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J/A+A/511/A25       UBVRIHα photometry of NGC6383          (Rauw+, 2010)

A photometric and spectroscopic investigation of star formation in the very young open cluster NGC 6383. Rauw G., Manfroid J., De Becker M. <Astron. Astrophys. 511, A25 (2010)> =2010A&A...511A..25R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, UBVRI ; Photometry, H-alpha Keywords: stars: pre-main sequence - X-rays: stars - open clusters and associations: individual: NGC 6383 Abstract: The very young open cluster NGC 6383 centered on the O-star binary HD 159176 is an interesting place for studying the impact of early-type stars with strong radiation fields and powerful winds on the formation processes of low-mass stars. To investigate this process, it is necessary to determine the characteristics (age, presence, or absence of circumstellar material) of the population of low-mass pre-main-sequence (PMS) stars in the cluster. We obtained deep U B V Rc Ic Hα photometric data of the entire cluster as well as medium-resolution optical spectroscopy of a subsample of X-ray selected objects. Our spectroscopic data reveal only very weak Hα emission lines in a few X-ray selected PMS candidates. We photometrically identify a number of H-α emission candidates but their cluster membership is uncertain. We find that the fainter objects in the field of view have a wide range of extinction (up to AV=20), one X-ray selected OB star having AV∼8. Our investigation uncovers a population of PMS stars in NGC 6383 that are probably coeval with HD 159176. In addition, we detect a population of reddened objects that are probably located at different depths within the natal molecular cloud of the cluster. Finally, we identify a rather complex spatial distribution of Hα emitters, which is probably indicative of a severe contamination by foreground and background stars. Description: The photometric data are given for 5726 stars in the field of NGC 6383 which are detected in all filters. The colours are provided in the standard system. The data were obtained with the Wide Field Imager at the 2.2m telescope at La Silla. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 108 5726 Photometric data of NGC 6383
See also: J/MNRAS/357/345 : Pulsating pre-main-sequence stars in NGC6383 (Zintz+, 2005) J/A+A/462/157 : Stromgren CCD photometry in NGC 6383 (Paunzen+, 2007) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 I8 --- Seq Internal number of the source 10- 19 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) 21- 30 F10.6 deg DEdeg Declination in decimal degrees (J2000) 32- 37 F6.3 mag Vmag Johnson V-band magnitude 39- 43 F5.3 mag e_Vmag Uncertainty on Vmag 45- 50 F6.3 mag U-V Johnson U-V colour index 52- 56 F5.3 mag e_U-V Uncertainty on U-V 58- 63 F6.3 mag B-V Johnson B-V colour index 65- 69 F5.3 mag e_B-V Uncertainty on B-V 71- 76 F6.3 mag V-Rc Johnson-Cousins V-Rc colour index 78- 82 F5.3 mag e_V-Rc Uncertainty on V-Rc 84- 89 F6.3 mag V-Ic Johnson-Cousins V-Ic colour index 91- 95 F5.3 mag e_V-Ic Uncertainty on V-Ic 97-102 F6.3 mag Rc-Ha Rc-Hα index 104-108 F5.3 mag e_Rc-Ha Uncertainty on the Rc-Hα index
Acknowledgements: Gregor Rauw, rauw(at)
(End) Gregor Rauw [IAGL, Belgium], Patricia Vannier [CDS] 29-Dec-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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