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 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:
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RA (2000) DE Designation(s) (File)
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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)
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File Summary:
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FileName Lrecl Records Explanations
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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
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See also:
GCPD/75 : Maitzen (1976A&A....51..223M 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
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Cluster Site Date #N #g1 #g2 #y
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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
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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- 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)
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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- 3 I3 --- Seq Notation for stars sorted after X and Y
5- 7 I3 --- CP ? Notation according to Carraro & Patat
(2001A&A...379..136C 2001A&A...379..136C)
Cl* NGC 3114 CP NNNN in Simbad
9- 11 I3 --- JM ? Notation according to Jankowitz & McCosh
(1963MNSSA..22...18J 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)
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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 Notation for stars sorted after X and Y
5- 7 I3 --- KF ? Notation according to Kjeldsen & Frandsen
(1991A&AS...87..119K 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
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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- 3 I3 --- Seq Notation for stars sorted after X and Y
5- 8 I4 --- SBL ? Notation according to Sung et al.
(1999MNRAS.310..982S 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
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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- 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
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Acknowledgements:
References:
Bayer et al., Paper I 2000A&AS..147...99B 2000A&AS..147...99B
Paunzen & Maitzen, Paper II 2001A&A...373..153P 2001A&A...373..153P, Cat. J/A+A/373/153
Paunzen & Maitzen, Paper III 2002A&A...385..867P 2002A&A...385..867P, Cat. J/A+A/385/867
Paunzen et al., Paper IV 2002A&A...395..823P 2002A&A...395..823P, Cat. J/A+A/395/823
(End) E. Paunzen [IfA, Vienna], Patricia Bauer [CDS] 13-Jan-2004