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J/ApJ/836/168  Abundances & RVs for stars near (or in) NGC6273  (Johnson+, 2017)

A chemical composition survey of the iron-complex globular cluster NGC 6273 (M19). Johnson C.I., Caldwell N., Rich R.M., Mateo M., Bailey III J.I., Clarkson W.I., Olszewski E.W., Walker M.G. <Astrophys. J., 836, 168-168 (2017)> =2017ApJ...836..168J (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Abundances ; Stars, giant ; Radial velocities ; Equivalent widths ; Photometry, infrared Keywords: globular clusters: general; globular clusters: individual: (NGC 6273, M19); stars: abundances Abstract: Recent observations have shown that a growing number of the most massive Galactic globular clusters contain multiple populations of stars with different [Fe/H] and neutron-capture element abundances. NGC 6273 has only recently been recognized as a member of this "iron-complex" cluster class, and we provide here a chemical and kinematic analysis of >300 red giant branch and asymptotic giant branch member stars using high-resolution spectra obtained with the Magellan-M2FS and VLT-FLAMES instruments. Multiple lines of evidence indicate that NGC 6273 possesses an intrinsic metallicity spread that ranges from about [Fe/H]=-2 to -1 dex, and may include at least three populations with different [Fe/H] values. The three populations identified here contain separate first (Na/Al-poor) and second (Na/Al-rich) generation stars, but a Mg-Al anti-correlation may only be present in stars with [Fe/H]≳-1.65. The strong correlation between [La/Eu] and [Fe/H] suggests that the s-process must have dominated the heavy element enrichment at higher metallicities. A small group of stars with low [α/Fe] is identified and may have been accreted from a former surrounding field star population. The cluster's large abundance variations are coupled with a complex, extended, and multimodal blue horizontal branch (HB). The HB morphology and chemical abundances suggest that NGC 6273 may have an origin that is similar to ω Cen and M54. Description: In order to efficiently obtain a large number of high-resolution spectra, we employed the Michigan/Magellan Fiber System (M2FS) and MSpec multi-object spectrograph mounted on the Magellan-Clay 6.5m telescope (R∼27000). We supplemented the M2FS CaT data set with additional observations of 300 RGB stars taken with the VLT FLAMES-GIRAFFE instrument. The data were downloaded from the European Southern Observatory (ESO) Science Archive Facility (R∼18000 from 8482 to 9000Å). In support of our spectroscopic observations, we have obtained new HST Wide Field Camera 3 UVIS channel (WFC3/UVIS) data centered on NGC 6273 that includes the F336W, F438W, F555W, and F814W filters. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 66 18 Observing log table2.dat 69 333 Star identifiers, coordinates, photometry, and radial velocities for NGC 6273 members table3.dat 69 515 Star identifiers, coordinates, photometry, and radial velocities for non-members table4.dat 39 59 Model atmosphere parameters for NGC 6273 members table5.dat 82 59 Chemical abundances for NGC 6273 members: Na-Cr table6.dat 73 59 Chemical abundances for NGC 6273 members: Fe-Eu table7.dat 51 274 Calcium triplet metallicity data
