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J/A+A/303/468 Spectrospcopy, IR-photom. in globular clusters (Minniti, 1995)
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Spectroscopy and IR photometry for giant stars in obscured globular clusters:
NGC 6325, NGC 6401, NGC 6517, NGC 6642, HP 1 and Pal 6.
Minniti D.
<Astron. Astrophys. 303, 468 (1995)>
=1995A&A...303..468M (SIMBAD/NED BibCode)
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ADC_Keywords: Photometry, infrared ; Radial velocities ; Spectroscopy
Keywords: Stars: abundances - Stars: velocities - Galaxy: globular clusters
Description (Abstract):
We have obtained spectra of 85 giants selected from IR photometry in
the fields of several very reddened galactic clusters. Radial
velocities are measured to check membership. We measure the strength
of several Fe and Mg spectral feature s, presenting a new calibration
of metallicity based on the location of the giants in the
Mg+Fe5270+Fe5335 vs (J-K)_0_ diagram. Using this calibration we compute
accurate mean metallicities for the clusters studied. Reddening
values which better fit the spectroscopic and photometric data are
also derived. Pal 6 turns out to be the most metal rich cluster of our
sample, with [Fe/H]=0.2+/-0.3.
Objects:
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RA (2000) DE Name(s)
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18 36.4 -23 55 M22, NGC 6656
17 18.0 -23 45 NGC 6325
17 23.6 -17 49 NGC 6356
17 38.6 -23 55 NGC 6401
17 48.9 -20 22 NGC 6440
18 01.8 -08 57 NGC 6517
18 31.8 -23 28 NGC 6642
17 31 05 -29 59.1 HP 1 (Haute-Provence 1), C 1727-299
17 43 42 -26 13.4 Pal 6
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 90 84 Colors, velocities and spectral indices
table3.tex 140 146 LaTeX version of table3
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Byte-per-Byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 5 A5 --- Cluster Cluster name
8- 10 A3 --- Star Star name
13- 16 F4.2 mag J-K ? Measured J-K colour
18- 23 F6.1 km/s RV ? Measured heliocentric radial velocity
25- 28 F4.2 --- Mg Mg spectroscopic index (1)
33- 36 F4.2 --- Hbeta Hbeta spectroscopic index (1)
38- 41 F4.2 --- Fe492 Fe492 spectroscopic index (1)
43- 46 F4.2 --- Fe498 Fe498 spectroscopic index (1)
49- 52 F4.2 --- Fe501 Fe501 spectroscopic index (1)
55- 58 F4.2 --- Fe527 Fe527 spectroscopic index (1)
61- 64 F4.2 --- Fe533 Fe533 spectroscopic index (1)
67- 70 F4.2 --- Fe540 Fe540 spectroscopic index (1)
72- 75 F4.2 --- Mg1 Mg1 spectroscopic index (1)
77- 80 F4.2 --- Mg2 Mg2 spectroscopic index (1)
82- 85 F4.2 --- Mgb Mgb spectroscopic index (1)
87- 90 F4.2 --- MgH MgH spectroscopic index (1)
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Note (1): The definition of the indices are in Friel E.D., 1987, AJ 93, 1388
=1987AJ.....93.1388F
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Courtesy: Dante Minniti <dminniti@eso.org>
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(End) Patricia Bauer [CDS] 02-Feb-1996