Photoelectric UBV and DDO Photometry of NGC5138

Details Photoelectric UBV and DDO Photometry of NGC5138 Photoelectric UBV and DDO Photometry of NGC5138

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..72..347c&link_type=abstract

Astrophysics and Space Science, Volume 72, Issue 2, pp.347-357

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

Results ofUBV photoelectric photometry in NGC 5138 are presented for 50 stars brighter than 14.0 mag. In addition, four probable red giants were also observed in the DDO system. Sixteen stars previously considered members by Lindoff (1972), were found not to be physically connected with the cluster. NGC 5138 is located 1.80 kpc from the Sun and the visual interstellar absorption determined from the reddenedB stars amounts toA v =0.75 mag. Three of the four red stars observed in the DDO system were found to be cluster members. The mean cyanogen anomaly is <δCN>=0.043±0.018 (m.e.), which implies that NGC 5138 is richer in CN than the field K giants in the solar neighbourhood, but poorer than the Hyades giants. The cluster age is estimated to be ˜1.5×108 yr.

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