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J/A+A/395/823       CCD Δa-photometry of 5 open clusters  (Paunzen+, 2002)

CCD photometric search for peculiar stars in open clusters. IV. Collinder 272, Pismis 20, Lynga 14, NGC 6396 and NGC 6611 Paunzen E., Maitzen H.M. <Astron. Astrophys. 395, 823 (2002)> =2002A&A...395..823P
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, narrow-band Keywords: stars: chemically peculiar - stars: early-type - techniques: photometric - open clusters and associations: general Abstract: The time scale on which chemical peculiarity in upper main sequence stars begins is unknown. Results from the Hipparcos measurements indicate that the classical chemically peculiar (CP) stars occupy the whole area from the zero age main sequence to the terminal age main sequence. Hubrig et al. (2000ApJ...539..352H) reported that the magnetic fields appear only in stars that have already completed at least approximately 30% of their main sequence life time. Previous observations in the very young Orion OB1 and Scorpio Centaurus associations reveal a percentage of chemically peculiar stars that is significantly smaller (less than 5%) than that of the galactic field (up to 25%). This already indicates that the phenomenon needs at least several Myr to appear. Since no further observations have been published since then, we have observed the five very young (1Myr<Age<25Myr) open clusters Collinder 272, Pismis 20, Lynga 14, NGC 6396 and NGC 6611. Photometry from 250 CCD frames in the three filter Delta a-system results in very low detection limits (0.008 to 0.015mag). We find no single photometrically chemically peculiar candidate in approximately 460 observed cluster members in the five program clusters. From the number of observed objects we deduce upper limits between 0.6% and 2.4% for the incidence of CP stars for the five observed aggregates.The tables presented here include all photometric observations of these five clusters. For a description of the (Delta a) photometric system, see e.g. GCPD/75: a = g2 - (g1+y)/2 g1 and g2 centered at 502 and 524nm. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 13 30 36. -61 16 00 Cl Collinder 272 15 15 24. -59 04 00 Cl Pismis 20 16 55 00.8 -45 20 00 Cl Lynga 14 17 38 06. -35 00 00 NGC 6396 18 18 48. -13 47 00 NGC 6611 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 75 111 Observed program stars of Collinder 272 table5.dat 80 238 Observed program stars of Pismis 20 table6.dat 72 53 Observed program stars of Lynga 14 table7.dat 71 105 Observed program stars of NGC 6396 table8.dat 85 79 Observed program stars of NGC 6611
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/385/867 : NGC 2439, 3960, 6134, 6192 and 6451 (Paunzen+, 2002) J/A+A/412/721 : NGC 2099, 3114, 6204, 6705 and 6756 (Paunzen+, 2003) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Number in Collinder 22, sorted after X and Y Cl* Collinder 272 PPM NNN in Simbad 5- 7 I3 --- WEBDA ? Notation according to WEBDA (Cl* Collinder 272 VBF NNN in Simbad) 9- 13 F5.1 pix Xpos X-coordinate 15- 19 F5.1 pix Ypos Y-coordinate 21- 26 F6.3 mag Vmag Mean V value 28- 32 F5.3 mag a Mean a index (Maitzen) 34- 38 F5.3 mag e_a Sigma a 40- 45 F6.3 mag g1-y Mean (g1-y) index 47- 51 F5.3 mag e_g1-y Sigma (g1-y) 53- 61 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- 72 F6.3 mag da(B-V) ? Deviation from cluster line (Delta a) 74- 75 I2 --- Obs Number of observations
