J/AJ/167/50 The APO-K2 Catalog. I. 7672 Red giants (Schonhut-Stasik+, 2024)
The APO-K2 Catalog.
I. ∼7500 Red Giants with Fundamental Stellar Parameters from APOGEE DR17
Spectroscopy and K2-GAP Asteroseismology.
Schonhut-Stasik J., Zinn J.C., Stassun K.G., Pinsonneault M.,
Johnson J.A., Warfield J.T., Stello D., Elsworth Y., Garcia R.A.,
Mathur S., Mosser B., Hon M., Tayar J., Stringfellow G.S., Beaton R.L.,
Jonsson H., Minniti D.
<Astron. J., 167, 50 (2024)>
=2024AJ....167...50S 2024AJ....167...50S
ADC_Keywords: Stars, giant; Optical; Stars, masses; Stars, diameters;
Effective temperatures; Parallaxes, trigonometric; Abundances;
Keywords: Galactic archaeology ; Stellar astronomy ; Asteroseismology ;
Spectroscopy ; Stellar kinematics
Abstract:
We present a catalog of fundamental stellar properties for ∼7500
evolved stars, including stellar radii and masses, determined from the
combination of spectroscopic observations from the Apache Point
Observatory Galactic Evolution Experiment, part of the Sloan Digital
Sky Survey IV, and asteroseismology from K2. The resulting APO-K2
catalog provides spectroscopically derived temperatures and
metallicities, asteroseismic global parameters, evolutionary states,
and asteroseismically derived masses and radii. Additionally, we
include kinematic information from Gaia. We investigate the
multidimensional space of abundance, stellar mass, and velocity with
an eye toward applications in Galactic archaeology. The APO-K2 sample
has a large population of low-metallicity stars (∼288 with [M/H]≲-1),
and their asteroseismic masses are larger than astrophysical
estimates. We argue that this may reflect offsets in the adopted
fundamental temperature scale for metal-poor stars rather than
metallicity-dependent issues with interpreting asteroseismic data. We
characterize the kinematic properties of the population as a function
of α enhancement and position in the disk and identify those
stars in the sample that are candidate components of the
Gaia-Enceladus merger. Importantly, we characterize the selection
function for the APO-K2 sample as a function of metallicity, radius,
mass, νmax, color, and magnitude referencing Galactic simulations
and target selection criteria to enable robust statistical inferences
with the catalog.
Description:
In this paper we summarize the APO-K2 evolved star sample, with
corresponding spectroscopic (APOGEE DR17), asteroseismic (K2-GAP), and
astrometric (Gaia DR3) parameters. Our sample of 7672 unique stars
contains RGB, RC, secondary RC, and RGB bump evolutionary states, from
various areas of the Galaxy.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalog.dat 451 7672 The APO-K2 catalog (table 1 to 4)
--------------------------------------------------------------------------------
See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)
J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)
J/AJ/128/1177 : Galactic stellar abundances (Venn+, 2004)
J/A+A/497/497 : Physical parameters from JHKflux (Gonzalez-Hernandez+, 2009)
J/AJ/146/133 : Star parameters from SDSS-III APOGEE DR10 (Meszaros+, 2013)
J/ApJ/765/L41 : Asteroseismic classification of KIC objects (Stello+, 2013)
J/ApJS/215/19 : APOKASC catalog of Kepler red giants (Pinsonneault+, 2014)
J/AJ/151/144 : ASPCAP weights for 15 APOGEE chemical elem (Garcia+, 2016)
J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)
J/ApJ/835/83 : K2 GAP data release. I. Campaign 1 (Stello+, 2017)
J/A+A/618/A109 : Seismic global parameters of 372 KIC (Mosser+, 2018)
J/ApJS/239/32 : APOKASC-2 Kepler evolved stars (Pinsonneault+, 2018)
J/MNRAS/475/5487 : Stellar properties of KIC stars (Silva Aguirre+, 2018)
J/MNRAS/475/3633 : Mass and age of red giant branch stars (Wu+, 2018)
J/ApJS/236/42 : Asteroseismology of ∼16000 Kepler red giants (Yu+, 2018)
J/MNRAS/489/176 : Dynamical heating across Milky Way disc (Mackereth+, 2019)
J/ApJ/887/203 : Core rotation period measurements KIC stars (Tayar+, 2019)
J/A+A/627/A173 : Abundances for 4 metal-poor stars (Valentini+, 2019)
J/MNRAS/491/3251 : Globular clusters in inner Galaxy (Perez-Villegas+, 2020)
J/ApJS/251/23 : K2 GAP DR2; campaigns 4, 6 & 7 (Zinn+, 2020)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
