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J/A+A/531/A73       NGC 6167 and NGC 6193 multi-photometry        (Baume+, 2011)

The Ara OB1a association. Stellar population and star formation history. Baume G., Carraro G., Comeron F., de Elia G.C. <Astron. Astrophys. 531, A73 (2011)> =2011A&A...531A..73B
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, infrared Keywords: Open clusters and associations: general - open clusters and associations: individual: NGC 6193, NGC 6167 - stars: formation - stars: pre-main sequence Abstract: The Ara OB1a association is a nearby complex in the fourth Galactic quadrant where a number of young/embedded star clusters are projected close to more evolved, intermediate age clusters. It is also rich in interstellar matter, and contains evidences of the interplay between massive stars and their surrounding medium, like the rim HII region NGC 6188. We provide more solid estimates of the fundamental parameters (age and distance) of the two most prominent stellar clusters, NGC 6167 and NGC 6193, that may be used as a basis to study the star formation history of the region. The study is based on a photometric optical survey (UBVIHa) of NGC 6167 and NGC 6193 and their nearby field, complemented with public data from 2MASS-VVV, UCAC3 and IRAC-Spitzer in this region. We produced a uniform photometric catalogue and we estimated more robustly the fundamental parameters for NGC 6167, NGC 6193 and the IRAS 16375-4854 source. As a consequence, all of them are located at approximately the same distance from the Sun in the Sagittarius-Carina Galactic arm. However, the ages we estimated differ widely: NGC 6167 results to be an intermediate-age cluster (20-30Myr), NGC 6193 a very young one (1-5Myr) with PMS, Hα emitters, and class II objects; and the IRAS 16375-4854 source is revealed as the youngest of the three containing several YSOs. These results support a picture in which Ara OB1a is a region where star formation has proceeded for several tens of Myr up to the present. The difference in ages of different stellar groups can be interpreted as a consequence of a triggered star formation process. Additionally, in the specific case of NGC 6193, an indication of possible non-coeval star formation was found. Description: Two astrometric, photometric (13 bands) catalogues covering both NGC 6167 (33193 objects) and NGC 6193 (39338 objects) regions. They includes X-Y positions; 2MASS identification (when available); equatorial coordinates (epoch J2000.0); optical (UBVI and Ha-on/off), NIR 2MASS/VVV (JHK), MIR IRAC-SST (3.6, 4.5, 5,8 and 8.0 bands) photometry. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ngc6167.dat 271 33193 Astrometry/photometry of NGC 6167 region ngc6167.vot 217 265593 VOTable version of ngc6167.dat ngc6193.dat 271 39338 Astrometry/photometry of NGC 6193 region ngc6193.vot 217 314753 VOTable version of ngc6193.dat
See also: I/315 : UCAC3 Catalogue (Zacharias+ 2009) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: ngc6167.dat ngc6193.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Seq Sequential number 7- 18 F12.8 deg RAdeg Right ascension in decimal degrees (J2000) 20- 31 F12.8 deg DEdeg Declination in decimal degrees (J2000) 33- 39 F7.2 pix Xpos X position 41- 47 F7.2 pix Ypos Y position 49- 54 F6.3 mag Vmag Johnson V magnitude 56- 61 F6.3 mag e_Vmag ?=99.990 rms uncertainty on Vmag 63- 68 F6.3 mag B-V ?=99.990 B-V colour index 70- 75 F6.3 mag e_B-V ?=99.990 rms uncertainty on B-V 77- 82 F6.3 mag U-B ?=99.990 U-B colour index 84- 89 F6.3 mag e_U-B ?=99.990 rms uncertainty on U-B 91- 96 F6.3 mag V-I ?=99.990 V-I colour index 98-103 F6.3 mag e_V-I ?=99.990 rms uncertainty on V-I 105-110 F6.3 mag Ha ?=99.999 Hα index ΔHα [=Hα(on)-Hα(off)] 112-117 F6.3 mag e_Ha ?=99.990 rms uncertainty on Ha 119-126 F8.3 0.1nm W(Ha) ?=999.990 Estimated Hα equivalent width 128-133 F6.3 0.1nm e_W(Ha) ?=99.990 rms uncertainty on W(Ha) 135-140 F6.3 mag Jmag ?=99.999 2MASS J magnitude 142-147 F6.3 mag e_Jmag ?=99.999 rms uncertainty on Jmag 149-154 F6.3 mag Hmag ?=99.999 2MASS H magnitude 156-161 F6.3 mag e_Hmag ?=99.999 rms uncertainty on Hmag 163-168 F6.3 mag Kmag ?=99.999 2MASS Ks magnitude 170-175 F6.3 mag e_Kmag ?=99.999 rms uncertainty on Kmag 177-182 F6.3 mag [3.6] ?=99.999 Spitzer/IRAC 3.6um magnitude 184-189 F6.3 mag e_[3.6] ?=99.999 rms uncertainty on [3.6] 191-196 F6.3 mag [4.5] ?=99.999 Spitzer/IRAC 4.5um magnitude 198-203 F6.3 mag e_[4.5] ?=99.999 rms uncertainty on [4.5] 205-210 F6.3 mag [5.8] ?=99.999 Spitzer/IRAC 5.8um magnitude 212-217 F6.3 mag e_[5.8] ?=99.999 rms uncertainty on [5.8] 219-224 F6.3 mag [8.0] ?=99.999 Spitzer/IRAC 8.0um magnitude 226-231 F6.3 mag e_[8.0] ?=99.999 rms uncertainty on [8.0] 233-238 F6.3 mag f.mag ?=99.999 UCAC3 fit magnitude (Cat. I/315) 240-247 F8.3 mas/yr pmRA ?=99.999 Proper motion along RA 249-255 F7.3 mas/yr e_pmRA ?=99.999 rms uncertainty on pmRA 257-264 F8.3 mas/yr pmDE ?=99.999 Proper motion along DE 266-271 F6.3 mas/yr e_pmDE ?=99.999 rms uncertainty on pmDE
Acknowledgements: Gustavo Baume, gbaume(at)
(End) Patricia Vannier [CDS] 04-May-2011
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