2001/01/30 by J. Sanner, Joerg Sanner, J. Brunzendorf +5 · 34 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Distance modulus #Initial mass function #Open cluster #Photometry (optics) #Physics #Proper motion #Star (game theory) #Star cluster #Star formation #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20010196
published in Astronomy and Astrophysics 369(2), 511-526 (EDP Sciences) · 16 pages, 14 figures, accepted for publication in Astronomy & Astrophysics
arxiv created 2001/01/30 · openalex publication_date 2001/04/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present CCD photometry and proper motion studies of the three open star clusters NGC 4103, NGC 5281, and NGC 4755 (κ Cru). By fitting isochrones to the colour magnitude diagrams, we found that all three objects are young open star clusters with ages of at most . They are located at distances from approx. to , derived from distance moduli ranging from to . We combined membership determinations based on proper motions and statistical field star subtraction to derive the initial mass function (IMF) of the clusters. The shape of the IMFs could be represented by power laws with exponents of for NGC 4103, for NGC 5281, and for NGC 4755, when -as a reference -Salpeter's ([CITE]) value would be . These results agree well with other IMF studies of open star clusters.