J/A+A/449/723 Abundances in atmospheres of stars with planets (Gilli+, 2006)
Abundances of refractory elements in the atmospheres of stars
with extrasolar planets.
Gilli G., Israelian G., Ecuvillon A., Santos N.C., Mayor M.
<Astron. Astrophys. 449, 723 (2006)>
=2006A&A...449..723G 2006A&A...449..723G
ADC_Keywords: Stars, nearby ; Planets ; Stars, atmospheres ;
Abundances, peculiar
Keywords: stars: abundances - stars: fundamental parameters -
stars: low-mass, brown dwarfs - stars: planetary systems -
Galaxy: solar neighbourhood - Galaxy: abundances
Abstract:
We present a uniform and homogeneous study of the abundances of Si,
Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Na, Mg and Al in 100 stars with and
94 without known planetary companions. The main purpose of this work
is to make a deep investigation of the abundance of refractory
elements, using an enlarged set of data which includes new
observations, especially for the sample of stars without known
planets. The new comparison sample spans metallicity range
-0.70<[Fe/H]<0.50 and fills the gap that previously existed, mainly at
high metallicities, in the number of field "single" comparison stars.
Furthermore, we improved the line list previously studied by other
authors: on average we analysed 90 spectral lines in every spectrum
and carefully measured more than 16 600 equivalent widths (EW) to
calculate the abundances. We investigate possible differences between
the chemical abundances of the two groups of stars, with and without
planets. The results are globally comparable to those obtained by
other authors, and in most cases the abundance trends of planet-host
stars are very similar to those of the comparison sample. This work
represents a step towards the comprehension of recently discovered
planetary systems. These results could also be useful for verifying
galactic models at high metallicities and consequently improve our
knowledge of stellar nucleosynthesis and galactic chemical evolution.
Description:
We present 16600 equivalent widths (EWs) in the spectra of 100 and 94
stars with and without known planets, respectively. We have measured
line-by-line EWs of about 80 spectral lines for the refractory
elements Si, Ca, Sc, Ti, V, Cr, Mn, Co, Ni. The EWs of about 14 lines
of Na, Mg and Al in 53 new comparison spectra have been added to the
previous analysis by Beirao et al. (2005A&A...438..251B 2005A&A...438..251B). For each
spectral a Gaussian fit was performed using the "splot" task within
the "echelle" IRAF package. In order to measure automatically the EWs
of Na, Mg and Al lines in the new spectra, we employed a new program
(IRAF scripts) written by N.C. Santos (Santos et al.,
2005A&A...437.1127S 2005A&A...437.1127S). Each measurement was taken carefully achieving
the best agreement between line profiles and Gaussian fits.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 58 194 Star positions and magnitudes (from Simbad)
planets.dat 30 9314 Equivalent widths in spectrum of planet-hosts
compar.dat 30 8742 Equivalent widths in spectrum of comparison stars
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See also:
J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)
J/A+A/384/879 : Galactic orbits of stars with planets (Barbieri+, 2002)
J/A+A/356/590 : The CORALIE survey for extrasolar planets II (Udry+, 2000)
J/A+A/375/205 : The CORALIE survey for extrasolar planets V (Naef+ 2001)
J/A+A/379/999 : The CORALIE survey for extrasolar planets VI (Santos+ 2001)
J/A+A/388/632 : The CORALIE survey for extrasolar planets VII (Pepe+, 2002)
J/A+A/390/267 : The CORALIE survey for extrasolar planets VIII (Udry+, 2002)
J/A+A/392/215 : The CORALIE survey for extrasolar planets IX (Santos+ 2002)
J/A+A/415/391 : The CORALIE survey for extrasolar planets XII (Mayor+, 2004)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD number of the star
10 A1 --- m_HD [AB] Multiplicity index on HD
14- 15 I2 h RAh Right ascension (J2000.0)
17- 18 I2 min RAm Right ascension (J2000.0)
20- 23 F4.1 s RAs Right ascension (J2000.0)
25 A1 --- DE- Declination sign (J2000.0)
26- 27 I2 deg DEd Declination (J2000.0)
29- 30 I2 arcmin DEm Declination (J2000.0)
32- 33 I2 arcsec DEs Declination (J2000.0)
37- 41 F5.2 mag Bmag ? B magnitude
43- 47 F5.2 mag Vmag ? V magnitude
49- 69 A21 --- SpType MK Spectral type
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Byte-by-byte Description of file: planets.dat compar.dat
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Bytes Format Units Label Explanations
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3- 8 I6 --- HD HD number of the star
9 A1 --- m_HD [AB] Multiplicity index on HD
12- 15 A4 --- Ion Element
17- 23 F7.2 0.1nm Lambda Wavelength in Å
26- 30 F5.1 10-4nm EW ?=-10.0 Equivalent with of line (1)
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Note (1): -10.0 if no EW measurement available.
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Acknowledgements: G. Gilli, ggilli(at)iac.es
(End) Patricia Vannier [CDS] 16-Dec-2005