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J/A+A/385/867 CCD {Delta}a-photometry of 5 open clusters (Paunzen+, 2002)
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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
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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 {Delta} a-value.
For a description of the {Delta}a photometric system, see e.g.
<GCPD/75>
Objects:
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RA (2000) DE Designation(s)
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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
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File Summary:
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FileName Lrecl Records Explanations
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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
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See also:
J/A+A/371/L5 : CCD {Delta}a-photometry of NGC 1866 (Maitzen+, 2001)
J/A+A/373/153 : CCD {Delta}a-photometry of 5 open clusters (Paunzen+, 2001)
Table 1: Observing log.
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Cluster Site Nights # g1 # g2 # y
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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
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Sites: ESO: Bochum 61 cm, ESO-La Silla
UTSO: Helen-Sawyer-Hogg 61 cm telescope, UTSO-Las Campanas Observatory
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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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 --- RP ? Notation according to Ramsay & Pollaco (1992,
Cat. <J/A+AS/94/73>, Cl* NGC 2439 RP 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 ({Delta}a)
66- 69 F4.2 mag B-V ? (B-V) from the literature
71- 79 E9.3 mag da(B-V) ? Deviation from cluster line ({Delta}a)
81- 82 I2 --- NObs Number of measurements
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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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 ({Delta}a)
62- 65 F4.2 mag B-V ? (B-V) from the literature
67- 75 E9.3 mag da(B-V) ? Deviation from cluster line ({Delta}a)
77- 78 I2 --- NObs Number of measurements
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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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 ({Delta}a)
68- 72 F5.3 mag b-y ? (b-y) from the literature
74- 82 E9.3 mag da(b-y) ? Deviation from cluster line ({Delta}a)
84- 85 I2 --- NObs Number of measurements
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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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)
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 ({Delta}a)
66- 70 F5.3 mag B-V ? (B-V) from the literature
72- 80 E9.3 mag da(B-V) ? Deviation from cluster line ({Delta}a)
82- 83 I2 --- NObs Number of measurements
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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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)
9- 11 I3 --- P ? Notation according to Piatti et al.
(1998ApJS..116..263P, Cl* NGC 6451 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 ({Delta}a)
70- 74 F5.3 mag B-V ? (B-V) from the literature
76- 83 E8.3 mag da(B-V) ? Deviation from cluster line ({Delta}a)
85- 86 I2 --- NObs Number of measurements
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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).
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Acknowledgements: Ernst Paunzen <Ernst.Paunzen@univie.ac.at>
References:
Bayer et al., Paper I 2000A&AS..147...99B
Paunzen & Maitzen, Paper II 2001A&A...373..153P, Cat. <J/A+A/373/153>
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(End) E. Paunzen [IfA, Vienna], Patricia Bauer [CDS] 29-Apr-2002