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 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:
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RA (2000) DE Designation(s)
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17 34 48 -32 34.0 NGC 6383 = C 1731-325
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 149 272 Observed program stars of NGC 6383
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See also:
J/MNRAS/357/345 : Pulsating pre-main-sequence stars in NGC6383 (Zintz+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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Acknowledgements:
Ernst Paunzen, ernst.paunzen(at)univie.ac.at
(End) Ernst Paunzen [Vienna, Austria], Patricia Vannier [CDS] 01-Feb-2007