J/AJ/130/1916 Metallicity indices in open clusters (Marshall+, 2005)
Survey for transiting extrasolar planets in stellar systems.
II. Spectrophotometry and metallicities of open clusters.
Marshall J.L., Burke C.J., Depoy D.L., Gould A., Kollmeier J.A.
<Astron. J., 130, 1916-1928 (2005)>
=2005AJ....130.1916M 2005AJ....130.1916M
ADC_Keywords: Abundances ; Clusters, open
Keywords: Galaxy: abundances - Galaxy: kinematics and dynamics -
open clusters and associations: general - stars: abundances
Abstract:
We present metallicity estimates for seven open clusters based on
spectrophotometric indices from moderate-resolution spectroscopy.
Observations of field giants of known metallicity provide a
correlation between the spectroscopic indices and the metallicity of
open cluster giants. We use 2 analysis to fit the relation of
spectrophotometric indices to metallicity in field giants. The
resulting function allows an estimate of the target-cluster giants'
metallicities with an error in the method of ±0.08 dex. We derive
the following metallicities for the seven open clusters: NGC 1245,
[M/H]=-0.14±0.04; NGC 2099, [M/H]=+0.05±0.05; NGC 2324,
[M/H]=-0.06±0.04; NGC 2539, [M/H]=-0.04±0.03; NGC 2682 (M67),
[M/H]=-0.05±0.02; NGC 6705, [M/H]=+0.14±0.08; NGC 6819,
[M/H]=-0.07±0.12. These metallicity estimates will be useful in
planning future extrasolar planet transit searches, since planets may
form more readily in metal-rich environments.
Description:
The spectral data were obtained at the MDM Observatory using the
Boller & Chivens CCD Spectrograph (CCDS). We obtained one night of
data (2002 January 31) on the 2.4m Hiltner Telescope, while the other
seven nights of data (during 2002 March 21-April 1) were obtained on
the 1.3m McGraw-Hill Telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 104 56 Metallicity indices for calibration stars
table3.dat 104 35 Metallicity indices for target-cluster stars
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See also:
J/A+A/376/561 : Rc light curves of 7 variables in M37 (Kiss+, 2001)
J/A+A/307/80 : Velocities of red giants in NGC 2099 (Mermilliod+ 1996)
J/A+A/418/979 : VI and CT1 photometry in NGC 2324 field (Piatti+, 2004)
J/A+A/361/945 : UBV photometry in open cluster NGC 2539 (Lapasset+, 2000)
J/AJ/106/181 : CCD photometry of open cluster M67 (Montgomery+ 1993)
III/221 : Catalogue of [Fe/H] of F, G, K stars (Cayrel de Strobel+ 2001)
WEBDA : http://www.univie.ac.at/webda/navigation.html
Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Star name (1)
15- 24 A10 "M/D/Y" ObsDate Date of the observation
26- 30 F5.3 mag (B-V)0 The (B-V)0 color index (2)
32- 38 F7.4 [Sun] [Fe/H] ? Metallicity (only in table2.dat) (3)
40- 44 F5.3 --- Ca4226 The Ca4226 index (4)
46- 50 F5.3 --- CN4216 The CN4216 index (4)
52- 56 F5.3 --- Fe4065 The Fe4065 index (4)
58- 62 F5.3 --- Fe4530 The Fe4530 index (4)
64- 68 F5.3 --- Fe4680 The Fe4680 index (4)
70- 74 F5.3 --- Fe4920 The Fe4920 index (4)
76- 80 F5.3 --- Fe5011 The Fe5011 index (4)
82- 86 F5.3 --- Fe5270 The Fe5270 index (4)
88- 92 F5.3 --- Fe5335 The Fe5335 index (4)
94- 98 F5.3 --- Gband The Gband index (4)
100-104 F5.3 --- Mg The Mg index (4)
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Note (1): Identifications as given in the WEBDA database.
Note (2): For table2.dat only: colors taken from the Hipparcos Catalog ESA
(1997, Cat. I/239).
For table3.dat only: Sources for photometry and reddening:
NGC 1245: (B-V) and E(B-V)=0.25 from Burke et al. (2004AJ....127.2382B 2004AJ....127.2382B);
NGC 2099: (B-V) from Kiss et al. (2001, Cat. J/A+A/376/561) (via WEBDA),
E(B-V)=0.29 Mermilliod et al.(1996, Cat. J/A+A/307/80);
NGC 2324: (B-V) from Kyeong et al. (2001JKAS...34..143K 2001JKAS...34..143K) (via WEBDA),
E(B-V)=0.25 Piatti et al. (2004, Cat. J/A+A/418/979);
NGC 2539: (B-V) and E(B-V)=0.06 from Lapasset et al. (2000,
Cat. J/A+A/361/945);
NGC 2682: (B-V) and E(B-V)=0.05 from Montgomery et al. (1993,
Cat. J/AJ/106/181);
NGC 6705: (B-V) from Stetson (2000PASP..112..925S 2000PASP..112..925S) (via WEBDA),
E(B-V)=0.43 Sung et al. (1999MNRAS.310..982S 1999MNRAS.310..982S)
NGC 6819: (B-V) and E(B-V)=0.16 from Rosvick & Vandenberg
(1998AJ....115.1516R 1998AJ....115.1516R) ((B-V) via WEBDA).
Note (3): Metallicities derived from Cayrel de Strobel et al. (2001,
Cat. III/221), as described in Section 3.
Note (4): Indexes use the following bandpasses (see table 1 of the
paper for a more accurate definition):
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Index Bandpass(Å) Species measured
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Fe4065 4033.50-4085.00 FeI, MnI, SrII
CN4216 4144.00-4175.75 CN
Ca4226 4207.00-4245.00 CaI
Gband 4245.00-4320.00 CH, FeI
Fe4530 4520.00-4571.25 FeI, TiI, TiII
Fe4680 4636.00-4723.00 FeI, CrI, NiI, MgI
Fe4920 4900.00-4940.00 FeI
Fe5011 4976.00-5051.00 FeI, TiI, FeII, NiI
Mg 5130.00-5200.00 Mgb + MbH
Fe5270 5248.00-5286.75 FeI, CaI
Fe5335 5314.75-5353.50 FeI, CrI
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History:
From electronic version of the journal
References:
Burke et al., Paper I 2004AJ....127.2382B 2004AJ....127.2382B
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 20-Feb-2006