J/other/RMxAA/47.309 NGC 6811 and NGC 6830 uvby-β photometry (Pena+, 2011)
uvby-β photoelectric photometry of the open clusters NGC 6811 and NGC 6830.
Pena J.H., Fox Machado L., Garcia H., Renteria A., Skinner S.,
Espinosa A.N, Romero E.
<Rev. Mex. Astron. Astrofis., 47, 309-321 (2011)>
=2011RMxAA..47..309P 2011RMxAA..47..309P
ADC_Keywords: Clusters, open ; Photometry, uvby, beta
Keywords: open clusters and associations: individual (NGC 6811, NGC 6830) -
techniques: photometric
Abstract:
From uvby-β photometry of the open clusters NGC 6811 (75 stars),
and NGC 6830 (19 stars) we were able to determine membership of the
stars to each cluster, and fix the age and reddening for each. Since
several short period stars have recently been found, we have carried
out a study of these variables.
Description:
Observations were done at the Observatorio Astronomico Nacional,
Mexico in two different seasons, those of 2009 and 2010. The 1.5m
telescope to which a spectrophotometer was attached was utilized at
all times. The first observing season was carried out over six nights
from June-July 2009. a second observing season was planned in 2010.
Objects:
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RA (2000) DE Designation(s)
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19 37 17 +46 23.3 NGC 6811 = Cl Melotte 222
19 50 59 +23 06.0 NGC 6830 = C 1948+229
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 79 79 uvby-β photoelectric photometry of the open
cluster NGC 6811
table4.dat 54 19 uvby-β photoelectric photometry of the open
cluster NGC 6830
table5.dat 68 47 Reddening, unreddened parameters and distance
for the open cluster NGC 6811
table6.dat 68 15 Reddening, unreddened parameters and distance
for the open cluster NGC 6830
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- ID WEBDA identification number (NNN and V17),
from Lindoff (1972A&A....16..315L 1972A&A....16..315L),
NGC 6811 NNN in Simbad
5- 10 F6.3 mag Vmag V magnitude
12- 16 F5.3 mag b-y b-y colour index
18- 22 F5.3 mag m1 m1 colour index
24- 28 F5.3 mag c1 c1 colour index
30- 34 F5.3 mag beta ? β index
36- 40 F5.3 mag e_Vmag ? rms uncertainty on Vmag
42- 46 F5.3 mag e_b-y ? rms uncertainty on b-y
48- 52 F5.3 mag e_m1 ? rms uncertainty on m1
54- 58 F5.3 mag e_c1 ? rms uncertainty on c1
60- 64 F5.3 mag e_beta ? rms uncertainty on beta
66- 67 I2 --- Nm Number of measurements
69- 76 A8 --- SpT Spectral type determined from
the [m1] [c1] diagram
78- 79 A2 --- SpT1 Spectral type from WEBDA
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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- 4 I4 --- ID [2/2275] WEBDA identification number
(for numbers between 2 and 164)
6- 11 F6.3 mag Vmag V magnitude
13- 17 F5.3 mag b-y b-y colour index
19- 24 F6.3 mag m1 m1 colour index
26- 31 F6.3 mag c1 c1 colour index
33- 37 F5.3 mag beta ? β index
39- 41 A3 --- SpT Spectral type determined from m1/c1 diagram
43- 47 A5 --- SpT1 Spectral type from Hoag & Applequist
(1965ApJS...12..215H 1965ApJS...12..215H), from WEBDA
49- 54 A6 --- SpT2 Spectral type from Turner
(1976AJ.....81.1125T 1976AJ.....81.1125T), from WEBDA
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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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2- 4 A3 --- ID WEDBA identification number
5 A1 --- m_ID [B] Multiplicity index on ID
7- 11 F5.3 mag E(b-y) Reddening (1)
13- 18 F6.3 mag (b-y)0 Unredenned b-y colour index
20- 24 F5.3 mag m0 Unredenned m0 index
26- 30 F5.3 mag c0 Unredenned c0 index
32- 36 F5.3 mag Hbet H{beat} value
38- 42 F5.2 mag V0mag Unredenned V magnitude
44- 48 F5.2 mag VMAG Absolute V magnitude
50- 54 F5.2 mag DM Distance modulus
56- 59 I4 pc Dist Distance
61- 65 F5.2 [Sun] [Fe/H] ? Metallicity
67- 68 A2 --- Mmb Membership code: M=member, NM=non-member,
M:=possible member
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Note (1): Mean values:
E(b-y) = 0.074±0.057mag, DM = 10.42±0.61mag, Dist = 1258±339pc,
[Fe/H] = -0.3±0.3
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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- 4 I4 --- ID [2/2275] WEDBA identification number
7- 11 F5.3 mag E(b-y) Reddening
13- 18 F6.3 mag (b-y)0 Unredenned b-y colour index
20- 24 F5.3 mag m0 Unredenned m0 index
26- 30 F5.3 mag c0 Unredenned c0 index
32- 36 F5.3 mag Hbet H{beat} value
38- 42 F5.2 mag V0mag Unredenned V magnitude
44- 48 F5.2 mag VMAG Absolute V magnitude
50- 54 F5.2 mag DM Distance modulus
56- 59 I4 pc Dist Distance
61- 65 F5.2 [Sun] [Fe/H] ? Metallicity
67- 68 A2 --- Mmb Membership code: M=member, NM=non-member,
M:=possible member
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Oct-2013