J/A+A/349/448 Open star clusters. I. NGC 581 (M 103) (Sanner+, 1999) ================================================================================ Photometric and kinematic studies of open star clusters. I. NGC 581 (M 103). Sanner J., Geffert M., Brunzendorf J., Schmoll J. =1999A&A...349..448S (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBV ; Proper motions Keywords: Galaxy: open clusters and associations: individual: NGC 581 (M 103) - astrometry - stars: kinematics - stars: Hertzsprung-Russel (HR) and C-M diagrams - stars: luminosity function, mass function Abstract: We present CCD photometry and a proper motion study of the young open star cluster, NGC 581 (M 103). Fitting isochrones to the colour magnitude diagram, we found an age of 16+/-4Myr and a distance of roughly 3kpc for this cluster. The proper motion study identifies 77 stars of V=14.5mag or brighter to be cluster members. We combine membership determination by proper motions and statistical field star subtraction to derive the IMF of the cluster and find a quite steep slope of {Gamma}=-1.80. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table4.dat 56 2134 BV photometry table7.dat 48 2387 Proper motions -------------------------------------------------------------------------------- See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-per-byte Description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 2- 7 I6 --- Seq Star number 10- 17 F8.3 pix xpos X position on CCD (1) 20- 27 F8.3 pix ypos Y position on CCD (1) 29- 34 F6.3 mag B-V B-V colour 37- 42 F6.3 mag Vmag V magnitude 45- 49 F5.3 mag e_Bmag Photometric error in B 52- 56 F5.3 mag e_Vmag Photometric error in V -------------------------------------------------------------------------------- Note (1): 1 pix = 0.8". -------------------------------------------------------------------------------- Byte-per-byte Description of file: table7.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 2- 7 I6 --- Seq Star number 9- 10 I2 h RAh Right ascension (2000.0) 12- 13 I2 min RAm Right ascension (2000.0) 15- 20 F6.3 s RAs Right ascension (2000.0) 22 A1 --- DE- Declination sign (2000.0) 23- 24 I2 deg DEd Declination (2000.0) 26- 27 I2 arcmin DEm Declination (2000.0) 29- 33 F5.2 arcsec DEs Declination (2000.0) 35- 40 F6.2 mas/yr pmRA Proper motion in RA (mu_alpha cos delta) 42- 48 F7.2 mas/yr pmDE Proper motion in DE -------------------------------------------------------------------------------- Acknowledgements: Joerg Sanner ================================================================================ (End) Patricia Bauer [CDS] 30-Sep-1999