Optical and near-infrared photometric study of NGC 6724

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2018,（2）
• 页码范围: 37-42
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-4527/18/2/16

摘要

BVRI CCD photometry of the poorly studied open cluster NGC 6724 has been carried out down to a limiting magnitude of V～20 mag.The stars of the cluster have been observed using the Newtonian focus (f/4.84) of the 74-inch telescope at Kottamia Astronomical Observatory in Egypt.Also,the 2MASS-JHK system is used to confirm the results we obtained.The main photometric parameters have been estimated for the present object;the diameter is found to be 6 arcmin,the distance is 1530±60pc from the Sun and the age is 900±50Myr.The optical reddening E(B-V) =0.65 mag,while the infrared reddening is E(J-H) =0.20 mag.The slope of the mass function distribution and the relaxation time estimations indicate that cluster NGC 6724 is dynamically relaxed.