Abstract
view Abstract Citations (37) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The color-magnitude diagram for the globular cluster NGC 5897. Sandage, A. ; Katem, B. Abstract The color-magnitude diagram of NGC 5897, derived from two-color photometry of 254 stars relative to a photoelectric sequence extending to V 17.15, is characteristic of a globular cluster with low metal abundance. The magnitude difference, iW, between the giant branch at (B - V)0 = +1.4 and the horizontal branch is 2.75 mag; the color of the subgiant branch at the magnitude level of the RR Lyrae gap is (B - V)0 ,g = +0.78-values which suggest a metal abundance intermediate between extremely weak-lined clusters (Deutsch group C, Morgan class I) and moderately weak-lined clusters (Deutsch group B, Morgan classes 11-111) Two new RR Lyrae stars and a new red variable near the top of the giant branch have been isolated, bringing the total number of known variables to seven. The RR Lyrae gap occurs near V = 16.20. The apparent visual distance modulus is (m - = 15.70 if the gap has M~ = +0.5. The estimated reddening is E(B - V) = +0 11 ± 0.02. If A vi E(B - V) = 3, the true modulus is (m - M)0 = 15.37, the distance from the Sun is 11900 pc, and the height above the plane is 6000 Pc. The absolute magnitude and linear diameter are M~ = - 7.3, D = 54 pc, which require the average surface brightness to be 14 times smaller than that for M3. The low central concentration and large linear size are taken to mean that NGC 5897 has not suffered appreciable tidal evaporation by passage close to the galactic nucleus Publication: The Astrophysical Journal Pub Date: August 1968 DOI: 10.1086/149687 Bibcode: 1968ApJ...153..569S full text sources ADS | data products SIMBAD (133) GCPD (1)
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