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J/A+A/385/867       CCD Δa-photometry of 5 open clusters  (Paunzen+, 2002)

CCD photometric search for peculiar stars in open clusters. III. NGC 2439, NGC 3960, NGC 6134, NGC 6192 and NGC 6451. Paunzen E., Maitzen H.M. <Astron. Astrophys. 385, 867 (2002)> =2002A&A...385..867P
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, narrow-band Keywords: stars: chemically peculiar - stars: early-type - techniques: photometric - open clusters and associations: general Description: In total, more than 550 objects within the fields of five open clusters (NGC 2439, NGC 3960, NGC 6134, NGC 6192 and NGC 6451) were investigated in order to find classical chemically peculiar stars. One bona-fide CP candidate was detected in each of the open clusters NGC 3960, NGC 6192 and NGC 6451. All three objects seem to be members of the corresponding cluster taking the results from our photometry as well as from the literature. For NGC 6192 and NGC 6451 we found widely different interstellar reddening values and therefore distances and ages in the literature. From an analysis of published Johnson UBVRI photometry, we were able to rule out a rather old age for NGC 6451. This is also supported by the finding of one peculiar object in this cluster with spectral type of about A2. Five variable objects within the field of NGC 6134 were detected. The variability exceeds 10 times (or typically 0.03 mag) the standard deviation of the weighted individual measurements. But since our observations were obtained mostly during one hour (typical integration times of five minutes per filter) on several nights within 45 days, no light curves could yet be derived. For this cluster some Am candidates were reported for which we were not able to detect a significant positive Δ a-value. For a description of the Δa photometric system, see e.g. GCPD/75 Objects: ---------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------- 07 40 48 -31 39.0 NGC 2439 11 50 54 -55 42.0 NGC 3960 16 27 42 -49 09.0 NGC 6134 16 40 18 -43 22.0 NGC 6192 17 50 42 -30 13.0 NGC 6451 ---------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 82 113 Observed program stars of NGC 2439 table5.dat 78 93 Observed program stars of NGC 3960 table6.dat 85 102 Observed program stars of NGC 6134 table7.dat 83 98 Observed program stars of NGC 6192 table8.dat 86 146 Observed program stars of NGC 6451
See also: J/A+A/371/L5 : CCD Δa-photometry of NGC 1866 (Maitzen+, 2001) J/A+A/373/153 : NGC 2489, 2567, 2658, 5281 and 6208 (Paunzen+, 2001) J/A+A/395/823 : Collinder 272, Pismis 20, Lynga 14, NGC 6396 and 6611 (Paunzen+, 2002) J/A+A/412/721 : NGC 2099, 3114, 6204, 6705 and 6756 (Paunzen+, 2003) Table 1: Observing log. -------------------------------------------------------------------------------- Cluster Site Nights # g1 # g2 # y -------------------------------------------------------------------------------- NGC 2439 ESO 4 10 6 4 NGC 3960 ESO 3 7 5 5 NGC 6134 ESO 5 7 12 8 UTSO 1 2 2 1 NGC 6192 ESO 5 11 13 11 UTSO 1 1 1 1 NGC 6451 ESO 2 4 4 4 -------------------------------------------------------------------------------- Sites: ESO: Bochum 61 cm, ESO-La Silla UTSO: Helen-Sawyer-Hogg 61 cm telescope, UTSO-Las Campanas Observatory Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Number in NGC 2439, sorted after X and Y 5- 7 I3 --- W ? Notation according to White (1975ApJ...197...67W, NGC 2439 NNN) 9- 10 I2 --- Zug ? Notation according to Zug (1933LicOB..16..119Z, Cl* NGC 2439 ZUG NN) 12- 16 F5.1 pix Xpix X-coordinate (G1) 18- 22 F5.1 pix Ypix Y-coordinate (G1) 24- 29 F6.3 mag Vmag Mean V value 31- 35 F5.3 mag a Mean a index 37- 41 F5.3 mag e_a rms uncertainty on a 43- 48 F6.3 mag g1-y Mean (g1-y) index 50- 54 F5.3 mag e_g1-y rms uncertainty on (g1-y) 56- 64 E9.3 mag da(g1-y) Deviation from cluster line (Δa) 66- 69 F4.2 mag B-V ? (B-V) from the literature 71- 79 E9.3 mag da(B-V) ? Deviation from cluster line (Δa) 81- 82 I2 --- NObs Number of measurements
