DDO photometry of giants in the open cluster IC 4651

Details DDO photometry of giants in the open cluster IC 4651 DDO photometry of giants in the open cluster IC 4651

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87..360s&link_type=abstract

Astronomical Journal, vol. 87, Feb. 1982, p. 360-368.

Other

26

Giant Stars, Heavy Elements, Interstellar Extinction, Open Clusters, Stellar Evolution, Stellar Spectra, Stellar Spectrophotometry, Abundance, Cyanogen, Metallic Stars, Spectrum Analysis, Star Distribution, Ubv Spectra

Scientific paper

DDO photometry has been obtained for 14 stars in the open cluster IC 4651. The reddening and distance modulus derived from these data are in good agreement with the results obtained from UBV photometry by Eggen. The cluster appears to have a heavy-element abundance slightly less than that of the Hyades, although one giant shows an anomalously strong 4216-A CN band comparable to those seen in the SMR giants. A comparison is made between this star and CN-enhanced giants in eight other open clusters. It is suggested that the CN-strong phenomenon among open cluster giants is the result of nonstandard stellar evolution, the occurrence of which is supported by the presence of blue stragglers in five out of the eight comparison clusters, as well as in IC 4651 itself.

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