J/A+A/517/A3 Stellar parameters of Kepler early-type targets (Catanzaro+, 2010)
Characterization of Kepler early-type targets.
Catanzaro G., Frasca A., Molenda-Zakowicz J., Marilli E.
<Astron. Astrophys. 517, A3 (2010)>
=2010A&A...517A...3C 2010A&A...517A...3C
ADC_Keywords: Stars, early-type ; Abundances ; Spectroscopy ; Photometry, uvby
Keywords: stars: early-type - stars: abundances -
stars: fundamental parameters - stars: binaries: spectroscopic
Abstract:
Stellar pulsation offers a unique opportunity to constrain the
intrinsic parameters of stars and to unveil their inner structure.
Kepler satellite is collecting a huge amount of data of unprecedent
photometric precision, that will allow us to test theory and obtain a
very precise tomography of stellar interiors. Aiming at providing the
stars' fundamental parameters (Teff, logg, vsini, and luminosity)
which are needed for computing asteroseismic models and interpreting
Kepler data, we report spectroscopic observations of 23 early-type
Kepler asteroseismic targets and 13 other stars in the Kepler field,
but not selected to be observed. The cross-correlation with template
spectra was used for measuring the radial velocity with the aim of
identifying non-single stars. Spectral synthesis has been performed in
order to derive the stellar parameters for our target stars.
State-of-art LTE atmospheric models have been computed.
For all the stars of our sample, we derive the radial velocity, Teff,
logg, vsini, and luminosities. Further, for 12 stars, we perform a
detailed abundance analysis of 20 species; for 16, we could derive
only the [Fe/H] ratio. A spectral classification has been also
performed for 17 stars in the sample. We found two double-lined
spectroscopic binaries, HIP96299 and HIP98551, the former of which is
an already known eclipsing binary, and two single-lined spectroscopic
binaries, HIP97254 and HIP97724. We also report two suspected
spectroscopic binaries, HIP92637 and HIP96762, and the detection of a
possible variability of the radial velocity of HIP96277. Two of our
program stars turn out to be chemically peculiar, namely HIP93941,
which we classify as B2 He-weak, and HIP96210, which we classify as
B6Mn. Finally, we find that HIP93522, HIP93941, HIP93943, HIP96210 and
HIP96762, are very slow rotators (vsini<20km/s) which makes them
very interesting and promising targets for an asteroseismic modeling.
Description:
Optical spectroscopy obtained with the 0.91m telescope of the Catania
Astrophysical Observatory is presented in Table 3. For 14 stars,
Stromgren photometry is also presented in Table 2. The chemical
abundances derived for 12 stars are reported in Table 4.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 92 14 Stromgren photometry for 14 stars
table3.dat 121 42 Stellar parameters derived for our sample stars
table4.dat 21 106 Chemical abundances for 12 stars
sp/* . 40 FITS spectra for the sample stars
--------------------------------------------------------------------------------
See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- HIP Hipparcos number (I/239)
7- 12 F6.3 mag Vmag V magnitude
14- 18 F5.3 mag e_Vmag V magnitude error
20- 25 F6.3 mag b-y b-y color index
27- 31 F5.3 mag e_b-y b-y color index error
33- 37 F5.3 mag m1 m1 color index
39- 43 F5.3 mag e_m1 m1 color index error
45- 50 F6.3 mag c1 c1 color index
52- 56 F5.3 mag e_c1 c1 color index error
58- 62 F5.3 mag beta Hbeta index
64- 68 F5.3 mag e_beta Hbeta index error
70- 74 I5 K Teff Effective Temperature
76- 79 F4.2 [cm/s2] logg Surface gravity
81- 85 F5.2 mag VMAG Absolute V magnitude
87- 92 F6.3 mag dm0 Distance modulus
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- n_HIP [Kn] K: Kepler asteroseismic targets or
n: stars not selected as Kepler targets
3- 7 I5 --- HIP Hipparcos number (I/239)
8 A1 --- m_HIP [AB] Multiplicity index in HIP
10- 17 I8 --- KIC ? Kepler Input Catalogue number
19- 23 F5.2 mag Vmag ? V magnitude
25- 29 F5.2 mas Plx ? Hipparcos parallax
31- 34 F4.2 mas e_Plx ? Parallax error
36- 37 A2 --- SpT MK spectral type
39 I1 --- e_SpT ? Spectral type error
41- 45 I5 K Teff ? Effective temperature
47- 50 I4 K e_Teff ? Effective temperature error
52- 54 F3.1 [cm/s2] logg ? Surface gravity
56- 58 F3.1 [cm/s2] e_logg ? Surface gravity error
60- 62 I3 km/s vsini ? Projected rotational velocity
64- 72 F9.3 d HJD Reduced Heliocentric Julian Day (HJD-2400000)
74- 78 F5.1 km/s RV Radial Velocity
80- 83 F4.1 km/s e_RV Radial Velocity error
85- 88 F4.2 solLum logL ? Luminosity
90- 93 F4.2 solLum e_logL ? Luminosity error left (lower limit)
95- 98 F4.2 solLum E_logL ? Luminosity error right (upper limit)
100-121 A22 --- FileName Name of the FITS spectra in subdirectory sp
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- HIP Hipparcos number (I/239)
7- 8 I2 --- Z Atomic number
11- 12 A2 --- X Atomic symbol
14- 17 F4.1 [Sun] Abun Abundance
19- 21 F3.1 [Sun] e_Abun Abundance error
--------------------------------------------------------------------------------
Acknowledgements:
Gianni Catanzaro, gca(at)oact.inaf.it
(End) Giovanni Catanzaro [INAF-OACt, Italy], Patricia Vannier [CDS] 25-Mar-2010