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Number in Pismis 20, sorted after X and Y Cl* Pismis 20 PPM NNN in Simbad 5- 8 I4 --- WEBDA ? Notation according to WEBDA 10- 14 F5.1 pix Xpos X-coordinate 16- 20 F5.1 pix Ypos Y-coordinate 22- 27 F6.3 mag V0 Mean V0 value 29- 33 F5.3 mag acorr Mean a(corr) index (Maitzen) 35- 39 F5.3 mag e_acorr Sigma a(corr) 41- 46 F6.3 mag (g1-y)0 Mean (g1-y)0 index 48- 52 F5.3 mag e_(g1-y)0 Sigma (g1-y)0 54- 59 F6.3 mag da(g1-y)0 Deviation from cluster line (Delta a) 61- 65 F5.2 mag (B-V)0 ? (B-V)0 from the literature 67- 72 F6.3 mag da(B-V0) ? Deviation from cluster line (Delta a) 74- 77 F4.2 mag E(B-V) Reddening 79- 80 I2 --- Obs Number of observations
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Number in Lynga 14, sorted after X and Y Cl* Lynga 14 PPM NNN in Simbad 5- 8 I4 --- WEBDA ? Notation according to WEBDA (Cl* Lynga 14 NNN in Simbad) 10- 14 F5.1 pix Xpos X-coordinate 16- 20 F5.1 pix Ypos Y-coordinate 22- 27 F6.3 mag V0 Mean V0 value 29- 33 F5.3 mag acorr Mean a(corr) index 35- 39 F5.3 mag e_acorr Sigma a(corr) 41- 46 F6.3 mag (g1-y)0 Mean (g1-y)0 index 48- 52 F5.3 mag e_(g1-y)0 Sigma (g1-y)0 54- 59 F6.3 mag da(g1-y)0 Deviation from cluster line (Delta a) 61- 64 F4.2 mag (B-V)0 ? (B-V)0 from the literature 66- 69 F4.2 mag E(B-V) reddening 71- 72 I2 --- Obs Number of observations
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Number in NGC 6369, sorted after X and Y Cl* NGC 6369 PPM NNN in Simbad 5- 6 I2 --- MV ? Notation according to Moffat & Vogt (1975A&AS...20..155M, NGC 6396 NN) 8- 12 F5.1 pix Xpos X-coordinate 14- 18 F5.1 pix Ypos Y-coordinate 20- 25 F6.3 mag V0 Mean V0 value 27- 31 F5.3 mag acorr Mean a(corr) index (Maitzen) 33- 37 F5.3 mag e_acorr Sigma a(corr) 39- 44 F6.3 mag (g1-y)0 Mean (g1-y)0 index 46- 50 F5.3 mag e_(g1-y)0 Sigma (g1-y)0 52- 57 F6.3 mag da(g1-y)0 Deviation from cluster line (Delta a) 59- 63 F5.2 mag (B-V)0 ? (B-V)0 from the literature 65- 68 F4.2 mag E(B-V) reddening 70- 71 I2 --- Obs Number of observations
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Number in NGC 6611, sorted after X and Y Cl* NGC 6611 PPM NNN in Simbad 4- 8 I5 --- BKP ? Notation according to Belikov et al. (1999, Cat. J/A+AS/134/525, Cl* NGC 6611 BKP NNNNN) 10- 12 I3 --- No3 ? Notation according to WEBDA (NGC 6611 NNN in Simbad) 14- 18 F5.1 pix Xpos X-coordinate 20- 24 F5.1 pix Ypos Y-coordinate 26- 31 F6.3 mag V0 Mean V0 value 33- 37 F5.3 mag acorr Mean a(corr) index (Maitzen) 39- 43 F5.3 mag e_acorr Sigma a(corr) 45- 50 F6.3 mag (g1-y)0 Mean (g1-y)0 index 52- 56 F5.3 mag e_(g1-y)0 Sigma (g1-y)0 58- 63 F6.3 mag da(g1-y)0 Deviation from cluster line (Delta a) 65- 70 F6.3 mag (B-V)0 ? (B-V)0 from the literature 72- 77 F6.3 mag da(B-V)0 ? Deviation from cluster line (Delta a) 79- 82 F4.2 mag E(B-V) reddening 84- 85 I2 --- Obs Number of observations
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 & Maitzen, Paper III 2002A&A...385..867P, Cat. J/A+A/385/867
(End) Patricia Bauer [CDS] 22-Nov-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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