J/A+A/581/A68 Stellar parameters for CoRoT exoplanet field stars (Cortes+, 2015)
Stellar parameters for stars of the CoRoT exoplanet field.
Cortes C., Maciel S.C., Vieira S., Ferreira Lopes C.E., Leao I.C.,
De Oliveira G.P., Correia C., Canto Martins B.L., Catelan M.,
De Medeiros J.R.
<Astron. Astrophys., 581, A68 (2015)>
=2015A&A...581A..68C 2015A&A...581A..68C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, dwarfs ; Stars, giant ; Effective temperatures ;
Rotational velocities ; Abundances, [Fe/H]
Keywords: stars: abundances - stars: rotation - stars: variables: general
Abstract:
Spectroscopic observations represent a fundamental step in the
physical characterization of stars and, in particular, in the precise
location of stars in the HR diagram. Rotation is also a key parameter,
impacting stellar properties and evolution, which modulates the
interior and manifests itself on the surface of stars. To date, the
lack of analysis based on large samples has prevented our
understanding of the real impact of stellar parameters and rotation on
the stellar evolution as well as on the behavior of surface
abundances. The space missions, CoRoT and Kepler, are providing us
with rotation periods for thousands of stars, thus enabling a robust
assessment of the behavior of rotation for different populations and
evolutionary stages. For these reasons, the follow-up programs are
fundamental to increasing the returns of these space missions. An
analysis that combines spectroscopic data and rotation/modulation
periods obtained from these space missions provides the basis for
establishing the evolutionary behavior of the angular momentum of
solar-like stars at different evolutionary stages, and the relation of
rotation with other relevant physical and chemical parameters. To
support the computation and evolutionary interpretation of periods
associated with the rotational modulation, oscillations, and
variability of stars located in the CoRoT fields, we are conducting a
spectroscopic survey for stars located in the fields already observed
by the satellite. These observations allow us to compute physical and
chemical parameters for our stellar sample. Using spectroscopic
observations obtained with UVES/VLT and Hydra/Blanco, and based on
standard analysis techniques, we computed physical and chemical
parameters (Teff, log(g), [Fe/H], vmic, vrad, vsin(i), and
A(Li)) for a large sample of CoRoT targets. We provide physical and
chemical parameters for a sample comprised of 138 CoRoT targets. Our
analysis shows the stars in our sample are located in different
evolutionary stages, ranging from the main sequence to the red giant
branch, and range in spectral type from F to K. The physical and
chemical properties for the stellar sample are in agreement with
typical values reported for FGK stars. However, we report three stars
presenting abnormal lithium behavior in the CoRoT fields. These
parameters allow us to properly characterize the intrinsic properties
of the stars in these fields. Our results reveal important differences
in the distributions of metallicity, Teff, and evolutionary status
for stars belonging to different CoRoT fields, in agreement with
results obtained independently from ground-based photometric surveys.
Our spectroscopic catalog, by providing much-needed spectroscopic
information for a large sample of CoRoT targets, will be of key
importance for the successful accomplishment of several different
programs related to the CoRoT mission, thus it will help further boost
the scientific return associated with this space mission.
Description:
The present stellar sample is composed of 138 stars of spectral types
F, G, and K, with visual magnitudes V between 10 to 14, located in two
exoplanet fields observed by CoRoT, namely the Galactic center (LRc01:
Long Run Center 01) and the Galactic anticenter (LRa01: Long Run
Anticenter 01) fields.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 53 CoRoT IDs, ephemerides, details of observations,
photometry, and estimated luminosity classes
for the UVES stars
table3.dat 77 85 Main characteristics for the Hydra stars
table7.dat 126 138 Stellar parameters for the stars in our sample
table9.dat 39 11 Common stars with Gazzano et al.
