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J/ApJ/844/102  KIC star parallaxes from asteroseismology vs Gaia  (Huber+, 2017)

Asteroseismology and Gaia: testing scaling relations using 2200 Kepler stars with TGAS parallaxes. Huber D., Zinn J., Bojsen-Hansen M., Pinsonneault M., Sahlholdt C., Serenelli A., Aguirre V.S., Stassun K., Stello D., Tayar J., Bastien F., Bedding T.R., Buchhave L.A., Chaplin W.J., Davies G.R., Garcia R.A., Latham D.W., Mathur S., Mosser B., Sharma S. <Astrophys. J., 844, 102 (2017)> =2017ApJ...844..102H
ADC_Keywords: Asteroseismology ; Parallaxes, trigonometric ; Photometry, SDSS ; Photometry, infrared ; Abundances, [Fe/H] ; Stars, diameters Keywords: parallaxes; stars: distances; stars: fundamental parameters; stars: late-type; stars: oscillations; techniques: photometric Abstract: We present a comparison of parallaxes and radii from asteroseismology and Gaia DR1 (TGAS) for 2200 Kepler stars spanning from the main sequence to the red-giant branch. We show that previously identified offsets between TGAS parallaxes and distances derived from asteroseismology and eclipsing binaries have likely been overestimated for parallaxes ≲5-10mas (∼90%-98% of the TGAS sample). The observed differences in our sample can furthermore be partially compensated by adopting a hotter Teff scale (such as the infrared flux method) instead of spectroscopic temperatures for dwarfs and subgiants. Residual systematic differences are at the ∼2% level in parallax across three orders of magnitude. We use TGAS parallaxes to empirically demonstrate that asteroseismic radii are accurate to ∼5% or better for stars between ∼0.8-8R. We find no significant offset for main- sequence (≲1.5R) and low-luminosity RGB stars (∼3-8R), but seismic radii appear to be systematically underestimated by ∼5% for subgiants (∼1.5-3R). We find no systematic errors as a function of metallicity between [Fe/H]~-0.8 to +0.4dex, and show tentative evidence that corrections to the scaling relation for the large frequency separation (Δν) improve the agreement with TGAS for RGB stars. Finally, we demonstrate that beyond ∼3kpc asteroseismology will provide more precise distances than end-of-mission Gaia data, highlighting the synergy and complementary nature of Gaia and asteroseismology for studying galactic stellar populations. Description: Our sample consists of dwarfs, subgiants, and red giants from the APOGEE-Kepler Asteroseismic Science Consortium (APOKASC, Pinsonneault+ J/ApJS/215/19), supplemented with seismic detections using Kepler short-cadence data from Chaplin+ (2014MNRAS.445..946C) and Huber+ (2013, J/ApJ/767/127). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 185 2236 Observational data table2.dat 302 2236 Derived fundamental properties, distances and extinctions
See also: V/133 : Kepler Input Catalog (Kepler Mission Team, 2009) I/337 : Gaia DR1 (Gaia Collaboration, 2016) J/A+A/506/465 : Solar-like oscillations in red giants (Hekker+, 2009) J/A+A/523/A48 : Gaia photometry (Jordi+, 2010) J/AJ/142/112 : KIC photometric calibration (Brown+, 2011) J/A+A/530/A138 : Geneva-Copenhagen survey re-analysis (Casagrande+, 2011) J/A+A/525/A131 : Solar-like oscillations in Kepler red giants (Hekker+, 2011) J/ApJ/746/101 : Diameters and temperatures of AFG stars (Boyajian+, 2012) J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012) J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012) J/ApJS/199/30 : Effective temperatures for KIC stars (Pinsonneault+, 2012) J/ApJ/757/161 : Spectroscopy of 56 exoplanet host stars (Torres+, 2012) J/ApJ/767/127 : Asteroseismic solutions for 77 Kepler stars (Huber+, 2013) J/ApJ/765/L41 : Asteroseismic classification of KIC objects (Stello+, 2013) J/ApJ/787/110 : Stromgren