J/A+A/485/571 Metallicities & activities of southern stars (Jenkins+, 2008)
Metallicities and activities of southern stars.
Jenkins J.S., Jones, H.R.A., Pavlenko Y., Pinfield D.J., Barnes J.R.,
Lyubchik Y.
<Astron. Astrophys. 485, 571 (2008)>
=2008A&A...485..571J 2008A&A...485..571J
ADC_Keywords: Stars, nearby ; Photometry, UBV ; Abundances, [Fe/H] ;
Spectroscopy
Keywords: stars: abundances - stars: activity - stars: atmospheres -
stars: planetary systems
Abstract:
We present the results from high-resolution spectroscopic measurements
to determine metallicities and activities of bright stars in the
southern hemisphere.
Description:
This table comprises a list of stellar metallicities and activities
for a number of solar-type stars in the southern hemisphere using
high-resolution (R∼46000) spectra acquired at the ESO-MPI 2.2m
telescope and the instrument FEROS. The stars all have B-V colours in
the range 0.5-0.9, V magnitudes between 7.5-9.5 and were selected from
the Hipparcos catalogue (Perryman et al., 1997, Cat. I/239). The
chromospheric activities along with their photon counting errors are
shown, and were extracted by comparing the flux in triangular
bandpasses centred in the cores of the Calcium II H and K lines
(wavelengths of 3933.664Å and 3968.470Å) against the flux in two
square bandpass regions centred on the continuum at either side of
these lines (wavelengths of 3891Å and 4001Å). These values have
been calibrated onto the Mt. Wilson system of measurements (Duncan et
al., 1991, Cat. III/159) and then converted to the commonly used
logRhk system (Noyes et al. 1984ApJ...287..769N 1984ApJ...287..769N) to remove
the photospheric component of the flux. The metallicities shown in
column 6, were measured by comparing a grid of synthetic spectra
(WITA6; Pavlenko et al., 1995A&A...303..807P 1995A&A...303..807P) to a number of mostly
weak and unblended FeI lines at this spectral resolution. The internal
errors were determined by fitting the Chi-squared parabola and after
comparison with other works these values were found to agree to
<0.1dex or 0.05dex with other high-resolution spectral abundances
(e.g. Valenti & Fischer, 2005, Cat. J/ApJS/159/141). The tail of
objects with really high errors were mainly lower S/N spectra due to
changing weather patterns.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 49 322 Metallicities and chromospheric activities of
all stars in this sample
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
III/159 : Ca II H and K Measurements Made at MWO (Duncan+ 1991)
J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- HD/HIP HD or HIP designation of the star
11- 15 F5.3 mag B-V Hipparcos B-V colour index
17- 20 F4.2 mag Vmag Hipparcos V magnitude
22- 26 F5.3 --- S Mount Wilson activity S-index
28- 32 F5.3 --- 1sigma Photon counting errors (i.e. root-N noise)
34- 38 F5.2 --- logRhk Non-photometric activity index
40- 44 F5.2 [Sun] [Fe/H] Metallicity
46- 49 F4.2 [Sun] e_[Fe/H] 1 sigma Chi-squared error
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Acknowledgements:
James Jenkins, jjenkins(at)astro.psu.edu
(End) Patricia Vannier [CDS] 21-Apr-2008