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Number in NGC 3960, sorted after X and Y 4- 6 I3 --- J ? Notation according to Janes (1981AJ.....86.1210J, NGC 3960 NNN)) 8- 12 F5.1 pix Xpix X-coordinate (G1) 14- 18 F5.1 pix Ypix Y-coordinate (G1) 20- 25 F6.3 mag Vmag Mean V value 27- 31 F5.3 mag a Mean a index 33- 37 F5.3 mag e_a rms uncertainty on a 39- 44 F6.3 mag g1-y Mean (g1-y) index 46- 50 F5.3 mag e_g1-y rms uncertainty on (g1-y) 52- 60 E9.3 mag da(g1-y) Deviation from cluster line (Δa) 62- 65 F4.2 mag B-V ? (B-V) from the literature 67- 75 E9.3 mag da(B-V) ? Deviation from cluster line (Δa) 77- 78 I2 --- NObs Number of measurements
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Nunber in NGC 6134, sorted after X and Y 5- 7 A3 --- L ? Notation according to Lindoff (1972A&AS....7..231L, NGC 6134 NNNa) 9- 12 I4 --- B ? Notation according to Bruntt et al. (1999A&AS..140..135B, Cl* NGC 6134 BFK NNNN) 14- 18 F5.1 pix Xpix X-coordinate (G1) 20- 24 F5.1 pix Ypix Y-coordinate (G1) 26- 31 F6.3 mag Vmag Mean V value 33- 37 F5.3 mag a Mean a index 39- 43 F5.3 mag e_a rms uncertainty on a 45- 50 F6.3 mag g1-y Mean (g1-y) index 52- 56 F5.3 mag e_g1-y rms uncertainty on (g1-y) 58- 66 E9.3 mag da(g1-y) Deviation from cluster line (Δa) 68- 72 F5.3 mag b-y ? (b-y) from the literature 74- 82 E9.3 mag da(b-y) ? Deviation from cluster line (Δa) 84- 85 I2 --- NObs Number of measurements
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Nunber in NGC 6192, sorted after X and Y 4- 6 I3 --- KF1 ? Notation according to Kilambi & Fitzgerald (1983BASI...11..226K, Cl* NGC 6192 KF NNN) 8- 10 I3 --- KF2 ? Notation according to Kjeldsen & Frandsen (1991A&AS...87..119K, Cl* NGC 6192 KJFR NNN) 12- 16 F5.1 pix Xpix X-coordinate (G1) 18- 22 F5.1 pix Ypix Y-coordinate (G1) 24- 29 F6.3 mag Vmag Mean V value 31- 35 F5.3 mag a Mean a index 37- 41 F5.3 mag e_a rms uncertainty on a 43- 48 F6.3 mag g1-y Mean (g1-y) index 50- 54 F5.3 mag e_g1-y rms uncertainty on (g1-y) 56- 64 E9.3 mag da(g1-y) Deviation from cluster line (Δa) 66- 70 F5.3 mag B-V ? (B-V) from the literature 72- 80 E9.3 mag da(B-V) ? Deviation from cluster line (Δa) 82- 83 I2 --- NObs Number of measurements
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Number in NGC 6451, sorted after X and Y 5- 7 I3 --- KF ? Notation according to Kjeldsen & Frandsen (1991A&AS...87..119K, Cl* NGC 6451 KF NNN) 9- 11 I3 --- P ? Notation according to Piatti et al. (1998ApJS..116..263P, Cl* NGC 6451 PCB NNN) 13- 17 F5.1 pix Xpix X-coordinate (G1) 19- 23 F5.1 pix Ypix Y-coordinate (G1) 25- 30 F6.3 mag Vmag Mean V value 32- 36 F5.3 mag a Mean a index 38- 45 E8.3 mag e_a rms uncertainty on a 47- 52 F6.3 mag g1-y Mean (g1-y) index 54- 58 F5.3 mag e_g1-y rms uncertainty on (g1-y) 60- 68 E9.3 mag da(g1-y) Deviation from cluster line (Δa) 70- 74 F5.3 mag B-V ? (B-V) from the literature 76- 83 E8.3 mag da(B-V) ? Deviation from cluster line (Δa) 85- 86 I2 --- NObs Number of measurements
Global notes: Note (G1): Finding charts: North is to the right and west is upwards; 1 pixel = 0.5". The finding charts are available in the paper (Figure 1).
Acknowledgements: Ernst Paunzen References: Bayer et al., Paper I 2000A&AS..147...99B Paunzen & Maitzen, Paper II 2001A&A...373..153P, Cat. J/A+A/373/153 Paunzen et al., Paper IV 2002A&A...395..823P, Cat. J/A+A/395/823
(End) E. Paunzen [IfA, Vienna], Patricia Bauer [CDS] 29-Apr-2002
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