J/MNRAS/393/272 Spectroscopy of red giants in 12 open clusters (Warren+, 2009) ================================================================================ Metallicities and radial velocities of five open clusters including a new candidate member of the Monoceros stream. Warren S.R., Cole A.A. =2009MNRAS.393..272W ================================================================================ ADC_Keywords: Clusters, open ; Clusters, globular ; Stars, giant ; Abundances ; Radial velocities Keywords: techniques: spectroscopic - stars: abundances - stars: late-type - globular clusters - general; open clusters and associations: general Abstract: Near-infrared spectra of 133 red giant stars from 10 Galactic open clusters and two Galactic globular clusters spanning 2.2dex in metallicity and 11Gyr in age are presented. We combine this sample with 10 clusters from Cole and collaborators (2004MNRAS.347..367C) to investigate the CaII triplet line strengths and their relation to cluster metallicity and position along the red giant branch. We show that characterizing the stellar surface gravity using K_s_-band photometry (relative to the horizontal branch) taken from the Two Micron All-Sky Survey allows for metallicity measurements at least as precise as those derived using V- or I-band data. This has the great advantage that uniform photometry and reliable astrometry are available for a large number of clusters. Using K_s_-band photometry also reduces the effect of differential reddening within a given cluster. We find no significant evidence for age or metallicity effects to the linear CaII triplet-metallicity relationship over the small range in magnitudes studied when homogeneous reference metallicities are used. We derive the first spectroscopic metallicity and new radial velocity estimates for five open clusters: Berkeley 81, Berkeley 99, IC 1311, King 2 and NGC7044. King2 has an anomalous radial velocity compared with the local disc population. We discuss the possibility that it is part of the Monoceros tidal stream. Description: We observed a sample of 10 Galactic open clusters and two Galactic globular clusters with the multifibre spectrograph at the William Herschel Telescope on La Palma. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file clusters.dat 72 22 List of studied clusters tables3.dat 68 473 Sample of cluster giants and derived parameters -------------------------------------------------------------------------------- See also: J/A+AS/121/95 : Giant stars abundances in 24 clusters (Carretta+ 1997) J/MNRAS/299/1 : BVI photometry in four open clusters (Sagar+, 1998) Byte-by-byte Description of file: clusters.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 11 A11 --- Cluster Cluster name 14- 15 I2 h RAh Right ascension (J2000) (1) 17- 18 I2 min RAm Right ascension (J2000) (1) 20- 23 F4.1 s RAs Right ascension (J2000) (1) 25 A1 --- DE- Declination sign (J2000) (1) 26- 27 I2 deg DEd Declination (J2000) (1) 29- 30 I2 arcmin DEm Declination (J2000) (1) 32- 35 F4.1 arcsec DEs ? Declination (J2000) (1) 37- 41 F5.2 [Sun] [Fe/H] [-2.2/0.2]? Metallicity 43- 46 F4.2 [Sun] e_[Fe/H] [0.01/0.14]? rms uncertainty on [Fe/H] 48- 50 F3.1 kpc Dist [3/6.5]? Distance of cluster 52- 55 F4.1 Gyr Age [1/13] Cluster age 57- 61 F5.2 mag Ksmag Ks magnitude of red clump (RC) 63- 66 F4.2 mag e_Ksmag rms uncertainty on Ksmag 68- 70 A3 --- Ref References (2) 72 A1 --- C04 [*] * for Cole et al. (2004MNRAS.347..367C) clusters -------------------------------------------------------------------------------- Note (1): Center of AF2/WYFFOS field. Note (2): References to metallicity and age values as follows 1 = Carretta & Gratton (1997A&AS..121...95C, Cat. J/A+AS/121/95) 2 = Salaris & Weiss (2002A&A...388..492S) 3 = Friel et al. (2002AJ....124.2693F) 4 = Salaris et al. (2004A&A...414..163S) 5 = Sagar & Griffiths (1998MNRAS.299....1S, Cat. J/MNRAS/299/1) 6 = Delgado et al. (1994AJ....108.2193D) 7 = Kaluzny (1989AcA....39...13K) -------------------------------------------------------------------------------- Byte-by-byte Description of file: tables3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 11 A11 --- Cluster Cluster name 13- 28 A16 --- 2MASS 2MASS ID (HHMMSSss+DDMMSSs) 30- 34 F5.2 mag Ksmag [5.1/13.3] 2MASS Ks magnitude 36- 39 F4.2 mag e_Ksmag [0.01/0.05] rms uncertainty on Ksmag 41- 47 F7.2 km/s RV [-723/619] Radial velocity 49- 52 F4.2 km/s e_RV [0.01/5.32] rms uncertainty on RV 54- 58 F5.2 0.1nm SW(CaT) [-1.2/15] Calcium Triplet index (1) 60- 64 F5.2 0.1nm e_SW(CaT) [0.14/12] rms uncertainty on SW(CaT) 66- 68 A3 --- Notes Notes, 1=accepted star member (2) -------------------------------------------------------------------------------- Note (1): The CaT index is taken as a linear combination of the pseudo-equivalent widths of the three CaII lines ({lambda}{lambda}=8498.02, 8542.09, 8662.14{AA}). Note (2): Notes as follows 1 = accepted stars 2 = radial velocity template 3 = radial velocity outlier or falling beyond the visual cluster bounds (see text) 4 = TiO bands 5 = CN bands 6 = low quality spectra -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 08-Jun-2015