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Spectroscopy of Supergiants with Infrared Excess: Results of 1998–2018
Klochkova, V. G.
We shortly summarize here the results of the second stage (1998–2018) of the detailed spectroscopy program of peculiar supergiants identified with galactic infrared sources, performed at the 6-m BTA telescope. The main aspect of the program is a search for the evolutionary variations in the chemical composition of stars, past the AGB stage and the…
The Nature of Class I Sources: Periodic Variables in Orion
Duchene, Gaspard; Ellithorpe, Elizabeth A.; Stahler, Steven W.
We present a quantitative, empirically based argument that at least some Class I sources are low-mass, pre-main-sequence stars surrounded by spatially extended envelopes of dusty gas. The source luminosity arises principally from stellar gravitational contraction, as in optically visible pre-main-sequence stars that lack such envelopes. We base ou…
Prospect for UV observations from the Moon. III. Assembly and ground calibration of Lunar Ultraviolet Cosmic Imager (LUCI)
Brosch, Noah; Mathew, Joice; Sreejith, A. G. +14 more
The Lunar Ultraviolet Cosmic Imager (LUCI) is a near-ultraviolet (NUV) telescope with all-spherical mirrors, designed and built to fly as a scientific payload on a lunar mission with Team Indus—the original Indian entry to the Google Lunar X-Prize. Observations from the Moon provide a unique opportunity of a stable platform with an unobstructed vi…
Comparative Study of Microwave Polar Brightening, Coronal Holes, and Solar Wind over the Solar Poles
Masuda, Satoshi; Yashiro, Seiji; Shibasaki, Kiyoto +3 more
We compared the long-term variation (1992 - 2017) in solar polar brightening observed with the Nobeyama Radioheliograph, the polar solar-wind velocity with interplanetary scintillation observations at the Institute for Space-Earth Environmental Research, and the coronal-hole distribution computed by potential-field calculations of the solar corona…
The influence of Ceres on the dynamical evolution of the Zdenekhorsky/Nemesis asteroid family
Carruba, V.; Barletta, W.
The Nemesis family, also identified as the Zdenekhorsky family by some authors, is an "incomplete" asteroid family in the central main belt, characterized by an asymmetric distribution between its left and right side, with most of its members located in the left part of the family. It has been suggested that this asymmetry, as well as the shape of…
Membership and fundamental parameters of the intermediate-age open clusters NGC 2281 and NGC 2539 based on Gaia-DR2
Gao, Xin-Hua
This paper presents an investigation on the two intermediate-age open clusters NGC 2281 and NGC 2539 based on Gaia Data Release 2 (Gaia-DR2). A combined machine-learning method is used to identify likely cluster members of the two clusters, taking into account the astrometric and photometric data of Gaia-DR2. It is found that NGC 2281 and NGC 2539…
A catalogue of 108 extended planetary nebulae observed by GALEX
Pradhan, Ananta C.; Panda, Swayamtrupta; Ojha, Devendra K. +2 more
We present the ultraviolet (UV) imaging observation of planetary nebulae (PNe) using archival data of Galaxy Evolution Explorer (GALEX). We found 358 PNe detected by GALEX in near-UV (NUV). We have compiled a catalogue of 108 extended PNe with sizes greater than
Dust-ion-acoustic modes at comet 67P/Churyumov-Gerasimenko
Chen, Hui; Yang, Weiheng; Liu, Sanqiu
The dynamics of dust-ion-acoustic (DIA) modes at Comet 67P/Churyumov-Gerasimenko, where H2O+ ions with warm and cold electrons as well as dust grains were detected, are investigated within the two-electron-temperature dusty plasmas model by the kinetic theory. In terms of current-driven DIA waves, the bulk electron drift is a…
Hunting Young White Dwarfs at the Center of Planetary Nebulae
Weidmann, Walter A.; Ahumada, Javier A.; Miller Bertolami, Marcelo M. +1 more
We present Gemini-South observations of nine faint and extended planetary nebulae (PNe). Using direct images taken with the spectrograph Gemini-South multi-object spectrograph (GMOS), we built the (u\prime -g\prime ) versus (g\prime -r\prime ) diagrams of the stars in the observed areas which allowed us …
Galactic archaeology with Gaia
Wyse, Rosemary
The past and present merger activity of the Milky Way galaxy has recently been put into sharp focus through the analysis of data from the Gaia astrometric satellite. These data were released by the European Space Agency in 2016 (DR1) and 2018 (DR2). The emerging picture created is one of persistent disequilibrium, with high merger activity some 10…