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Revista mexicana de astronomía y astrofísica

versão impressa ISSN 0185-1101


GROSSO, Mónica  e  LEVATO, Hugo. Spectral Morphology and Rotation in The Open Cluster NGC 6025. Rev. mex. astron. astrofis [online]. 2011, vol.47, n.2, pp.255-259. ISSN 0185-1101.

We have performed spectral classification and measurements of the axial rotation velocity for the brightest stars in the region of the open cluster NGC 6025. A distance modulus of 9.80 ± 0.06 (pe) and an age of 84 million years were derived. The brightest star of the cluster, HD 143448 was classified as B1Ve and it is a blue straggler as proposed by other authors (see Mermilliod 1982). We found three peculiar stars (two Si and one Hg-Mn?). Another star in the field shows emission but is probably a non-member. We also found two SB2 binaries. The average axial rotation for the cluster members seems to be 73% of the average rotation of the field stars with the same temperature.

Palavras-chave : Hertzsprung-Russell and C-M diagrams; open clusters and associations [individual (NGC 6025)]; stars [rotation].

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