J/A+A/603/L7 6 giants atomic data and equivalent widths (Mucciarelli+, 2017)
Chemical composition of the stellar cluster Gaia 1: no surprise behind Sirius.
Mucciarelli A., Monaco L., Bonifacio P., Saviane I.
<Astron. Astrophys. 603, L7 (2017)>
=2017A&A...603L...7M 2017A&A...603L...7M (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Stars, giant ; Equivalent widths
Keywords: stars: abundances - techniques: spectroscopic -
open clusters and associations: individual: Gaia1
Abstract:
We observed six He-clump stars of the intermediate-age stellar cluster
Gaia1 with the MIKE/MAGELLAN spectrograph. A possible extra-galactic
origin of this cluster, recently discovered thanks to the first data
release of the ESA Gaia mission, has been suggested, based on its
orbital parameters. Abundances for Fe, α, proton- and
neutron-capture elements have been obtained. We find no evidence of
intrinsic abundance spreads. The iron abundance is solar
([FeI/H]=+0.00±0.01; σ=0.03dex). All the other abundance
ratios are generally solar-scaled, similar to the Galactic thin disk
and open cluster stars of similar metallicity. The chemical
composition of Gaia1 does not support an extra-galactic origin for
this stellar cluster, which can be considered as a standard Galactic
open cluster.
Description:
Atomic data (wavelength, oscillator strength, excitation potential and
measured equivalent width) for all the measured spectral lines in six
giant stars of the stellar cluster Gaia1 are provided.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 94 7 Main information on the observed MIKE targets
tablea1.dat 49 1150 Atomic data and equivalent widths
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 I1 --- ID [1/7] Star identification number
3- 7 A5 --- --- [2MASS]
8- 23 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs)
25- 34 F10.6 deg RAdeg Right ascension (J2000)
36- 45 F10.6 deg DEdeg Declination (J2000)
47- 52 F6.3 mag Jmag 2MASS J magnitude
54- 59 F6.3 mag Ksmag 2MASS Ks magnitude
61- 65 F5.1 km/s RV Radial velocity (1)
67- 70 I4 K Teff ?=- Effective temperature (1)
72- 73 I2 K e_Teff ?=- rms uncertainty on Teff (1)
75- 78 F4.2 [cm/s2] logg ?=- Surface gravity (1)
80- 83 F4.2 [cm/s2] e_logg ?=- rms uncertainty on logg (1)
85- 87 F3.1 km/s Vt ?=- Microturbulent velocity (1)
89- 91 F3.1 km/s e_Vt ?=- rms uncertainty on Vt (1)
93- 94 I2 --- SNR Signal-to-noise ratio measured at 600nm
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Note (1): derived from the MIKE spectra.
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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4 I1 --- ID [1/7] Star identification number
7- 12 F6.1 0.1nm lambda Wavelength
16- 20 F5.2 --- Element Element
25- 30 F6.3 --- log(gf) Oscillator strength
35- 39 F5.3 eV Ep Excitation potential
44- 49 F6.2 0.1pm EW Measured equivalent width
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Acknowledgements:
Alessio Mucciarelli, alessio.mucciarelli2(at)unibo.it
(End) Patricia Vannier [CDS] 04-Jul-2017