See also: B/eso : ESO Science Archive Catalog (ESO, 1991-2016) VII/195 : Globular Clusters in the Milky Way (Harris, 1996) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) V/150 : Updated catalog of variable stars in GCs (Clement+ 2017) J/AJ/112/545 : Proton capture chains in GCs. I. (Pilachowski+ 1996) J/PASP/109/883 : Globular metallicity scale. I. (Rutledge+ 1997) J/A+A/391/945 : HST photometry of 74 galactic GCs (Piotto+, 2002) J/AJ/130/2140 : Abundances & velocities in globular clusters (Pritzl+, 2005) J/AJ/134/1298 : CaII equivalent widths in 29 GCs (Carrera+, 2007) J/AJ/133/1287 : JHK photom. of 24 Galactic globular clusters (Valenti+, 2007) J/MNRAS/383/183 : CaII triplet of RGB from VLT/FLAMES obs. (Battaglia+, 2008) J/A+A/486/177 : Bulge field stars from FLAMES-GIRAFFE sp. (Zoccali+, 2008) J/A+A/505/139 : Abundances of red giants in 17 GCs (Carretta+, 2009) J/A+A/505/117 : Abundances of red giants in 15 GCs (Carretta+, 2009) J/ApJ/705/1481 : Spectrosc. of stars in 6 globular clusters (Da Costa+, 2009) J/MNRAS/404/1529 : s-process in low-metallicity stars (Bisterzo+, 2010) J/AJ/143/70 : Differential reddening in MW globulars (Alonso-Garcia+, 2012) J/A+A/540/A27 : Spectroscopy in Galactic globular clusters (Saviane+, 2012) J/A+A/549/A147 : Microlensed bulge dwarf star abundances. V. (Bensby+, 2013) J/other/Nat/498.198 : Na abundances in NGC6752 (Campbell+, 2013) J/MNRAS/434/1681 : Extremely metal-poor stars CaII triplet (Carrera+, 2013) J/ApJ/769/40 : Potassium abundance in red giants of GCs (Carretta+, 2013) J/ApJ/765/157 : Red giant abundances in the Galactic bulge (Johnson+, 2013) J/A+A/563/A76 : CaII triplet equivalent widths in 30 globulars (Mauro+, 2014) J/A+A/562/A66 : GIRAFFE Inner Bulge Survey (GIBS). I. (Zoccali+, 2014) J/AJ/149/53 : RVs of 12 Milky Way globular clusters (Kimmig+, 2015) J/A+A/573/A115 : Radial velocities in seven globular clusters (Lardo+, 2015) J/ApJS/219/7 : Ca,by photometry in globular clusters. I. M22 (Lee, 2015) J/ApJS/216/19 : Spectroscopic HK' index for 3 globular clusters (Lim+, 2015) J/AJ/149/153 : Abundances of red giants in 10 GCs (Meszaros+, 2015) J/A+A/580/A121 : CaT/[Fe/H] for Galactic bulge stars (Vasquez+, 2015) J/MNRAS/455/199 : CaII triplet in red giant spectra (Da Costa, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 A1 --- Obs Observation (P=Photometry; S=Spectroscopy) 3- 4 A2 --- Field Field (1) 6- 18 A13 --- Tel Telescope/Instrument 20- 28 A9 --- Setup Instrument setup 30- 43 A14 "Y/M/D" Date UT Date of Observation 45- 66 A22 s Exp Exposure sequence(s)
Note (1): Fields with different designations indicate different telescope pointings. The "a" and "b" designations for the VLT--FLAMES setups correspond to the "HIERARCH ESO OBS NAME" keyword in the original image headers. The "a" and "b" fields with the same numbers typically observed the same stars, but sometimes with different fibers.
Byte-by-byte Description of file: table[23].dat
Bytes Format Units Label Explanations
1 I1 --- Set Sample (G1) 3- 18 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000) 20 A1 --- f_2MASS Observation notes (G2) 22- 31 F10.6 deg RAdeg Right Ascension, decimal degrees (J2000) (1) 33- 42 F10.6 deg DEdeg Declination, decimal degrees (J2000) (1) 44- 49 F6.3 mag Jmag [10.3/16.2] 2MASS J magnitude (1) 51- 56 F6.3 mag Ksmag [9.3/16.5] 2MASS Ks magnitude (1) 58- 64 F7.2 km/s HRV [-351/347] Heliocentric radial velocity (range between ∼120-165km/s for the members) 66- 69 F4.2 km/s e_HRV [0.1/6] Uncertainty in HRV
