the individual galactic components, we derive conservative estimates for the astrophysical fac…
The efficiency of nuclear burning during thermonuclear (Type I) bursts as a function of accretion rate
Cavecchi, Y.; Galloway, D. K.; Heger, A. +2 more
We measured the thermonuclear burning efficiency as a function of accretion rate for the Type I X-ray bursts of five low-mass X-ray binary systems. We chose sources with measured neutron star spins and a substantial population of bursts from a large observational sample. The general trend for the burst rate is qualitatively the same for all source…