J/A+A/610/A17RV 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 (SIMBAD/NED BibCode)ADC_Keywords: Stars, variable ; Binaries, spectroscopic ; Radial velocitiesKeywords: techniques: spectroscopic - stars: binaries: spectroscopic - techniques: photometric - stars: oscillations (including pulsations) - stars: rotation - stars: variables: delta ScutiAbstract: 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:

FileName Lrecl Records Explanations

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

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

Bytes Format Units Label Explanations

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

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

Byte-by-byte Description of file: tablec2.dat

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)

Note (1): Source as follows: (11) = Catanzaro et al. (2011MNRAS.411.1167C) (13) = Tkachenko et al. (2013, Cat. J/A+A/556/A52) (15) = Niemczura et al. (2015, Cat. J/MNRAS/450/2764)

Byte-by-byte Description of file: tablec3.dat

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- 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

Note (1): * kept fixed while determining the other parameters.

Byte-by-byte Description of file: table2.dat

Bytes Format Units Label Explanations

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)

Byte-by-byte Description of file: table3.dat

Bytes Format Units Label Explanations

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)

Global notes:Note (G1): Source as follows: 1 = Hermes 2 = Ace

Acknowledgements: Patricia Lampens, patricia.lampens(at)oma.be(End)Patricia Lampens [KSB, Belgium], Patricia Vannier [CDS] 29-Sep-2017

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