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Galactic masers: Kinematics, spiral structure and the disk dynamic state
Dambis, A. K.; Bobylev, V. V.; Bajkova, A. T. +3 more
We applied the currently most comprehensive version of the statistical-parallax technique to derive the kinematical parameters of the maser sample with 136 sources. Our kinematic model comprises the overall rotation of the Galactic disk and the spiral density-wave effects, and the variation of radial velocity dispersion with Galactocentric distanc…
KDG218, a nearby ultra-diffuse galaxy
Sharina, M. E.; Karachentsev, I. D.; Makarova, L. N. +1 more
We present properties of the low-surface-brightness galaxy KDG218 observed with the HST/ACS. The galaxy has a half-light (effective) diameter of ae = 47″ and a central surface brightness of SBV(0) = 24.m4/□″. The galaxy remains unresolved with the HST/ACS, which implies its distance of D > 13.1 Mpc and linear ef…
IR photometry results and dust envelope model for symbiotic Mira star candidate V 335 Vul
Bogdanov, M. B.; Taranova, O. G.; Shenavrin, V. I.
We present the results of JHKLM-photometry for the symbiotic Mira star candidate V 335 Vul. Based on the average flux data, supplemented by IRAS, MSX, AKARI, and WISE mid-IR observations, we calculated a model of a spherically symmetric dust envelope of the star, made up of amorphous carbon and silicon carbide particles. The optical depth of the e…