2010A&A...511A..25R

Query : 2010A&A...511A..25R

2010A&A...511A..25R - Astronomy and Astrophysics, volume 511A25-25 (2010/2-2)

A photometric and spectroscopic investigation of star formation in the very young open cluster NGC 6383.

RAUW G., MANFROID J. and DE BECKER M.

Abstract (from CDS):

The very young open cluster NGC6383 centered on the O-star binary HD159176 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 UBV(RI)cHα 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 Hα 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 NGC6383 that are probably coeval with HD159176. 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.

Abstract Copyright: ∼

Journal keyword(s): stars: pre-main sequence - X-rays: stars - open clusters and associations: individual: NGC6383

VizieR on-line data: <Available at CDS (J/A+A/511/A25): table2.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
2 2MASS J17334033-3233107 * 17 33 40.3419328224 -32 33 10.713392136           K0V 5 0
3 2MASS J17334481-3240531 * 17 33 44.8169179440 -32 40 53.019691968           F5V 4 0
4 XMMU J173349.0-323332 X 17 33 49.0 -32 33 32           ~ 2 0
5 HD 317861 Be* 17 34 02.2308373896 -32 40 39.739842876   10.07 9.83     B3Ve 16 0
6 2MASS J17341759-3236247 * 17 34 17.5951303272 -32 36 24.707397096           ~ 2 0
7 Cl* NGC 6383 ZMR 268 * 17 34 19.2895111704 -32 40 21.301470084   16.212 15.043     G0-5V 6 0
8 XMMU J173426.2-323759 * 17 34 26.2 -32 37 59           K0V 2 0
9 Cl* NGC 6383 ZMR 83 * 17 34 31.6758372336 -32 33 24.881679396   16.435 15.077     K2V 4 0
10 V* V486 Sco Or* 17 34 37.8541369152 -32 36 18.594147276   13.196 12.651 12.642   A5IIIp 27 0
11 XMMU J173438.7-323512 X 17 34 38.7 -32 35 12           ~ 2 0
12 Cl* NGC 6383 ZMR 126 * 17 34 40.25 -32 34 30.7   16.370 15.072     K2-4V 3 0
13 NGC 6383 OpC 17 34 41.6 -32 34 27           ~ 168 0
14 HD 159176 Be* 17 34 42.4921337376 -32 34 53.995451196 4.88 5.74 5.70 7.19   O7V 261 0
15 2MASS J17344581-3233180 * 17 34 45.8048913672 -32 33 18.218032344           K7V 4 0
16 XMMU J173446.3-323216 X 17 34 46.16 -32 32 16.2           ~ 2 0
17 XMMU J173447.8-324108 * 17 34 47.8 -32 41 08           G7V 2 0
18 NGC 6383 24 * 17 34 47.9401337040 -32 35 20.260696704   11.52 11.32 11.44   B5-7V 19 0
19 NGC 6383 23 * 17 34 47.9536047855 -32 34 21.771575836   14.74 13.79     G0-1IV 14 0
20 Cl* NGC 6383 ZMR 65 * 17 34 48.3465428856 -32 31 53.961864960   16.44 15.20 15.12   K0-5III 6 0
21 Cl* NGC 6383 ZMR 105 * 17 34 53.0287795248 -32 33 57.970097100   15.185 14.043     G5III-IV 11 0
22 Cl* NGC 6383 ZMR 115 * 17 34 56.59 -32 34 20.3   15.259 14.272     G5-K0V 3 0
23 XMMU J173500.6-323422 * 17 35 00.6536209785 -32 34 19.831522961           G5-K0IV 5 0
24 XMMU J173507.9-322905 X 17 35 07.9 -32 29 05           ~ 2 0
25 XMMU J173530.9-323558 * 17 35 30.9 -32 35 58           O9-B5 3 0
26 LP 877-23 PM* 22 52 41.0353986762 -20 35 32.994432457   13.02 11.90     ~ 119 0

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