Metal-rich globular clusters in the galaxy. IV. A color-magnitude diagram for NGC 6304

Journal Article · Thu Jan 01 04:00:00 EST 1976 · Astrophys. J., v. 203, no. 1, pp. 113-123

DOI:https://doi.org/10.1086/154053· OSTI ID:4033209

Hesser, J E; Hartwick, F D.A.

From a study to V=19.1 and B=20.8 mag in the UBV system of approx.385 stars near the G2 globular cluster NGC 6304, a color-magnitude diagram has been found whose characteristics appear similar to those of 47 Tucanae, supporting the conclusion that NGC 6304 is a moderately metal-rich cluster. The reddening, E (B- -V), has been estimated to be 0.58+-0.005 mag, and the distance modulus is found, assuming M/subV/,=+0.9+-0.2 mag, to be (m-M)$sub 0$=13.4+-0.2 mag. The cluster is thus 4.8 kpc from the sun and 450 pc above the galactic plane, and it has an absolute visual magnitude of -6.8. Cluster membership of the numerous variable stars in this field remains uncertain, although one red and two possible RR Lyrae variables may be cluster members. (AIP)

• Research Organization: Cerro Tololo Inter-American Observatory
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-030575
• OSTI ID: 4033209
• Journal Information: Astrophys. J., v. 203, no. 1, pp. 113-123, Journal Name: Astrophys. J., v. 203, no. 1, pp. 113-123; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

*STAR CLUSTERS-- PHOTOMETRY
640102* --Physics Research--Astrophysics & Cosmology--Stars
BRIGHTNESS
CHEMICAL COMPOSITION
COLOR
DISTANCE
METALS
MILKY WAY
N56200* --Physics (Astrophysics & Cosmology)--Stars
VARIABLE STARS