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Effects of Binaries on Open Cluster Age Determination in Bayesian Inference
Chen, Jing; Zhang, Su; Li, Zhong-Mu +2 more
We investigate the effects of binaries on the cluster age determination for 561 open clusters in the Galactic disk via the Bayesian statistical framework. Stellar properties of these star clusters, including age, metallicity, distance modulus, color excess, binary fraction, and rotating star fraction, are derived from color-magnitude-diagrams (CMD…
Estimating accurate reddening values of LAMOST M dwarfs
Chen, B. -Q.; Yuan, H. -B.; Sun, W. -X. +3 more
M dwarfs are the dominating type of stars in the solar neighbourhood. They serve as excellent tracers for the study of the distribution and properties of the nearby interstellar dust. In this work, we aim to obtain high accuracy reddening values of M dwarf stars from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Data Relea…
Interacting planetary nebulae III: verification and galactic population based on the measurements of Gaia EDR3
Ali, A.; Mindil, A.; Mohery, M. +1 more
The phenomenon of interaction between planetary nebulae (PNe) and the interstellar medium (ISM) is one of the significant issues in the field of astrophysics. The main objective of this paper is to verify the interaction process for objects that have been known as interacting PNe (IPNe) in the literature. This study is based on parallax and proper…
Near-infrared Spectroscopy of the Nucleus of Low-activity Comet P/2016 BA14 during Its 2016 Close Approach
Kareta, Theodore; Harris, Walter M.; Reddy, Vishnu +1 more
The near-Earth comet P/2016 BA14 (PanSTARRS) is a slow-rotating, nearly dormant object, a likely dynamical twin of 252P/LINEAR, and was recently shown to have a mid-infrared spectrum very dissimilar to other comets. Comet BA14 was also recently selected as one of the backup targets for the ESA's Comet Interceptor, so a cleare…
The Hipparcos Pleiades Parallax Error is Also a Proper Motion Error
Makarov, V. V.
The mean parallax of the Pleiades open cluster from the Hipparcos catalog is larger than the true value by approximately 1 mas. The origin of this error, as well as a possible algorithm of correcting it, was proposed by Makarov (2002). The problem is reassessed using the more accurate Gaia data with a focus on the predicted correction to the Pleia…
Approach of the Hyades star cluster to the Solar system
Vereshchagin, S. V.; Sizova, M. D.; Emel'yanenko, V. V.
We present the results of calculations of the motion of the Hyades open cluster in the gravitational field of the Galaxy in the recent past. Our calculations show that the recent close passage of Hyades by the Solar system could cause a noticeable shift of the perihelion distances q of comets. The shift is negligible from q = 3 au to 2.6 au for th…
Invited review: Infrared spectroscopy of planetary atmospheres: Searching for insights into their past and present histories
Encrenaz, Thérèse
This article reflects my personal experience and illustrates some developments in the field of planetary spectroscopy, achieved within the Planetology Group of Paris Observatory over the past fifty years. Over these decades, planetary spectroscopy has led to the identification of minor atmospheric species with mixing ratios as low as a few parts p…
Nonlinear Wave and Plasma Structures in the Auroral and Subauroral Geospace
Mishin, Evgeny V.; Streltsov, Anatoly V.
Astrometric observations and analysis of Triton during 2013-2019
Zhang, H. Y.; Yan, D.; Qiao, R. C. +2 more
Triton is the largest irregular satellite of Neptune. A total of 1135 new observed positions of Triton in the period 2013-2019 were collected by the 1.0 m telescopes at Yunnan Astronomical Observatory of CAS during 13 nights. These positions of Triton were obtained based on Gaia DR2 catalogue. We compared our observations to the theoretical positi…
Observations of Current Sheet Heating in X-Ray during a Solar Flare
Reva, A. A.; Kirichenko, A. S.; Ulyanov, A. S. +2 more
In the solar corona, magnetic reconnection occurs due to the finite resistivity of the plasma. At the same time, this resistivity leads to ohmic heating. Therefore, the reconnecting current sheet should heat the surrounding plasma. This paper presents experimental evidence of such plasma heating being caused by magnetic reconnection. We observed t…