survey of seismic KIC stars (Casagrande+, 2014) J/ApJS/215/19 : APOKASC catalog of Kepler red giants (Pinsonneault+, 2014) J/MNRAS/445/2758 : KIC giants Bayesian dist. & extinctions (Rodrigues+ 2014) J/ApJ/808/187 : Metallicities of KIC stars without planets (Buchhave+, 2015) J/MNRAS/454/2863 : Teff against colours calibrations (Huang+, 2015) J/MNRAS/452/2127 : Parameters of Kepler stars (Silva Aguirre+, 2015) J/ApJ/832/121 : 4yr RV survey of red giant in eclipsing bin. (Gaulme+, 2016) J/ApJ/832/L18 : Gaia's DR1 parallaxes vs previous measurements (Jao+, 2016) J/ApJ/827/50 : Kepler faint red giants (Mathur+, 2016) J/AJ/152/180 : Bolometric fluxes of EB* in Tycho-2 (Stassun+, 2016) J/ApJ/831/L6 : Eclipsing binary parallaxes with Gaia data (Stassun+, 2016) J/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016) J/AJ/152/6 : Kepler stars param. with LAMOST & seismic data (Wang+, 2016) J/A+A/597/A30 : Seismology & spectro. of CoRoGEE red giants (Anders+, 2017) J/ApJS/229/30 : Revised properties of Q1-17 Kepler targets (Mathur+, 2017) J/ApJ/838/107 : Distances to RRab stars from WISE and Gaia (Sesar+, 2017) J/ApJ/835/173 : Kepler asteroseismic LEGACY data. II. (Silva Aguirre+, 2017) J/ApJ/835/83 : K2 GAP data release. I. Campaign 1 (Stello+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 I8 --- KIC [1160789/12735580] Kepler Input Catalog ID 10- 17 F8.3 uHz numax [2/4190] Frequency of maximum oscillation power 19- 25 F7.3 uHz e_numax [0.03/704] Uncertainty in numax (1) 27- 33 F7.3 uHz dnu [0.4/173.3] Large frequency separation (1) 35- 39 F5.3 uHz e_dnu [0.008/8.6] Uncertainty in dnu (1) 41- 48 F8.5 mas plx [-1.5/47] TGAS parallax 50- 56 F7.5 mas e_plx [0.2/1] Uncertainty in plx 58- 63 F6.3 mag BTmag [6.7/15]?=-99 Tycho BT band photometry 65- 69 F5.3 mag e_BTmag [0.01/0.8]?=-99 Uncertainty in BTmag 71- 76 F6.3 mag VTmag [5.9/13]?=-99 Tycho VT band photometry 78- 82 F5.3 mag e_VTmag [0.009/0.3]?=-99 Uncertainty in VTmag 84- 90 F7.3 mag gmag [7.5/13.7]?=-99 SDSS KIC g band magnitude (2) 92- 98 F7.3 mag e_gmag [0.02]?=-99 Uncertainty in gmag 100-106 F7.3 mag rmag [7.2/12.9]?=-99 SDSS KIC r band magnitude (2) 108-114 F7.3 mag e_rmag [0.02]?=-99 Uncertainty in rmag 116-122 F7.3 mag imag [7/12.7]?=-99 SDSS KIC i band magnitude (2) 124-130 F7.3 mag e_imag [0.02]?=-99 Uncertainty in imag 132-138 F7.3 mag zmag [7/12.5]?=-99 SDSS KIC z band magnitude 140-146 F7.3 mag e_zmag [0.02]?=-99 Uncertainty in zmag 148-153 F6.3 mag Jmag [5/11.5]?=-99 2MASS J band magnitude 155-159 F5.3 mag e_Jmag [0/0.3]?=-99 Uncertainty in Jmag 161-166 F6.3 mag Hmag [4.7/11.1]?=-99 2MASS H band magnitude 168-172 F5.3 mag e_Hmag [0/0.2]?=-99 Uncertainty in Hmag 174-179 F6.3 mag Ksmag [4.4/11.1]?=-99 2MASS Ks band magnitude 181-185 F5.3 mag e_Ksmag [0/0.07]?=-99 Uncertainty in Ksmag
Note (1): numax and dnu were calculated using the SYD pipeline, Huber+ (2009CoAst.160...74H), and taken from version 3.6.5 of the APOKASC catalog (Pinsonneault+, in prep) for giants and from a reanalysis of the Chaplin+ (2014, J/ApJS/210/1) sample for dwarfs and subgiants (Serenelli+, in prep). Note that for our analysis we added a 1% and 0.5% uncertainty in numax and dnu in quadrature to the formal uncertainties listed here to account for differences between asteroseismic analysis methods. Note (2): gri denotes KIC photometry converted into the SDSS scale using the transformations by Pinsonneault+ (2012, J/ApJS/199/30).