The metal-poor globular cluster NGC 6656

Details The metal-poor globular cluster NGC 6656 The metal-poor globular cluster NGC 6656

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26as...29..383a&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 29, Sept. 1977, p. 383-395. Research supported by the Ministerio de Educacio

Astronomy and Astrophysics

Astrophysics

33

Astronomical Photography, Globular Clusters, Metals, Ubv Spectra, Electrophotometry, Interstellar Extinction, Stellar Magnitude

Scientific paper

Color-magnitude (CM) diagrams for the nearby southern globular cluster NGC 6656 are derived from photographic measurements of 374 stars calibrated against a UBV photoelectric sequence of 16 stars with V magnitudes of 8.61 to 16.18. The main features of a composite CM diagram for three rings of stars are shown to be typical of metal-poorness and to include a rather steep well-defined giant branch, a large sample of blue horizontal-branch stars with (B-V) colors of 0.15 to 0.45 magnitude, and a lack of red horizontal-branch stars. The periods of two long-period red giants and one RR Lyrae variable are measured, a true distance modulus of 12.67 magnitudes (equivalent to a distance of 3.42 kpc) is determined, and the cluster is estimated to be 0.45 kpc from the galactic plane and 5.73 kpc from the galactic center. Metallicity parameters are obtained which confirm the cluster's low metallicity.

Affiliated with

Also associated with

No associations

Rating

The metal-poor globular cluster NGC 6656 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The metal-poor globular cluster NGC 6656, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The metal-poor globular cluster NGC 6656 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1092542