J/MNRAS/370/163 Abundance distribution of stars with planets (Bond+, 2006)
The abundance distribution of stars with planets.
Bond J.C., Tinney C.G., Butler R.P., Jones H.R.A., Marcy G.W.,
Penny A.J., Carter B.D.
<Mon. Not. R. Astron. Soc. 370, 163 (2006)>
=2006MNRAS.370..163B 2006MNRAS.370..163B
ADC_Keywords: Stars, G-type ; Planets ; Abundances, peculiar
Keywords: stars: abundances - stars: chemically peculiar - planetary system
Abstract:
We present the results of a uniform, high-precision spectroscopic
metallicity study of 136 G-type stars from the Anglo-Australian Planet
Search, 20 of which are known to harbour extrasolar planets (as at
2005 July). Abundances in Fe, C, Na, Al, Si, Ca, Ti and Ni are
presented, along with Stroemgen photometric metallicities. This study
is one of several recent studies examining the metallicities of a
sample of planet-host and non-planet-host stars that were obtained
from a single sample, and analysed in an identical manner, providing
an unbiased estimate of the metallicity trends for planet-bearing
stars. We find that non-parametric tests of the distribution of
metallicities for planet-host and non-planet-host stars are
significantly different at a level of 99.4 per cent confidence. We
confirm the previously observed trend for planet-host stars to have
higher mean metallicities than non-planet-host stars, with a mean
metallicity for planet-host stars of [Fe/H]=0.06±0.03dex compared
with [Fe/H]=0.09±0.01dex for non-host-stars in our sample. This
enrichment is also seen in the other elements studied. Based on our
findings, we suggest that this observed enhancement is more likely a
relic of the original gas cloud from which the star and its planets
formed, rather than being due to 'pollution' of the stellar
photosphere.
Description:
Spectroscopic observations of the target stars were obtained at the
3.9-m Anglo-Australian Telescope (AAT) between 1998 January and 2000
November as part of the AAPS. All of the spectra used were obtained
with the University College London Echelle Spectrograph using the
31.6lines/mm echelle grating.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 51 136 Atmospheric parameters and metallicities for
all target stars
table3.dat 100 136 Stellar abundances for all target 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/438/251 : Abundances in stars with giant planets (Beirao+, 2005)
J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)
J/A+A/449/723 : Abundances in atmospheres of stars with planets (Gilli+ 2006)
J/A+A/458/997 : Abundances for 6 transiting planet host stars (Santos+, 2006)
J/MNRAS/370/163 : Abundance distribution of stars with planets (Bond+, 2006)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Group nh: Non-host stars; ph: Planetary host stars
4- 9 I6 --- HD HD number
10 A1 --- m_HD [A] Multiplicity index on HD
12- 15 I4 K Teff Effective temperature
17- 19 I3 K e_Teff rms uncertainty on Teff
21- 24 F4.2 [cm/s2] logg Surface gravity
26- 29 F4.2 [cm/s2] e_logg rms uncertainty on logg
31- 34 F4.2 km/s Vt Microturbulence velocity
36- 40 F5.2 [Sun] [Fe/H] Spectroscopic metallicity
42- 45 F4.2 [Sun] e_[Fe/H] rms uncertainty on [Fe/H]sp
47- 51 F5.2 [Sun] [Fe/H]ph ?=- Photometric metallicity
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Group nh: Non-host stars; ph: Planetary host stars
4- 9 I6 --- HD HD number
10 A1 --- m_HD [A] Multiplicity index on HD
12- 16 F5.2 [Sun] [C/H] ?=- Elemental abundance [C/H]
18- 21 F4.2 [Sun] e_[C/H] ?=- rms uncertainty on [C/H]
23- 27 F5.2 [Sun] [Na/H] Elemental abundance [Na/H]
29- 33 F5.3 [Sun] e_[Na/H] rms uncertainty on [Na/H]
35- 39 F5.2 [Sun] [Al/H] ?=- Elemental abundance [Al/H]
41- 44 F4.2 [Sun] e_[Al/H] ?=- rms uncertainty on [Al/H]
46- 50 F5.2 [Sun] [Si/H] Elemental abundance [Si/H]
52- 56 F5.3 [Sun] e_[Si/H] rms uncertainty on [Si/H]
58- 62 F5.2 [Sun] [Ca/H] Elemental abundance [Ca/H]
64- 67 F4.2 [Sun] e_[Ca/H] rms uncertainty on [Ca/H]
69- 73 F5.2 [Sun] [TiI/H] Elemental abundance [ TiI/H]
75- 78 F4.2 [Sun] e_[TiI/H] rms uncertainty on [TiI/H]
80- 84 F5.2 [Sun] [TiII/H] ?=- Elemental abundance [TiII/H]
86- 89 F4.2 [Sun] e_[TiII/H] ?=- rms uncertainty on [TiII/H]
91- 95 F5.2 [Sun] [Ni/H] ?=- Elemental abundance [Ni/H]
97-100 F4.2 [Sun] e_[Ni/H] ?=- rms uncertainty on [Ni/H]
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History:
* 09-Nov-2006: From electronic version of the journal
* 18-Dec-2006: In table3, HD 43884 corrected into HD 43834.
(End) Patricia Vannier [CDS] 09-Nov-2006