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J/A+A/526/A99 Metal-poor solar-type stars spectroscopy and masses (Sousa+, 2011)

Spectroscopic characterization of a sample of metal-poor solar-type stars from the HARPS planet search program. Precise spectroscopic parameters and mass estimation. Sousa S.G., Santos N.C., Israelian G., Lovis C., Mayor M., Silva P.B., Udry S. <Astron. Astrophys. 526, A99 (2011)> =2011A&A...526A..99S
ADC_Keywords: Stars, nearby ; Spectroscopy ; Parallaxes, trigonometric ; Photometry ; Stars, masses Keywords: stars: fundamental parameters - planetary systems - stars: abundances - stars: statistics Abstract: Stellar metallicity strongly correlates with the presence of planets and their properties. To check for new correlations between stars and the existence of an orbiting planet, we determine precise stellar parameters for a sample of metal-poor solar-type stars. This sample was observed with the HARPS spectrograph and is part of a program to search for new extrasolar planets. Description: The stellar parameters were determined using an LTE analysis based on equivalent widths (EW) of iron lines and by imposing excitation and ionization equilibrium. The ARES code (that can be downloaded at ) was used to allow automatic and systematic derivation of the stellar parameters. Precise stellar parameters and metallicities were obtained for 97 low metal-content stars. We also present the derived masses, luminosities, and new parallaxes estimations based on the derived parameters, and compare our spectroscopic parameters with an infra-red flux method calibration to check the consistency of our method in metal poor stars. Both methods seems to give the same effective temperature scale. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 38 104 Details of the spectral data for each star table2.dat 94 97 Stellar parameters for the metal poor sample table3.dat 78 103 Photometry used for the use of IFRM calibration
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/297 : NOMAD Catalog (Zacharias+ 2005) I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) V/109 : SKY2000 Catalog, Version 4 (Myers+ 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star's identifier 12- 13 I2 --- Nsp Total number of spectra observed 15- 16 I2 --- Ncsp Number of combined spectra 18- 23 F6.2 --- S/Nh Highest S/N value from the combined spectrum 25- 30 F6.2 --- S/Nl Lowest S/N value from the combined spectrum 32- 38 F7.2 --- S/N Final S/N for the combined spectrum
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star's identifier 12- 15 I4 K Teff Effective temperature 17- 19 I3 K e_Teff Error on Teff 21- 24 F4.2 [cm/s2] logg Spectroscopic surface gravity 26- 29 F4.2 [cm/s2] e_logg Error on logg 31- 34 F4.2 km/s xi Microturbulence velocity 36- 39 F4.2 km/s e_xi Error on Vtur 41- 45 F5.2 [Sun] [Fe/H] Iron abundance [Fe//H] 47- 50 F4.2 [Sun] e_[Fe/H] Error on [Fe//H] 52- 54 I3 --- NFe1 Number of FeI lines used 56- 57 I2 --- NFe2 Number of FeII lines used 59- 62 F4.2 Msun M.HIP ?=- Stellar mass determined directly from Padova webinterface using Hipparcos parallax 64- 67 F4.2 Msun e_M.HIP ? Error on M.HIP 69- 72 F4.2 Msun Mass ?=- Estimation of the stellar mass using iterative procedure to compute new parallax values 74- 77 F4.2 Msun e_Mass ? Error on Mass 79- 83 F5.2 mas plxH ?=- Hipparcos parallax 85- 88 F4.2 mas e_plxH ? Error on Hipparcos parallax 90- 94 F5.2 mas plx ?=- Estimated parallax from iterative procedure
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star's identifier 11- 15 F5.2 mag Umag ?=- SKY2000 U magnitude (1) 17- 22 F6.3 mag Bmag ?=- NOMAD B magnitude (2) 24- 29 F6.3 mag Vmag NOMAD V magnitude (2) 30 A1 --- n_Vmag [*] * for Vmag from HIP catalog 31- 36 F6.3 mag Imag ?=- NOMAD I magnitude (2) 38- 42 F5.3 mag V-I ?=- HIP V-I color index (3) 44- 48 F5.3 mag Jmag ?=- 2MASS J magnitude (4) 50- 54 F5.3 mag Hmag ?=- 2MASS H magnitude (4) 56- 60 F5.3 mag Kmag ?=- 2MASS K magnitude (4) 62- 66 F5.3 mag e_Jmag ?=- Error on J magnitude 68- 72 F5.3 mag e_Hmag ?=- Error on H magnitude 74- 78 F5.3 mag e_Kmag ?=- Error on K magnitude
Note (1): from the SKY2000 Catalog, Version 4 (Myers et al., 2001, Cat. V/109) Note (2): were obtained from the NOMAD catalog (Zacharias et al. 2004, Cat. I/297) Note (3): from the index V-I obtained in the Hipparcos catalog (van Leeuwen, 2007, Cat. I/311) Note (4): were obtained from the 2MASS catalog (Cutri et al. 2003, Cat. II/246/)
Acknowledgements: Sergio G. Sousa, sousasag(at)
(End) Sergio G. Sousa [CAUP-Porto, Portugal], Patricia Vannier [CDS] 04-Jan-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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