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 I8 --- KIC [1160789/12735580] Kepler Input Catalog ID 10- 13 I4 K Teff [3942/6875] Effective temperature (1) 15- 17 I3 K e_Teff [44/110] Uncertainty in Teff (1) 19- 23 F5.3 [cm/s] logg [1.1/4.6] Log of surface gravity (2) 25- 29 F5.3 [cm/s] e_logg [0.003/0.2] Uncertainty in logg (2) 31- 36 F6.3 [Sun] feh [-2.3/0.5] Metallicity, [Fe/H] (1) 38- 42 F5.3 [Sun] e_feh [0.06/0.2] Uncertainty in feh (1) 44- 49 F6.3 Rsun r-dir [0.7/55.3] Stellar radius, direct method 51- 56 F6.3 Rsun E_r-dir [0.01/20.4] Upper uncertainty in r-dir 58- 63 F6.3 Rsun e_r-dir [0.01/20.4] Lower uncertainty in r-dir 65- 68 I4 pc d-dir [20/5019] Distance, direct method 70- 73 I4 pc E_d-dir [1/1665] Upper uncertainty in d-dir 75- 78 I4 pc e_d-dir [1/1665] Lower uncertainty in d-dir 80- 84 F5.3 mag av-dir [0/1.3] Extinction, direct method 86- 91 F6.3 Rsun r-dir-cor [0.7/54.4] Stellar radius, dnu corrected direct method 93- 98 F6.3 Rsun E_r-dir-cor [0.01/19.6] Upper uncertainty in r-dir-cor 100-105 F6.3 Rsun e_r-dir-cor [0.01/19.6] Lower uncertainty in r-dir-cor 107-110 I4 pc d-dir-cor [21/4754] Distance, dnu corrected direct method 112-115 I4 pc E_d-dir-cor [1/1478] Upper uncertainty in d-dir-cor 117-120 I4 pc e_d-dir-cor [1/1478] Lower uncertainty in d-dir-cor 122-126 F5.3 mag av-dir-cor [0/1.3] Extinction, dnu corrected direct method 128-134 F7.3 Rsun r-grid [0.7/62]?=-99 stellar radius, grid modeling 136-142 F7.3 Rsun E_r-grid [0/11]?=-99 Upper uncertainty in r-grid 144-150 F7.3 Rsun e_r-grid [0/12]?=-99 Lower uncertainty in r-grid 152-155 I4 pc d-grid [20/5244]?=-99 distance, grid modeling 157-159 I3 pc E_d-grid [0/570]?=-99 Upper uncertainty in d-grid 161-163 I3 pc e_d-grid [0/894]?=-99 Lower uncertainty in d-grid 165-171 F7.3 mag av-grid [-0.3/0.9]?=-99 extinction, grid modeling 173-179 F7.3 mag E_av-grid [0/0.4]?=-99 Upper uncertainty in av-grid 181-187 F7.3 mag e_av-grid [0/0.3]?=-99 Lower uncertainty in av-grid 189-195 F7.3 Rsun r-grid-cor [0.7/63]?=-99 stellar radius, dnu corrected grid modeling 197-203 F7.3 Rsun E_r-grid-cor [0/11]?=-99 Upper uncertainty in r-grid-cor 205-211 F7.3 Rsun e_r-grid-cor [0/12]?=-99 Lower uncertainty in r-grid-cor 213-216 I4 pc d-grid-cor [20/5161]?=-99 distance, dnu corrected grid modeling 218-220 I3 pc E_d-grid-cor [0/624]?=-99 Upper uncertainty in d-grid-cor 222-224 I3 pc e_d-grid-cor [0/879]?=-99 Lower uncertainty in d-grid-cor 226-232 F7.3 mag av-grid-cor [-0.3/0.9]?=-99 extinction, dnu corrected grid modeling 234-240 F7.3 mag E_av-grid-cor [0/0.4]?=-99 Upper uncertainty in av-grid-cor 242-248 F7.3 mag e_av-grid-cor [0/0.4]?=-99 Lower uncertainty in av-grid-cor 250-256 F7.3 Rsun r-gaia [0.5/120]?=-99 stellar radius, Gaia parallax based 258-264 F7.3 Rsun E_r-gaia [0.02/114]?=-99 Upper uncertainty in r-gaia 266-272 F7.3 Rsun e_r-gaia [0.02/65]?=-99 Lower uncertainty in r-gaia 274-277 I4 pc d-gaia [21/9616]?=-99 distance, Gaia parallax based 279-282 I4 pc E_d-gaia [0/5818]?=-99 Upper uncertainty in d-gaia 284-287 I4 pc e_d-gaia [0/5098]?=-99 Lower uncertainty in d-gaia 289-295 F7.3 mag av-gaia [-0.01/4.2]?=-99 extinction, Gaia parallax based 297-298 I2 --- Ev [-1/1]? Evolutionary state (3) 300-302 A3 --- Src Source flag (4)
Note (1): Teff and feh were taken from APOGEE DR13 (SDSS Collaboration 2016arXiv160802013S) for giants (src flag = 'apo') and from Buchave & Latham (2015, J/ApJ/808/187) for dwarfs and subgiants (src flag = 'spc'). See section 2 for details. Note (2): logg was calculated from teff and numax given in Table 1. Note (3): Evolutionary state classifications taken from Stello+ (2013, J/ApJ/765/L41) and Vrard+ (2016, J/A+A/588/A87) as follows: 0 = non He-core burning stars; 1 = He-core burning stars; -1 = stars with unknown evolutionary state.. Note (4): Source flag as follows: apo = APOGEE DR13, (SDSS Collaboration et al. 2016arXiv160802013S) spc = Stellar Parameter Classification pipeline, Buchave & Latham (2015, J/ApJ/808/187).
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 05-Mar-2018
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