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APO-K2

Welcome to the companion GitHub to the APO-K2 Catalog Release.

NB: The APO-K2 paper is current in submission and these numbers might be liable to change with improvements to the catalog. The current version of the PDF for the catalog can be found here: https://www.jessicastasik.com/_files/ugd/7c73a7_9cf838f60fe945e4b0342d8d4115c1f7.pdf

The selection function file contains its own README file describing how to use the selection function products.

The publically available APO-K2 catalog is named in this directory as 'apo_k2_public_catalog.csv' and below is a detailed breakdown of each of the columns.

Column Unit Data Type Description
epic dimensionless int EPIC ID from the EPIC catalog.
apogee dimensionless string APOGEE ID from APOGEE DR17.
gaia_source dimensionless numpy Gaia EDR3 source ID.
camp dimensionless string Campaign number of the observation.[1]
ra degrees float Right Ascension from the EPIC catalog.
dec degrees float Declination from the EPIC catalog.
glat degrees float Galactic Latitude of the target.
glon degrees float Galactic Longitude of the target.
ev dimensionless string The Evolutionary State of the target.
teff kelvin float Calibrated effective temperature from APOGEE.
teff_err kelvin float Error on the APOGEE effective temperature.
logg dex float Calibratred surface gravity of target.
logg_err dex float Error on surface gravity.
meh dex float [M/H] from APOGEE.
meh_err dex float [M/H] error from APOGEE.
feh dex float [Fe/H] from APOGEE.
feh_err dex float [Fe/H] error from APOGEE.
alpham dex float [Alpha/M] from APOGEE.
alpham_err dex float [Alpha/M] error from APOGEE.
alpha_flags dimensionless int Flag depicting high- or low-alpha targets. [2]
vmag mag float V-band magnitude.
vmag_err mag float V-band magnitude error.
jmag mag float J-band magnitude.
jmag_err mag float J-band magnitude error.
kmag mag float K-band magnitude.
kmag_err mag float K-band magnitude error.
jk mag float J-K color.
j_k_err mag flat J-K color error.
numax microhertz float Frequency of maximum oscillation power derived from K2 asteroseismology.
numax_err microhertz float Error on the frequency of maximum oscillation power derived from K2 asteroseismology.
dnu microhertz float Large frequency separation devived from K2 asteroseismology.
dnu_err microhertz float Error on the large frequency separation derived from K2 asteroseismology.
fdnu dimensionless float Large frequency correction.
fdnu_err dimensionless float Error on the large frequency correction.
fdnu_flags dimensionless float Flag on fdnu. [3]
kappa_m dimensionless float Mass coefficient.
kappa_m_err dimensionless float Error on mass coefficient.
mass M${_\odot}$ float Asteroseismically-derived mass.
mass_err M${_\odot}$ float Error on mass.
kappa_r dimensionless float Radius coefficient.
kappa_r_err dimensionless float Error on radius coefficient.
radius R${_\odot}$ float Asteroseismically-derived radius.
radius_err R${_\odot}$ float Error on radius.
para mas float Corrected parallax from Gaia DR3.
para_err mas float Error on corrected parallax from Gaia DR3.
ecc dimensionless float Galactic eccentricity of the target. [4]
ecc_err dimensionless float Error on galactic eccentricity of the target. [4]
zmax kpc float Greatest distance of target from the Galactic plane during orbit. [4]
zmax_err kpc float Error on zmax [4]
ang_mom kpc km s$^{-1}$ float Angular momentum. [4]
ang_mom_err kpc km s$^{-1}$ float Error on angular momentum. [4]
tot_energy km$^2$ s$^{-2}$ float Total energy. [4]
tot_energy_err km$^2$ s$^{-2}$ float Error on total energy. [4]
u km s$^{-1}$ float Positive velocity towards the Galactic center. [4]
u_err km s$^{-1}$ float Error on U. [4]
v km s$^{-1}$ float Positive velocity towards the direction of Galactic rotation. [4]
v_err km s$^{-1}$ float Error on V. [4]
w km s$^{-1}$ float Positive velocity towards the North Galactic Pole. [4]
w_err km s$^{-1}$ float Error on W. [4]
gaia_binary_flag numpy float Binary flag from Gaia DR3. [4]

[1] If this target was observed in multiple campaigns, these are contained in a list for the target's row.

[2] A value of 0 is $\alpha$-poor, and a value of 1 is $\alpha$-rich. Stars falling within $2\sigma$ of this ridge-line are given a value of -1. See Warfield et al. (2024)

[3] The second flag pertains to the $f_{\Delta\nu}$, where 0.0 corresponds $f_{\Delta\nu}$ value within the bounds of the grid and with a complete [Fe/H], the value is 1.0 if the value is computed by extrapolating beyond the bounds of the $f_{\Delta\nu}$ grid, and 2.0 if there is incomplete [Fe/H], T$_{\mathrm{eff}}$, $\nu_{\mathrm{max}}$, or $\Delta\nu$ information to compute $f_{\Delta\nu}$.

[4] For stars in these columns without data a float value of -999.0 is used and should be removed by the user.

[5] This flag will be nonzero if either of the following are true: the star is flagged in the $\texttt{non\_single\_star}$ column of DR3 or the $\texttt{fidelity\_v2}$ value from Rybizki et al. (2022) (https://arxiv.org/abs/2101.11641) is $\leq$ 0.5 or unavailable.

For any questions, comments, or problems please contact the lead author Jessica Schonhut-Stasik at [email protected]. Accessible text and other additional information can be found at https://www.jessicastasik.com/apo-k2.