(2010, Cat. J/A+A/523/A91)
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See also:
B/corot : CoRoT observation log (N2-4.4) (CoRoT 2016)
J/A+A/541/A34 : Spectral types of stars in CoRoT fields (Sebastian+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- CoRoT CoRoT identification number
11- 12 I2 h RAh Right ascension (J2000)
14- 15 I2 min RAm Right ascension (J2000)
17- 22 F6.3 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 35 F5.2 arcsec DEs Declination (J2000)
37- 47 A11 "date" Obs.Date Observation date
49- 52 I4 s Texp Exposure time
54- 56 I3 --- S/N Signal-to-noise ration
58- 62 F5.2 mag Vmag V magnitude from CoRoT database
64- 67 F4.2 mag B-V B-V colour index from CoRoT database
69- 73 F5.2 mag Jmag 2MASS J magnitude
75- 79 F5.2 mag Hmag 2MASS H magnitude
81- 85 F5.2 mag Ksmag 2MASS Ks magnitude
87- 89 A3 --- LC Luminosity class
91- 95 A5 --- Field CoRoT field
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- CoRoT CoRoT identification number
11- 12 I2 h RAh Right ascension (J2000)
14- 15 I2 min RAm Right ascension (J2000)
17- 21 F5.2 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 34 F5.2 arcsec DEs Declination (J2000)
36- 38 I3 --- S/N Signal-to-noise ration
40- 44 F5.2 mag Vmag V magnitude from CoRoT database
46- 49 F4.2 mag B-V B-V colour index from CoRoT database
51- 55 F5.2 mag Jmag 2MASS J magnitude
57- 61 F5.2 mag Hmag 2MASS H magnitude
63- 67 F5.2 mag Ksmag 2MASS Ks magnitude
69- 71 A3 --- LC Luminosity class
73- 77 A5 --- Field CoRoT field
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- CoRoT CoRoT identification number
11- 14 I4 K TeffB-V Effective temperature from B-V colour index
16- 19 I4 K TeffJ-K Effective temperature from J-K colour index
21- 24 I4 K Teff Effective temperature
26- 28 I3 K E_Teff Error on Teff (upper value)
30- 32 I3 K e_Teff Error on Teff (lower value)
34- 37 F4.2 [cm/s2] logg Surface gravity
39- 42 F4.2 [cm/s2] E_logg Error on logg (upper value)
44- 47 F4.2 [cm/s2] e_logg Error on logg (lower value)
49- 52 F4.2 km/s Vmic Microturbulrnt velocity
54- 57 F4.2 km/s E_Vmic Error on Vmic (upper value)
59- 62 F4.2 km/s e_Vmic Error on Vmic (lower value)
64- 68 F5.2 [-] [Fe/H] Metallicyty
70- 73 F4.2 [-] e_[Fe/H] rms uncertainty on [Fe/H]
75- 76 I2 --- oFeI Number of FeI lines used
78- 79 I2 --- oFeII Number of FeII lines used
81- 85 F5.2 [-] A(Li) ?=- Lithium abundance
87- 90 F4.2 [-] e_A(Li) ? rms uncertainty on A(Li)
91 A1 --- n_A(Li) [a] Note on A(Li) (1)
93- 94 I2 km/s vsini Rorational velocity
96 I1 km/s E_vsini Error on vsini (upper value)
98 I1 km/s e_vsini Error on vsini (lower value)
100-104 F5.1 km/s RV Radial velocity
106-109 F4.2 mag E(B-V) ?=- B-V colour excess
110 A1 --- n_E(B-V) [b] Note on E(B-V) (1)
112-115 F4.2 mag E(J-K) ?=- J-K colour excess
116 A1 --- n_E(J-K) [c] Note on E(J-K) (1)
118-120 A3 --- Statuts Evolutionnary status (2)
122-126 A5 --- Inst Instrument
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Note (1): Notes as follows:
a = measurement of A(Li) can not be obtained from the spectrum
b = reddening values E(B-V) can not be obtained since Teff<Teff(B-V)
c = reddening values E(J-K) can not be obtained since Teff<Teff(J-K)
Note (2): Evolutionnary status as follows:
MS = main sequence stars
RGB = red giant branch stars
SGB = subgiant branch stars
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- CoRoT CoRoT identification number
11- 14 I4 K Teff Our work effective temperature
16- 19 F4.2 [cm/s2] logg Our work surface gravity
21- 24 F4.1 km/s vsini Our work rotational velocity
26- 29 I4 K TeffG ?=- Gazzano et al. (2010, Cat. J/A+A/523/A91)
effective temperature
31- 34 F4.2 [cm/s2] loggG ?=- Gazzano et al. (2010, Cat. J/A+A/523/A91)
surface gravity
36- 39 F4.1 km/s vsiniG Gazzano et al. (2010, Cat. J/A+A/523/A91)
rotational velocity
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Aug-2016