J/A+A/462/157 Investigating star formation in NGC 6383 (Paunzen+, 2007) ================================================================================ Investigating star formation in the young open cluster NGC 6383 Paunzen E., Netopil M., Zwintz K. =2007A&A...462..157P ================================================================================ ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, uvby Keywords: stars: pre-main sequence, early-type, formation - open clusters and associations: individual: NGC 6383 Abstract: By studying young open clusters, the mechanisms important for star formation over several Myr can be examined. For example, accretion rate as a function of rotational velocity can be investigated. Similarly, sequential star formation triggered by massive stars with high mass-loss rates can be studied in detail. We identified and characterized probable members of NGC 6383, as well as determined cluster parameters. New Stromgren uvby CCD photometry, obtained by us, is presented. This new data, together with Johnson UBV and 2MASS data in the NIR, was used to investigate characteristics of pre- as well as zero age main sequence cluster members. We present Stromgren uvby CCD photometry for 272 stars in the field of NGC 6383 and derive its reddening, E(b-y)=0.21(4)mag, as well as distance, d=1.7(3)kpc from the Sun. Several stars with NIR excess and objects in the domain of the classical Herbig Ae/Be and T Tauri stars were detected. Two previously known variables were identified as rapidly-rotating PMS stars. The field population is clearly separated from the probable members in the color-magnitude diagram. NGC 6383 is a young open cluster, with an age of less than 4 Myr, undergoing continuous star formation. True pre-main sequence members might be found down to absolute magnitudes of +6mag, with a variety of rotational velocities and stellar activities. Description: Photometric CCD uvby measurements of objects within the open cluster NGC 6383 were obtained at ESO-La Silla (Proposal 073.C-0144). Object: ---------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------- 17 34 48 -32 34.0 NGC 6383 = C 1731-325 ---------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- × ReadMe.txt 80 . This file × table1.dat 147 272 Observed program stars of NGC 6383 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- Seq Stars number sorted after X and Y 5- 7 I3 --- No2 ? Notation according to WEBDA 9- 14 F6.1 pix Xpos X coordinate 16- 21 F6.1 pix Ypos Y coordinate 23- 32 F10.7 h RA Right Ascension (J2000.0) 34- 44 F11.7 deg Del Declination (J2000.0) 46- 50 F5.3 mag b-y Stromgren b-y colour index 52- 56 F5.3 mag e_b-y Error in b-y 58- 63 F6.3 mag m1 Stromgren m1 index 65- 69 F5.3 mag e_m1 Error in m1 71- 76 F6.3 mag c1 Stromgren c1 index 78- 82 F5.3 mag e_c1 Error in c1 84- 89 F6.3 mag Vmag Calibrated Johnson V magnitude 91- 95 F5.3 mag e_Vmag Error in V magnitude 97- 100 F6.3 mag Vlit Johnson V magnitude from WEBDA 104- 108 F5.3 mag B-V Johnson B-V colour index from WEBDA 110- 115 F6.3 mag J 2MASS J magnitude 117- 121 F5.3 mag e_J Error in J magnitude 123- 128 F6.3 mag H 2MASS H magnitude 130- 134 F5.3 mag e_H Error in H magnitude 136- 141 F6.3 mag K 2MASS K magnitude 143- 147 F5.3 mag e_K Error in K magnitude -------------------------------------------------------------------------------- Acknowledgements: Ernst Paunzen, ernst.paunzen(at)univie.ac.at ================================================================================ (End) Ernst Paunzen [Vienna, Austria]