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Table 1

Stellar properties of Kepler-278 and Kepler-391.

Parameter Kepler-278 Kepler-391 Source
Astrometry
Right Ascension, RA 19:20:25.73 19:22:29.23 Gaia DR2
Declination, Dec +38:42:08.03 +51:03:26.32 Gaia DR2
Proper motion in RA, μα [mas yr−1] 2.637 ± 0.047 10.3 ± 0.034 Gaia DR2
Proper motion in Dec, μδ [mas yr−1] 8.95 ± 0.052 7.585 ± 0.036 Gaia DR2
Parallax, π [mas] (a) 2.146 ± 0.119 1.040 ± 0.112 Gaia DR2
Kinematics and position
Barycentric radial velocity, RV [km s−1] −46.98 ± 0.04 21.59 ± 0.05 This work
Distance, d [pc] (b) 465.98 ± 25 963 ± 103 This work
Space velocity component, U [km s−1] 24.56 ± 0.60 36.33 ± 2.36 This work
Space velocity component, V [km s−1] −32.24 ± 0.19 40.43 ± 0.71 This work
Space velocity component, W [km s−1] 1.26 ± 0.15 −14.67 ± 1.35 This work
Cartesian Galactic coordinate, X [pc] 430.4 ± 4.9 916.8 ± 10.5 This work
Cartesian Galactic coordinate, Y [pc] 8349.9 ± 96.1 8379.3 ± 96.4 This work
Cartesian Galactic coordinate, Z [pc] 91.8 ± 1.1 268.8 ± 3.1 This work
Photometry (c)
Kep [mag] 11.584 13.007 KIC
G [mag] 11.530 ± 0.003 12.984 ± 0.001 Gaia DR2
BP [mag] 12.068 ± 0.001 13.492 ± 0.002 Gaia DR2
RP [mag] 10.873 ± 0.001 12.342 ± 0.001 Gaia DR2
B [mag] 12.79 ± 0.24 14.075 ± 0.018 APASS
V [mag] 11.818 ± 0.14 13.203 ± 0.015 APASS
g [mag] 12.328 13.599 ± 0.003 PAN-STARRS
r [mag] 11.644 13.206 PAN-STARRS
i [mag] 11.338 12.892 PAN-STARRS
z [mag] 11.163 12.713 PAN-STARRS
y [mag] 11.081 12.535 ± 0.005 PAN-STARRS
J [mag] 10.047 ± 0.021 11.564 ± 0.025 2MASS
H[mag] 9.581 ± 0.018 11.072 ± 0.027 2MASS
Ks[mag] 9.465 ± 0.018 10.97 ± 0.025 2MASS
W1 [mag] 9.37 ± 0.024 10.916 ± 0.024 ALLWISE
W2 [mag] 9.456 ± 0.02 11.001 ± 0.02 ALLWISE
W3 [mag] 9.285 ± 0.025 10.991 ± 0.057 ALLWISE
W4 [mag] 8.57 ± 0.207 <9.365 ALLWISE
Fundamental and physical parameters
Effective temperature, Teff [K] 4965 ± 54 5038 ± 57 This work
Surface gravity, log g [cgs] 3.58 ± 0.095 3.62 ± 0.05 This work
Metallicity, [Fe∕H] 0.22 ± 0.04 0.04 ± 0.02 This work
Microturbulent velocity, vmicro [km s−1 ] 1.12 ± 0.09 0.92 ± 0.06 This work
Macroturbulent velocity, vmacro [km s−1 ] 3.54 ± 1.32 3.72 ± 1.70 This work
Rotational velocity, v sin i [km s−1 ] 2.50 ± 0.67 2.60 ± 0.70 This work
Spectral type, ST K2 III-IV K2 III-IV This work
Activity index −5.31 ± 0.04 −5.14 ± 0.04 This work
Mass, M⋆ [M⊙ ] 1.227 ± 0.061 1.270 ± 0.081 This work
Radius, R⋆ [R⊙ ] 2.861 ± 0.060 2.879 ± 0.318 This work
Age, τ⋆ [Gyr] 5.761 ± 1.019 4.365 ± 0.899 This work
Density, ρ⋆ [g cm−3 ] (d) 0.074 ± 0.005 0.073 ± 0.006 This work
Luminosity, L⋆ [L⊙ ] (e) 4.46 ± 0.57 4.60 ± 1.34 This work
Asteroseismic properties
Frequency separation, Δν [μHz] 30.63 ± 0.20 – Huber et al. (2013)
Frequency of maximum oscillation power, νmax [μHz] 500.7 ± 7.0 – Huber et al. (2013)

Notes. (a) Values have been corrected for the −82 ± 33 μarcsec offset found by Stassun & Torres (2018). (b)Derived from the corrected Gaia DR2 parallaxes (Gaia Collaboration 2018). To compute the errors on the distances, we have quadratically included 0.1 mas to the parallaxes uncertainties to account for systematic errors of Gaia’s astrometry (Luri et al. 2018). (c) We assume 1% of error when no errors are available in the catalogs. (d) Calculated from the derived stellar radius and mass. (e)Calculated using the relation .

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