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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 104 56 Metallicity indices for calibration stars table3.dat 104 35 Metallicity indices for target-cluster stars
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 : Byte-by-byte Description of file: table2.dat table3.dat
Bytes Format Units Label Explanations
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)
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); 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) (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) (via WEBDA), E(B-V)=0.43 Sung et al. (1999MNRAS.310..982S) NGC 6819: (B-V) and E(B-V)=0.16 from Rosvick & Vandenberg (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): ------------------------------------------- Index Bandpass(Å) Species measured ------------------------------------------- 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 -------------------------------------------
History: From electronic version of the journal References: Burke et al., Paper I 2004AJ....127.2382B
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 20-Feb-2006
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