J/A+A/610/A17 RV of candidate hybrid variable stars (Lampens+, 2018)
Multi-technique investigation of the binary fraction of A-F type candidate
hybrid variable stars discovered by Kepler.
Lampens P., Fremat Y., Vermeylen L., Sodor A., Skarka M., De Cat P.,
Bognar Zs., De Nutte R., Dumortier L., Escorza A., Oomen G.M.,
Van de Steene G., Kamath D., Laverick M., Samadi A., Triana S., Lehmann H.
<Astron. Astrophys. 610, A17 (2018)>
=2018A&A...610A..17L 2018A&A...610A..17L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Binaries, spectroscopic ; Radial velocities
Keywords: techniques: spectroscopic - stars: binaries: spectroscopic -
techniques: photometric - stars: oscillations (including pulsations) -
stars: rotation - stars: variables: delta Scuti
Abstract:
Hundreds of candidate hybrid pulsators of intermediate type A-F were
revealed by recent space missions. Hybrid pulsators allow us to study
the full stellar interiors, where both low-order p- and high-order
g-modes are simultaneously excited. The true hybrid stars must be
identified since other processes, related to stellar multiplicity or
rotation, might explain the presence of (some) low frequencies
observed in their periodograms. We measured the radial velocities of
50 candidate delta Scuti - gamma Doradus hybrid stars from the Kepler
mission with the Hermes and Ace spectrographs over a time span of
months to years. We aim to derive the fraction of binary and multiple
systems and to provide an independent and homogeneous determination of
the atmospheric properties and v.sini for all targets. The
long(er)-term objective is to identify the (probable) physical cause
of the low frequencies. We computed one-dimensional cross-correlation
functions (CCFs) in order to find the best set of parameters in terms
of number of components, spectral type(s), and v.sini for each target.
Fundamental parameters were determined by fitting (composite)
synthetic spectra to the normalised median spectra corrected for the
appropriate Doppler shifts. We report on the analysis of 478
high-resolution Hermes and 41 Ace spectra of A/F-type candidate hybrid
pulsators from the Kepler field. We determined their radial
velocities, projected rotational velocities, and atmospheric
properties and classified our targets based on the shape of the CCFs
and the temporal behaviour of the radial velocities. We derived
orbital solutions for seven new systems. Three preliminary long-period
orbital solutions are confirmed by a photometric time-delay analysis.
Finally, we determined a global multiplicity fraction of 27 percent in
our sample of candidate hybrid stars.
Description:
We present the individual radial velocity measurements of 50 candidate
delta Scuti - gamma Doradus hybrid stars and one delta Scuti star from
the Kepler mission collected with the Hermes and Ace spectrographs
over a time span of months to years. The radial velocities were
measured using spectrum synthesis and a two-dimensional
cross-correlation technique in the case of double- and triple-lined
systems.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 147 51 Classification, model parameters and atmospheric
stellar parameters obtained from the
Hermes spectra
tablec2.dat 83 23 Comparison of atmospheric stellar parameters
obtained in this work with published values
(assuming other parameters are equivalent)
tablec3.dat 109 26 Comparison of atmospheric stellar parameters
obtained in this work with the LAMOST results
based on the ROTFIT procedure
table2.dat 39 347 List of radial velocity data used in this work.
I. Single objects and single-lined systems
table3.dat 68 169 List of radial velocity data used in this work.
II. Double- and triple-lined systems
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/AJ/149/68 : A-F type variable stars from Kepler (Bradley+, 2015)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Kepler Identifier
10- 11 I2 h RAh Rigth ascension (J2000)
13- 14 I2 min RAm Rigth ascension (J2000)
16- 20 F5.2 s RAs Rigth ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 40 F7.5 d Per Period from KIC
42- 46 A5 --- SpType Spectral type
48- 51 I4 K TeffKIC ? Effective temperature from KIC
53- 56 F4.2 [cm/s2] loggKIC ? Logarithmic gravity from KIC
58- 61 F4.1 mag Kpmag Kepler magnitude
63- 64 I2 --- H Number of Hermes/Ace spectra
66- 77 A12 --- Com Comments (1)
79- 84 A6 --- Cat Classification type
86- 98 A13 --- ParamMod Parameters of the synthetic spectrum
100-103 I4 K TeffMean ? Mean effective temperature
105-106 A2 --- l_loggMean [>≤ ] Limit flag on loggMean