Note (1): Source positions and J, Ks magnitudes taken from 2MASS.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000) 18 A1 --- n_2MASS [abd] Observation notes (G2) 20- 23 I4 K Teff [4200/4900]? Effective temperature 25- 28 F4.2 cm/s2 log(g) [0.2/2.4]? Surface gravity 30- 34 F5.2 [Sun] [Fe/H] [-2/-1]? Metallicity 36- 39 F4.2 km/s xi [1.3/2.3]? Microturbulent velocity
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000) 18 A1 --- f_2MASS [a-c] Observation notes (G2) 20- 24 F5.2 [-] [NaI/Fe] [-0.2/0.7]? [NaI/Fe] abundance 26- 29 F4.2 [-] e_[NaI/Fe] ? Uncertainty for [NaI/Fe] 31- 34 F4.2 [-] [MgI/Fe] [0.2/0.6]? [MgI/Fe] abundance 36- 39 F4.2 [-] e_[MgI/Fe] ? Uncertainty for [MgI/Fe] 41- 44 F4.2 [-] [AlI/Fe] [0.1/1.3]? [AlI/Fe] abundance 46- 49 F4.2 [-] e_[AlI/Fe] ? Uncertainty for [AlI/Fe] 51- 55 F5.2 [-] [SiI/Fe] [-0.2/0.6]? [SiI/Fe] abundance 57- 60 F4.2 [-] e_[SiI/Fe] ? Uncertainty for [SiI/Fe] 62- 66 F5.2 [-] [CaI/Fe] [-0.07/0.5]? [CaI/Fe] abundance 68- 71 F4.2 [-] e_[CaI/Fe] ? Uncertainty for [CaI/Fe] 73- 77 F5.2 [-] [CrI/Fe] [-0.2/0.3]? [CrI/Fe] abundance 79- 82 F4.2 [-] e_[CrI/Fe] ? Uncertainty for [CrI/Fe]
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000) 18 A1 --- f_2MASS [a-c] Observation notes (G2) 20- 24 F5.2 [Sun] [FeI/H] [-2.1/-1]? [FeI/H] abundance 26- 29 F4.2 [Sun] e_[FeI/H] ? Uncertainty in [FeI/H] 31- 35 F5.2 [Sun] [FeII/H] [-2/-1.1]? [FeII/H] abundance 37- 40 F4.2 [Sun] e_[FeII/H] ? Uncertainty in [FeII/H] 42- 47 F6.3 [Sun] [NiI/Fe] [-0.4/0.2]? [NiI/Fe] abundance 49- 52 F4.2 [Sun] e_[NiI/Fe] ? Uncertainty in [NiI/Fe] 54- 58 F5.2 [Sun] [LaII/Fe] [-0.4/1.2]? [LaII/Fe] abundance 60- 63 F4.2 [Sun] e_[LaII/Fe] ? Uncertainty in [LaII/Fe] 65- 68 F4.2 [Sun] [EuII/Fe] [0.1/0.8]? [EuII/Fe] abundance 70- 73 F4.2 [Sun] e_[EuII/Fe] ? Uncertainty in [EuII/Fe]
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1 I1 --- Set Sample (G1) 3- 18 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000) 20 A1 --- f_2MASS Observation notes (G2) 22- 25 F4.2 0.1nm W(8542) [1.5/4]? Equivalent width of CaIIλ8542 27- 30 F4.2 0.1nm W(8662) [1.2/3]? Equivalent width of CaIIλ8662 32- 35 F4.2 0.1nm sW [2.9/7]? Summed equivalent width 37- 40 F4.2 0.1nm rW [2.6/6]? Reduced equivalent width 42- 46 F5.2 [Sun] [Fe/H] [-2.3/-0.5]? Metallicity values derived from Calcium Triplet 48- 51 F4.2 [Sun] e_[Fe/H] [0.1/0.6]? Uncertainty in [Fe/H]
Global notes: Note (G1): Sample as follows: 1 = Bulge_GC1 Members; 2 = M2FS Calcium Triplet Members; 3 = FLAMES Calcium Triplet Members. Note (G2): Observation notes as follows: a = Observed in Johnson et al. (2015AJ....150...63J), the Bulge_GC1 setup, and the M2FS Calcium Triplet setup; b = Observed in Johnson et al. (2015AJ....150...63J) and the Bulge_GC1 setup; c = Observed in Johnson et al. (2015AJ....150...63J) and the M2FS Calcium Triplet setup; d = Observed in the Bulge_GC1 and M2FS Calcium Triplet setups; e = Observed in the M2FS Calcium Triplet and FLAMES Calcium Triplet setups.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 25-Sep-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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