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J/A+A/412/721    CCD Δa-photometry of 5 open clusters     (Paunzen+, 2003)

CCD photometric search for peculiar stars in open clusters. V. NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756. Paunzen E., Pintado O.I., Maitzen H.M. <Astron. Astrophys., 412, 721-725 (2003)> =2003A&A...412..721P
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, narrow-band Keywords: stars: chemically peculiar - stars: early-type - techniques: photometric - open clusters and associations: general Abstract: We have investigated 1008 objects in the area of five intermediate age open clusters (NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756) via the narrow band Δa-system. The detection limit for photometric peculiarity is very low (always less than 0.009mag) due to the high number of individual frames used (193 in total). We have detected six peculiar objects in NGC 6705 and NGC 6756 from which one in the latter is almost certainly an unreddened late type foreground star. The remaining five stars are probably cluster members and bona fide chemically peculiar objects (two are λ Bootis type candidates). Furthermore, we have investigated NGC 3114, a cluster for which already photoelectric Δa-measurements exist. A comparison of the CCD and photoelectric values shows very good agreement. Again, the high capability of our CCD Δa-photometric system to sort out true peculiar objects together with additional measurements from broad or intermediate band photometry is demonstrated. Description: Observations of the five open clusters were performed with the Bochum 61cm (ESO-La Silla), the Helen-Sawyer-Hogg 61cm telescope (UTSO-Las Campanas Observatory), the 2.15m telescope at the Complejo Astronomico el Leoncito (CASLEO) and the L. Figl Observatory (FOA) with the 150cm telescope on Mt. Schopfl (Austria) using the multimode instrument OEFOSC (see the observation log in Table 1). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) (File) ---------------------------------------------------------- 05 52 19 +32 33 12 NGC 2099 (table4.dat) 10 02 42 -60 07 00 NGC 3114 (table5.dat) 16 46 08 -47 00 44 NGC 6204 (table6.dat) 18 51 06 -06 16 00 NGC 6705 (table7.dat) 19 08 42 +04 41 00 NGC 6756 (table8.dat) ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 69 41 Observed program stars of NGC 2099 table5.dat 62 271 Observed program stars of NGC 3114 table6.dat 74 319 Observed program stars of NGC 6204 table7.dat 81 312 Observed program stars of NGC 6705 table8.dat 74 65 Observed program stars of NGC 6756
See also: GCPD/75 : Maitzen (1976A&A....51..223M) δ photometry 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/395/823 : Collinder 272, Pismis 20, Lynga 14, NGC 6396 and 6611 (Paunzen+, 2002) Table 1: Observing log --------------------------------------------------- Cluster Site Date #N #g1 #g2 #y --------------------------------------------------- NGC 2099 FOA 03.1998 1 2 2 2 NGC 3114 CASLEO 11.1998 4 14 17 19 NGC 6204 CASLEO 08.2001 2 20 15 20 NGC 6705 ESO 05.1995 5 15 15 13 NGC 6756 ESO 05.1995 4 11 13 11 UTSO 05.1995 1 1 2 1 Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Notation for stars sorted after X and Y 4- 6 I3 --- WEBDA Notation according to WEBDA 8- 12 F5.1 pix Xpos X-coordinate on CCD 14- 18 F5.1 pix Ypos Y-coordinate on CCD 20- 25 F6.3 mag Vmag Mean V value 27- 31 F5.3 mag a Mean a index (a = g2 - [(g1+y)/2]) 33- 37 F5.3 mag e_a Sigma a 39- 44 F6.3 mag g1-y Mean (g1-y) index 46- 50 F5.3 mag e_g1-y Sigma (g1-y) 52- 57 F6.3 mag da(g1-y) Deviation from cluster line (Δa) 59- 63 F5.3 mag B-V (B-V) from the literature 64- 69 F6.3 mag da(B-V) Deviation from cluster line (Δa)
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Notation for stars sorted after X and Y 5- 7 I3 --- CP ? Notation according to Carraro & Patat (2001A&A...379..136C) Cl* NGC 3114 CP NNNN in Simbad 9- 11 I3 --- JM ? Notation according to Jankowitz & McCosh (1963MNSSA..22...18J), NGC 3114 NNN in Simbad 13- 17 F5.1 pix Xpos X-coordinate on CCD 19- 23 F5.1 pix Ypos Y-coordinate on CCD 25- 30 F6.3 mag Vmag Mean V value 32- 36 F5.3 mag a Mean a index (a = g2 - [(g1+y)/2]) 38- 42 F5.3 mag e_a Sigma a 44- 49 F6.3 mag g1-y Mean (g1-y) index 51- 55 F5.3 mag e_g1-y Sigma (g1-y) 57- 62 F6.3 mag da(g1-y) Deviation from cluster line (Δa)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Notation for stars sorted after X and Y 5- 7 I3 --- KF ? Notation according to Kjeldsen & Frandsen (1991A&AS...87..119K) Cl* NGC 6204 KF NNN in Simbad 9- 13 F5.1 pix Xpos X-coordinate on CCD 15- 19 F5.1 pix Ypos Y-coordinate on CCD 21- 26 F6.3 mag Vmag Mean V value 28- 32 F5.3 mag a Mean a index (a = g2 - [(g1+y)/2]) 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- 58 F6.3 mag da(g1-y) Deviation from cluster line (Δa) 60- 64 F5.3 mag B-V ? (B-V) from the literature 66- 71 F6.3 mag da(B-V) ? Deviation from cluster line (Δa) 73- 74 I2 --- Obs Number of observations
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Notation for stars sorted after X and Y 5- 8 I4 --- SBL ? Notation according to Sung et al. (1999MNRAS.310..982S) Cl* NGC 6705 SBL NNNNNN in Simbad 10- 13 I4 --- WEBDA ? Notation according to WEBDA 15- 20 F6.1 pix Xpos X-coordinate on CCD 22- 26 F5.1 pix Ypos Y-coordinate on CCD 28- 33 F6.3 mag Vmag Mean V value 35- 39 F5.3 mag a Mean a index (a = g2 - [(g1+y)/2]) 41- 45 F5.3 mag e_a Sigma a 47- 52 F6.3 mag g1-y Mean (g1-y) index 54- 58 F5.3 mag e_g1-y Sigma (g1-y) 60- 65 F6.3 mag da(g1-y) Deviation from cluster line (Δa) 67- 71 F5.3 mag B-V ? (B-V) from the literature 73- 78 F6.3 mag da(B-V) ? Deviation from cluster line (Δa) 80- 81 I2 --- Obs Number of observations
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Notation for stars sorted after X and Y 4- 5 I2 --- WEBDA ? Notation according to WEBDA 7- 12 F6.1 pix Xpos X-coordinate on CCD 14- 19 F6.1 pix Ypos Y-coordinate on CCD 21- 26 F6.3 mag Vmag Mean V value 28- 32 F5.3 mag a ? Mean a index (a = g2 - [(g1+y)/2]) 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- 58 F6.3 mag da(g1-y) ? Deviation from cluster line (Δa) 60- 64 F5.3 mag b-y ? (b-y) from the literature 66- 71 F6.3 mag da(b-y) ? Deviation from cluster line (Δa) 73- 74 I2 --- Obs Number of observations
Acknowledgements: 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 Paunzen et al., Paper IV 2002A&A...395..823P, Cat. J/A+A/395/823
(End) E. Paunzen [IfA, Vienna], Patricia Bauer [CDS] 13-Jan-2004
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