107-109 F3.1 [cm/s2] loggMean ? Mean logarithmic gravity or lower value of
mean logarithmic gravity interval
110 A1 --- --- [-]
111-113 F3.1 [cm/s2] loggMeanM ? Upper value of mean logarithmic gravity
interval
115-118 I4 K TeffGIR ? Effective temperature from GIRFIT
120-123 F4.2 [cm/s2] loggGIR ? Logarithmic gravity from GIRFIT
125-127 I3 km/s vsiniGIR ? Projected rotation velocity from GIRFIT
129-136 A8 --- Note Note
138-147 A10 --- FileName Name of the table with radial velocity data
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Note (1): References and notes:
(a) = from Uytterhoeven et al. (2011, Cat. J/A+A/534/A125)
(b) = from Slawson et al. (2011, Cat. J/AJ/142/160)
(d) = for range [510-520]nm
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Byte-by-byte Description of file: tablec2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 I8 --- KIC Kepler Identifier
10- 13 A4 --- SpType Spectral type
15- 18 I4 K TeffKIC Effective temperature from KIC
20- 23 F4.2 [cm/s2] loggKIC Logarithmic gravity from KIC
25- 28 F4.1 mag Kpmag Kepler magnitude
30- 35 A6 --- Cat Classification type
37- 40 I4 K TeffMean ? Mean effective temperature
42- 43 A2 --- l_loggMean [<≥ ] Limit flag on loggMean
44- 46 F3.1 [cm/s2] loggMean ? Mean logarithmic gravity or lower value
of mean logarithmic gravity
47 A1 --- --- [-]
48- 50 F3.1 [cm/s2] loggMeanM ? Upper value of mean logarithmic gravity
52- 55 I4 K TeffGIR Effective temperature from GIRFIT
57- 60 F4.2 [cm/s2] loggGIR Logarithmic gravity from GIRFIT
62- 64 I3 km/s vsiniGIR Projected rotation velocity from GIRFIT
66- 69 I4 K Tefflit Effective temperature from literature
71- 74 F4.2 [cm/s2] logglit Logarithmic gravity from literature
76- 78 I3 km/s vsinilit Projected rotation velocity from literature
80- 83 A4 --- Source Reference from literature (1)
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Note (1): Source as follows:
(11) = Catanzaro et al. (2011MNRAS.411.1167C 2011MNRAS.411.1167C)
(13) = Tkachenko et al. (2013, Cat. J/A+A/556/A52)
(15) = Niemczura et al. (2015, Cat. J/MNRAS/450/2764)
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Byte-by-byte Description of file: tablec3.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Kepler Identifier
10- 13 A4 --- SpType Spectral type
15- 18 I4 K TeffKIC ? Effective temperature from KIC
20- 23 F4.2 [cm/s2] loggKIC ? Logarithmic gravity from KIC
25- 29 F5.2 mag Kpmag Kepler magnitude
31- 36 A6 --- Cat Classification type
38- 41 I4 K TeffGIR Effective temperature from GIRFIT
43- 46 F4.2 [cm/s2] loggGIR Logarithmic gravity from GIRFIT
47 A1 --- n_loggGIR [*] Note on loggGIR (1)
49- 51 I3 km/s vsiniGIR Projected rotation velocity from GIRFIT
52 A1 --- n_vsiniGIR [*] Note on vsiniGIR (1)
54- 61 A8 --- SpTypeLam Spectral type from LAMOST
63- 66 I4 K TeffRot Effective temperature from ROTFIT
68- 70 I3 K e_TeffRot rms uncertainty on TeffRot
72- 75 F4.2 [cm/s2] loggRot Logarithmic gravity from ROTFIT
77- 80 F4.2 [cm/s2] e_loggRot rms uncertainty on loggRot
82- 86 F5.2 [-] [Fe/H]Rot Metallicity from ROTFIT
88- 91 F4.2 [-] e_[Fe/H]Rot rms uncertainty on [Fe/H]Rot
93- 97 F5.1 km/s RVRot Radial velocity from ROTFIT
99-102 F4.1 km/s e_RVRot rms uncertainty on RVRot
104-106 I3 km/s vsiniRot ? Projected rotation velocity from ROTFIT
108-109 I2 km/s e_vsiniRot ? rms uncertainty on vsiniRot
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Note (1): * kept fixed while determining the other parameters.
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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- 8 I8 --- KIC Kepler Identifier
10- 22 F13.5 d HJD Heliocentric Julian Date
24- 30 F7.3 km/s RV1 Radial velocity
32- 37 F6.3 km/s e_RV1 Radial velocity uncertainty
39 I1 --- Source [1/2] Source (G1)
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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- 8 I8 --- KIC Kepler Identifier
10- 22 F13.5 d HJD Heliocentric Julian Date
24- 30 F7.3 km/s RV1 Radial velocity, primary component
32- 37 F6.3 km/s e_RV1 Radial velocity uncertainty
39- 45 F7.3 km/s RV2 Radial velocity, secondary component
47- 51 F5.3 km/s e_RV2 Radial velocity uncertainty
53- 59 F7.3 km/s RV3 ?=- Radial velocity, tertiary component
61- 66 F6.3 km/s e_RV3 ?=- Radial velocity uncertainty
68 I1 --- Source [1/2] Source (G1)
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Global notes:
Note (G1): Source as follows:
1 = Hermes
2 = Ace
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Acknowledgements:
Patricia Lampens, patricia.lampens(at)oma.be
(End) Patricia Lampens [KSB, Belgium], Patricia Vannier [CDS] 29-Sep-2017