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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 108 5726 Photometric data of NGC 6383
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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
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Bytes Format Units Label Explanations
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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
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Acknowledgements:
Gregor Rauw, rauw(at)astro.ulg.ac.be
(End) Gregor Rauw [IAGL, Belgium], Patricia Vannier [CDS] 29-Dec-2009