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J/A+A/462/157       Stromgren CCD photometry in NGC 6383     (Paunzen+, 2007)

Investigating star formation in the young open cluster NGC 6383. Paunzen E., Netopil M., Zwintz K. <Astron. Astrophys., 462, 157-162 (2007)> =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 4Myr, 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 80 . This file table1.dat 149 272 Observed program stars of NGC 6383
See also: J/MNRAS/357/345 : Pulsating pre-main-sequence stars in NGC6383 (Zintz+, 2005) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- PNZ [1/337] Stars number sorted after X and Y, Cl* NGC 6383 PNZ NNN in Simbad 5- 7 I3 --- No2 ? Notation according to WEBDA 9- 15 F7.1 pix Xpos X coordinate 17- 23 F7.1 pix Ypos Y coordinate 25- 34 F10.7 h RAhour Right Ascension in decimal hours (J2000.0) 36- 46 F11.7 deg DEdeg Declination in decimal degrees (J2000.0) 48- 52 F5.3 mag b-y Stromgren b-y colour index 54- 58 F5.3 mag e_b-y Error in b-y 60- 65 F6.3 mag m1 ?=- Stromgren m1 index 67- 71 F5.3 mag e_m1 ?=- Error in m1 73- 78 F6.3 mag c1 ?=- Stromgren c1 index 80- 84 F5.3 mag e_c1 ?=- Error in c1 86- 91 F6.3 mag Vmag Calibrated Johnson V magnitude 93- 97 F5.3 mag e_Vmag Error in V magnitude 99-104 F6.3 mag Vmaglit ?=- Johnson V magnitude from WEBDA 106-110 F5.3 mag B-V ?=- Johnson B-V colour index from WEBDA 112-117 F6.3 mag Jmag ?=- 2MASS J magnitude 119-123 F5.3 mag e_Jmag ?=- Error in J magnitude 125-130 F6.3 mag Hmag ?=- 2MASS H magnitude 132-136 F5.3 mag e_Hmag ?=- Error in H magnitude 138-143 F6.3 mag Kmag ?=- 2MASS K magnitude 145-149 F5.3 mag e_Kmag ?=- Error in K magnitude
Acknowledgements: Ernst Paunzen, ernst.paunzen(at)univie.ac.at
(End) Ernst Paunzen [Vienna, Austria], Patricia Vannier [CDS] 01-Feb-2007
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