Photoelectric and electronographic photometry of the globular cluster NGC 1851

Details Photoelectric and electronographic photometry of the globular cluster NGC 1851 Photoelectric and electronographic photometry of the globular cluster NGC 1851

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.232..131s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 232, May 1, 1988, p. 131-145. Research supported by the

Astronomy and Astrophysics

Astronomy

7

Astronomical Photometry, Color-Magnitude Diagram, Electronography, Electrophotometry, Globular Clusters, Ubv Spectra, Astronomical Spectroscopy, Horizontal Branch Stars, Main Sequence Stars

Scientific paper

The colour-magnitude diagram for NGC 1851 is presented to a limit of V = 21.0 mag, approximately 2 mag below the main-sequence turn-off point, on the basis of UBV photoelectric photometry and electronographic BV photometry. The main-sequence turn-off parameters are (B-V)t = 0.40±0.03 mag; Vt = 19.45±0.1 mag. From the location of the horizontal branch stars, the apparent distance modulus to the cluster has been estimated as 15.45±0.2 mag. An age of 15±3 Gyr has been assigned to the cluster from the fitting of VandenBerg & Bell theoreticalisochrones.

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