J/AJ/127/1545 Abundance ratios of 4 stars in Pal 12 (Cohen+, 2004)
Palomar 12 as a part of the Sagittarius stream:
the evidence from abundance ratios.
Cohen J.G.
<Astron. J., 127, 1545-1554 (2004)>
=2004AJ....127.1545C 2004AJ....127.1545C
ADC_Keywords: Clusters, globular ; Abundances, peculiar
Keywords: globular clusters: general -
globular clusters: individual (Palomar 12) -
galaxies: individual (Sagittarius dSph) - stars: abundances
Abstract:
We present a detailed abundance analysis for 21 elements based on
high-dispersion, high spectral resolution Keck spectra for four
members of the outer halo "young" Galactic globular cluster
Palomar 12. All four stars show identical abundance distributions with
no credible indication of any star-to-star scatter. However, the
abundance ratios of the Pal 12 stars are very peculiar.
Description:
All spectra were obtained with HIRES at the Keck Observatory
in June and August 2003.
Objects:
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RA (2000) DE Designation(s)
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21 46 38.8 -21 15 03 Pal 12
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 41 311 Equivalent Widths for Palomar 12 Stars
table4.dat 67 23 Derived abundances for Palomar 12
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See also:
J/AJ/97/1360 : BV photometry of Palomar 12 (Stetson+ 1989)
Table 1: Stellar parameters for the Palomar 12 sample.
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Name Teff logg Vt Vmag RV
K dex km/s mag km/s
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S1 3900 0.63 1.8 14.57 28.8
1118 4000 0.84 1.8 14.84 30.0
1128 4260 1.30 1.7 15.43 28.1
1305 4465 1.62 1.7 15.86 28.8
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Ion Ion name
6- 12 F7.2 0.1nm Lambda Wavelength in angstroms
14- 17 F4.2 eV ExPot Excitation potential
19- 24 F6.2 [---] log(gf) Logarithm of the oscillator strength
26- 28 I3 10-13m EW(S1) ? Cl* Palomar 12 HC 1 equivalent width
30- 32 I3 10-13m EW(1118) ? Cl* Palomar 12 HC 1118 equivalent width
34- 36 I3 10-13m EW(1128) ? Cl* Palomar 12 HC 1128 equivalent width
38- 40 I3 10-13m EW(1305) ? Cl* Palomar 12 HC 1305 equivalent width
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Ion Ion
7 A1 --- n_[X/Fe](S1) [b] b: For Fe I only,
we give [Fe/H] in [X/Fe]
9- 13 F5.2 --- [X/Fe](S1) Relative abundance of Cl* Palomar 12 HC 1
15- 18 F4.2 --- e_[X/Fe](S1) ?=- error on [X/Fe] (1)
20- 22 I3 --- Nlines(S1) Number of lines
24- 28 F5.2 --- [X/Fe](1118) Relative abundance of Cl* Palomar 12 HC 1118
30- 33 F4.2 --- e_[X/Fe](1118) ?=- error on [X/Fe] (1)
35- 37 I3 --- Nlines(1118) Number of lines
39- 43 F5.2 --- [X/Fe](1128) Relative abundance of Cl* Palomar 12 HC 1128
45- 48 F4.2 --- e_[X/Fe](1128) ?=- error on [X/Fe] (1)
50- 52 I3 --- Nlines(1128) Number of lines
54- 58 F5.2 --- [X/Fe](1305) Relative abundance of Cl* Palomar 12 HC 1305
60- 63 F4.2 --- e_[X/Fe](1305) ?=- error on [X/Fe] (1)
65- 67 I3 --- Nlines(1305) Number of lines
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Note (1): 1σ rms deviation of the set of abundances derived from
each of the observed absorption lines about the mean abundance.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-May-2004