A Sequence of Photoelectric Standard Stars Surrounding NGC 6397

Astronomy and Astrophysics – Astronomy

Scientific paper

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Photometry, Clusters: Globular

Scientific paper

UBV photometry is presented for 26 standard stars surrounding the globular cluster NGC 6397. The measurements of these stars, which have 9.1 < V < 16.8, were obtained at Cerro Tololo during five observing runs between 1975 and 1978. A value EB-V = 0.19±0.02 is derived from the observations of three standards that are cluster blue horizontal-branch stars.

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