Spectral morphology and rotation in the open cluster NGC 6025

Details Spectral morphology and rotation in the open cluster NGC 6025 Spectral morphology and rotation in the open cluster NGC 6025

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011rmxaa..47..255g&link_type=abstract

Revista Mexicana de Astronomía y Astrofísica Vol. 47, pp. 255-259 (2011)

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Hertzsprung-Russell And C-M Diagrams, Open Clusters And Associations: Individual (Ngc 6025), Stars: Rotation

Scientific paper

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.

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