UBVI CCD photometry of M11 — II. New photometry and surface density profiles
Hwankyung SungDepartment of Earth Science Education, Kyungpook National University, Taegu 702‐701, KoreaM. S. BessellResearch School of Astronomy & Astrophysics, The Australian National University, Private Bag, Weston Creek PO, ACT 2611, AustraliaHee‐Won LeeDepartment of Astronomy and Atmospheric Sciences, Kyungpook National University, Taegu 702‐701, KoreaYong Hee KangDepartment of Earth Science Education, Kyungpook National University, Taegu 702-701 KoreaSee-Woo LeeDepartment of Astronomy, Seoul National University,#N#Seoul 151-742,#N#Korea
1999en
ABI
Аннотация
Extensive UBVI CCD photometry has been obtained for the intermediate-age open cluster M11 (NGC 6705). From this new photometry we derive the cluster parameters V0-MV = 11.55±0.10, E(B-V) = 0.428±0.027 and radius = 16 arcmin] and age (log tage = 8.4±0.1). We also derive density profiles and confirm the mass segregation in M11. The slope of the mass function increases systematically with increasing radius from the centre. We also confirm the existence of main-sequence field stars having similar photometric characteristics to M11. A large population of field red giant stars is also found in the observed fields.
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