Peculiar stars in the Ursa Major stream

Details Peculiar stars in the Ursa Major stream Peculiar stars in the Ursa Major stream

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984azh....61..136k&link_type=abstract

(Astronomicheskii Zhurnal, vol. 61, Jan.-Feb. 1984, p. 136-142) Soviet Astronomy (ISSN 0038-5301), vol. 28, Jan.-Feb. 1984, p. 8

Astronomy and Astrophysics

Astronomy

5

A Stars, Peculiar Stars, Star Clusters, Stellar Composition, Stellar Rotation, Color-Magnitude Diagram, High Dispersion Spectrographs, Metallicity, Stellar Atmospheres, Stellar Evolution, Stellar Spectra, Stellar Temperature, Ubv Spectra

Scientific paper

Quantitative determinations of the type and degree of peculiarity of nine Ap stars in the Ursa Major stream are made from high-resolution (9 A/mm) spectrograms. The rotational velocities v sin i are measured from the half-widths of the Mg II 4481 A line. By comparing the observed parameters of the hydrogen spectra of the stars and the parameters calculated from Kurucz's models, T(eff) and log g are determined. From data of UBV and ubvy, beta photometry for stars of the stream, a Mv, (B-V) color-magnitude diagram is constructed, with the help of which the ages of the stream stars are estimated: t = (4-5) x 10 to the 8th yr.

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