108 research outputs found
Bis[hexaÂamminecobalt(III)] pentaÂchloride nitrate
The title compound, [Co(NH3)6]2Cl5(NO3), was obtained under hydroÂthermal conditions. The asymmetric unit contains three Co3+ ions, one lying on an inversion center and the other two located at 2/m positions. All Co3+ ions are six-coordinated by NH3 molÂecules, forming [Co(NH3)6]3+ octahedra, with Co—N distances in the range 1.945 (4)–1.967 (3) Å. The nitrate N atom and one of the O atoms lie at a mirror plane. Among the Cl− anions, one lies in a general position, one on a twofold axis and two on a mirror plane. N—H⋯O and N—H⋯Cl hydrogen bonds link the cations and anions into a three-dimensional network
A catalogue and statistical analysis for magnetic stars
Magnetic fields are significant in the structure and evolution of stars. We
present a comprehensive catalogue of 1784 known magnetic stars, detailing their
identifications, HD numbers, precise locations, spectral types, and averaged
quadratic effective magnetic fields among other important information. The
group comprises 177 O-type stars, 551 B-type stars, 520 A-type stars, 91 F-type
stars, 53 G-type stars, 61 K-type stars, 31 M-type stars, and an additional 300
stars whose spectral classification remains indeterminate. Our analysis
examines the statistical properties of these magnetic stars. The relative
integrated distribution function and number distribution function for all
magnetic stars of the same spectral type can be effectively approximated using
an exponential function of the averaged quadratic effective magnetic field. The
analysis further reveals that A and B-type stars possess the strongest mean
magnetic fields, indicating an easier detection of their magnetic fields.Comment: 36 pages, 11 figures, accepted 2023 July 11 by RA
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