Open AccessSPECTROSCOPIC INVESTIGATIONS OF GALACTIC OPEN CLUSTER COLLINDER 394 – NEW RESULTS
Author(s) -
И. А. Усенко,
A. Y. Kniazev,
А. С. Мирошниченко,
S. Danford,
V. V. Kovtyukh,
T. V. Mishenina
Publication year - 2021
Publication title -
odessa astronomical publications
Language(s) - English
Resource type - Journals
eISSN - 2786-5215
pISSN - 1810-4215
DOI - 10.18524/1810-4215.2021.34.244381
Subject(s) - physics , stars , astrophysics , open cluster , photometry (optics) , correctness , radius , astronomy , computer science , algorithm , computer security
Confident main-sequence (MS) members of the Collinder 394 open cluster are perfect objects to check the correctness of their distances, obtained from the GAIA GR2 (2018) catalogue. The differences in the distances to the open cluster Collinder 394, determined by photometry and from the GAIA parallaxes have raised doubts about the correctness of the latter. Therefore we used spectroscopically determined T eff and loggvalues for these stars from Usenko et al. (2019) and tried to solve the inverse problem: determine radii of these stars using the derived distances and calibrations “T eff - radius” for MS stars and compare with similar ones. For this purpose we used the calibrations from Torres et al. (2010), based on the nearest MS eclipsing binaries and compilations for MS stars from Mamajek (2018). As a result, we obtained relationships that connect T eff , logg, radii, masses, and distances for the confident Collinder 394 MS stars. We have confirmed the correctness of the GAIA DR2 (2018) distances for these stars and determined their radii and masses. The latter estimates turned out to be close to those of the evolutionary masses calculated by the PARSEC model