Search Publications
Missions
Journals
Publication Years
Current sheets in planetary magnetospheres
Delcourt, Dominique; Zelenyi, Lev; Malova, Helmi +2 more
In this article we aim to highlight the problems related to the structure and stability of the comparatively thin current sheets that were relatively recently discovered by space missions in the magnetospheres of the Earth and planets, as well as in the solar wind. These magnetoplasma structures are universal in collisionless cosmic plasmas and ca…
Asymmetric Mean Metallicity Distribution of the Milky Way’s Disk
An, Deokkeun
I present the mean metallicity distribution of stars in the Milky Way based on photometry from the Sloan Digital Sky Survey. I utilize an empirically calibrated set of stellar isochrones developed in previous work to estimate the metallicities of individual stars to a precision of 0.2 dex for reasonably bright stars across the survey area. I also …
Formation of Transition Alumina Dust around Asymptotic Giant Branch Stars: Condensation Experiments using Induction Thermal Plasma Systems
Tsuchiyama, Akira; Takigawa, Aki; Kim, Tae-Hee +5 more
Mid-infrared spectroscopic observations of oxygen-rich asymptotic giant branch (AGB) stars show the common presence of dust species that have a broad feature at ∼11-12 µm. Chemically synthesized amorphous alumina (Al2O3) is widely accepted as the source of this emission, although it is not obvious that amorphous alumina…
CPD-64°2731: a massive spun-up and rejuvenated high-velocity runaway star
Katkov, I. Y.; Gvaramadze, V. V.; Castro, N. +4 more
We report the results of our study of the high-velocity ({≈ }160 km s^{-1}) runaway O star CPD-64°2731 and its associated horseshoe-shaped nebula discovered with the Wide-field Infrared Survey Explorer. Spectroscopic observations with the Southern African Large Telescope and spectral analysis indicate that CPD-64°2731 is a fast-rotating main-seque…
A survey for high-mass eclipsing binaries
Chini, R.; Hackstein, M.; Pozo Nuñez, F. +4 more
We report results from a search for Galactic high-mass eclipsing binaries. The photometric monitoring campaign was performed in Sloan r and i with the robotic twin refractor RoBoTT at the Universitätssternwarte Bochum in Chile and complemented by Johnson UBV data. Comparison with the SIMBAD data base reveals 260 variable high-mass stars. Based on …
The MAGIC project - II. Discovery of two new Galactic lithium-rich Cepheids
Kovtyukh, V.; Lemasle, B.; Kniazev, A. +6 more
We report the discovery of two new lithium-rich Cepheids in the Milky Way (A(Li) ≈ 2.9 dex) among the targets of the MAGIC spectroscopic survey with the Southern African Large Telescope spectrographs. The 6707 Å Li feature is usually not detectable in the atmosphere of Cepheids. Only three Cepheids (two in the Milky Way and one in the Large Magell…
A MUSE study of the inner bulge globular cluster Terzan 9: a fossil record in the Galaxy
Bica, E.; Barbuy, B.; Kamann, S. +5 more
Context. Moderately metal-poor inner bulge globular clusters are relics of a generation of long-lived stars that formed in the early Galaxy. Terzan 9, projected at 4°.12 from the Galactic center, is among the most central globular clusters in the Milky Way, showing an orbit which remains confined to the inner 1 kpc.
Aims…
The Mass Dependence of Structure, Star Formation Rate, and Mass Assembly Mode at 0.5 < z < 2.5
Fang, Guanwen; Kong, Xu; Gu, Yizhou +5 more
To investigate the mass dependence of structural transformation and star formation quenching, we construct three galaxy samples using massive (M * > 1010 M ⊙) red, green, and blue galaxy populations at 0.5 < z < 2.5 in five 3D-HST/CANDELS fields. The structural parameters, including effective radius (r
Resolving the distance controversy for Sharpless 269. A possible kink in the outer arm
Immer, K.; Reid, M. J.; Quiroga-Nuñez, L. H. +2 more
Context. Sharpless 269 (S 269) is one of a few HII regions in the outer spiral arm of the Milky Way with strong water maser emission. Based on data from the Very Long Baseline Interferometry (VLBI) Exploration of Radio Astrometry (VERA) array, two parallax measurements have been published, which differ by nearly 2σ. Each distance estimate supports…
Evolution of the Extended X-Ray Emission from the PSR B1259-63/LS 2883 Binary in the 2014-2017 Binary Cycle
Kargaltsev, Oleg; Hare, Jeremy; Pavlov, George +1 more
We have performed a series of Chandra X-ray Observatory observations of the gamma-ray binary LS 2883, which is composed of a young pulsar (PSR B1259-63) orbiting a massive Be star with a period of 1236.7 days. The system was observed in five epochs, spanning a range from 352 to 1175 days after the periastron passage on 2014 May 4. The observations…