J/MNRAS/444/2251 G0-G3 main-sequence stars with V<15 (Lopez-Valdivia+, 2014)
Supersolar metallicity in G0-G3 main-sequence stars with V < 15.
Lopez-Valdivia R., Bertone E., Chavez M., Tapia-Schiavon C.,
Hernandez-Aguila J.B., Valdes J.R., Chavushyan V.
<Mon. Not. R. Astron. Soc., 444, 2251-2262 (2014)>
=2014MNRAS.444.2251L 2014MNRAS.444.2251L
ADC_Keywords: Stars, fundamental ; Stars, G-type ; Stars, dwarfs ;
Effective temperatures ; Abundances
Keywords: stars: atmospheres - stars: fundamental parameters - stars: solar-type
Abstract:
The basic stellar atmospheric parameters (effective temperature,
surface gravity and global metallicity) were determined simultaneously
for a sample of 233 stars, limited in magnitude (V<15), with spectral
types between G0 and G3 and luminosity class V (main sequence). The
analysis was based on spectroscopic observations collected at the
Observatorio Astrofisico Guillermo Haro and using a set of Lick-like
indices defined in the spectral range 3800-4800Å. An extensive set
of indices computed in a grid of theoretical spectra was used as a
comparison tool in order to determine the photospheric parameters. The
method was validated by matching the results from spectra of the
asteroids Vesta and Ceres with the Sun parameters. The main results
were as follows: (i) the photospheric parameters were determined for
the first time for 213 objects in our sample and (ii) a sample of 20
new super-metal-rich star candidates was found.
Description:
We selected in late 2008 a sample of stars from the Set of
Identifications, Measurements, and Bibliography for Astronomical Data
(SIMBAD) data base using the following criteria: (i) spectral type
between G0 and G3; (ii) luminosity class V; (iii) visible magnitude
V<15mag; (iv) declination δ>-10°. The selection resulted in
about 1200 objects. We report here the results for 233 stars. We
carried out the spectroscopic observations at the 2.12-m telescope of
the Observatorio Astrofisico Guillermo Haro (Sonora, Mexico) between
2008 and 2013, with a Boller & Chivens spectrograph, equipped with a
Versarray 1300x1340 CCD.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 36 233 The sample of observed stars
table2.dat 24 64 Atmospheric parameters for the 64 reference stars
table5.dat 68 235 Stellar atmospheric parameters
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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- 21 A21 --- Name Star name
23- 27 F5.2 mag Vmag [4/15]? Simbad V band magnitude
29- 36 A8 --- SpType Simbad MK spectral type
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
3- 8 I6 --- HD Star ID in HD catalog
10- 13 I4 K Teff [4857/7000] Effective temperature
15- 18 F4.2 [cm/s2] logg [3/4.7] Surface gravity
20- 24 F5.2 [Sun] [M/H] [-1.5/0.3] Global metallicity
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- Name Star name
22 A1 --- n_Name [*] Outlier (1)
24- 27 I4 K Teff [5000/7000] Effective Temperature
29- 31 I3 K e_Teff [0/150] Lower 1-σ error on Teff
33- 35 I3 K E_Teff [0/175] Upper 1-σ error on Teff
37- 40 F4.2 [cm/s2] logg [3/5] Surface gravity
42- 45 F4.2 [cm/s2] e_logg [0/0.7] Lower 1-σ error on logg
47- 50 F4.2 [cm/s2] E_logg [0/0.9] Upper 1-σ error on logg
52- 56 F5.2 [-] [M/H] Global metallicity
58- 61 F4.2 [-] e_[M/H] Lower 1-σ error on [M/H]
63- 66 F4.2 [-] E_[M/H] Upper 1-σ error on [M/H]
68 A1 --- SMR [*] * indicates super-metal-rich (SMR) stars
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Note (1): * indicates the 10 'outliers' for which the best fit described in
Sect. 5 yields a surface gravity at the lower boundary of the synthetic
grid (logg=3.0).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Apr-2015