NGC 6397: a case study in the resolution of post-collapse globular cluster cores | Zendy

G. A. Drukier | Zendy

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NGC 6397: a case study in the resolution of post-collapse globular cluster cores

Author(s) -

G. A. Drukier

Publication year - 1993

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/265.3.773

Subject(s) - globular cluster , physics , astrophysics , surface brightness , radius , brightness , star cluster , cluster (spacecraft) , astronomy , core (optical fiber) , stars , galaxy , optics , computer security , computer science , programming language

Model surface brightness profiles based on Fokker-Planck simulations havebeen used to assess the high resolution surface brightness profile of theglobular cluster NGC 6397 of Lauzeral et al. (1992). The profile is well fittedby the model in the maximum-expansion phase of a gravothermal oscillation witha core radius of 0.06 pc (6''), but an unresolved core cannot be ruled out. Acore this size is also expected in highly evolved clusters includingsignificant numbers of primordial binaries. A more massive cluster will providebetter statistics, as would star counts. The greater distance of the otherglobular clusters and the requirements of star counting will demand very highresolution observations to definitively resolve cores this size.Comment: 5 pages, TeX, 2 postscript figures appended, Io

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