J/ApJ/919/131 : Oscillating red giants from the TESS QLP (Hon+, 2021)
J/MNRAS/502/1947 : Giant stars in TESS continuous view zones (Mackereth+, 2021)
J/ApJ/912/72 : High-res. spectro for 26 halo KIC stars (Matsuno+, 2021)
J/A+A/645/A85 : Age dissection of the Milky Way discs (Miglio+, 2021)
J/other/NatAs/5.640 : MW chronological dating early assembly (Montalban+, 2021)
J/AJ/161/100 : Ages & alpha-abundances population in K2 (Warfield+, 2021)
J/AJ/161/231 : A list of ∼330000 stars Kepler missed (Wolniewicz+, 2021)
J/AJ/164/135 : 1709 red giants fundamental asteroseismic param (Hon+, 2022)
J/ApJ/926/191 : K2 Galactic Archaeology Program DR3, final (Zinn+, 2022)
J/A+A/677/A21 : Asteroseismic distances 12500 red-giant stars (Khan+, 2023)
Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- EPIC EPIC identifier
11- 28 A18 --- APOGEE APOGEE identifier
30- 48 I19 --- Gaia Gaia DR3 identifier
50- 58 A9 --- Camp K2 campaign number(s)
60- 67 F8.4 deg RAdeg [8/360] Right Ascension (J2000)
69- 76 F8.4 deg DEdeg [-31/28] Declination (J2000)
78- 83 F6.2 deg GLAT [-67/66] Galactic latitude
85- 90 F6.2 deg GLON [0/360] Galactic longitude
92- 94 A3 --- Evol Derived evolutionary state (1)
96- 99 I4 K Teff [3726/6232] APOGEE calibrated
effective temperature
101-103 I3 K e_Teff [4/706] Uncertainty in Teff
105-109 F5.3 [cm/s2] logg [0.9/4.62] APOGEE calibrated log
surface gravity
111-115 F5.3 [cm/s2] e_logg [0.01/2] Uncertainty in logg
117-123 F7.4 [Sun] [M/H] [-2.43/0.53]? APOGEE log metal
abundance relative to Hydrogen
125-130 F6.4 [Sun] e_[M/H] [0.005/0.4]? Uncertainty in [M/H]
132-138 F7.4 [Sun] [Fe/H] [-2.45/0.51] APOGEE log Iron
abundance relative to Hydrogen
140-145 F6.4 [Sun] e_[Fe/H] [0.006/0.2] Uncertainty in [Fe/H]
147-153 F7.4 [Sun] [a/M] [-0.49/0.78]? APOGEE log
α-element/Metal abundance ratio
155-160 F6.4 [Sun] e_[a/M] [0.003/0.6]? Uncertainty in [a/M]
162-163 I2 --- aFlag [-1/1] The α flag; see
section 3.2
165-170 F6.3 mag Vmag [7.02/17.5] Apparent V band Vega
magnitude (2)
172-176 F5.3 mag e_Vmag [0.6/6] Uncertainty in Vmag (2)
178-183 F6.3 mag Jmag [5.14/14.4] EPIC Apparent J band
magnitude
185-189 F5.3 mag e_Jmag [0.01/0.07] Uncertainty in Jmag
191-196 F6.3 mag Ksmag [4.48/13.8] EPIC Apparent Ks band
magnitude
198-202 F5.3 mag e_Ksmag [0.01/0.08] Uncertainty in Ksmag
204-208 F5.3 mag J-Ks [0.46/1.43] EPIC (J-Ks) color
210-214 F5.3 mag e_J-Ks [0.02/0.09] Uncertainty in J-Ks
216-222 F7.3 uHz numax [3.65/258] Frequency of maximum
power (3)
224-228 F5.3 uHz e_numax [0.001/4] Uncertainty in numax
230-235 F6.3 uHz deltanu [0.96/18.1]? Large frequency
separation
237-241 F5.3 uHz e_deltanu [0/0.4]? Uncertainty in deltanu
243-248 F6.4 uHz fdeltanu [0.85/1.07]? The δν
correction factor
250-255 F6.4 uHz e_fdeltanu [0/0.09]? Uncertainty in fdeltanu
257-257 I1 --- f_fdeltanu [0/2] Flag on fdeltanu (4)
259-263 F5.3 --- kappaM [0.44/5.54]? Asteroseismic mass
coefficient
265-269 F5.3 --- e_kappaM [0.003/1.96]? Uncertainty in kappaM
271-275 F5.3 Msun Mass [0.28/4.49]? Stellar mass
277-281 F5.3 Msun e_Mass [0.005/1.99]? Uncertainty in Mass
283-288 F6.3 --- kappaR [4.1/43.7]? Asteroseismic radius
coefficient
290-295 F6.3 --- e_kappaR [0.005/10.9]? Uncertainty in kappaR
297-302 F6.3 Rsun Rad* [3.75/39.9]? Stellar radius
304-308 F5.3 Rsun e_Rad* [0.006/10]? Uncertainty in Radius
310-315 F6.3 mas plx [-0.3/18]? Gaia DR3 parallax (5)
317-321 F5.3 mas e_plx [0.01/0.7]? Uncertainty in plx
323-331 F9.4 --- e ?=-999 Galactic eccentricity
333-341 F9.4 --- e_e ?=-999 Uncertainty in e
343-351 F9.4 kpc Zmax ? Maximum excursion from the
Galactic plane
353-361 F9.4 kpc e_Zmax ?=-999 Uncertainty in Zmax
363-371 F9.4 10+3.kpc.km/s AMom ?=-999 Orbital angular momentum
373-381 F9.4 10+3.kpc.km/s e_AMom ?=-999 Uncertainty in AMom
383-391 F9.4 10+5.km2/s2 ETot Total orbital energy
393-401 F9.4 10+5.km2/s2 e_ETot ?=-999 Uncertainty in ETot
403-409 F7.2 km/s U The U velocity
411-417 F7.2 km/s e_U ?=-999 Uncertainty in U
419-425 F7.2 km/s V The V velocity
427-433 F7.2 km/s e_V ?=-999 Uncertainty in V
435-441 F7.2 km/s W The W velocity
443-449 F7.2 km/s e_W ?=-999 Uncertainty in W
451-451 I1 --- DR3 [0/1] Gaia DR3 binary flag (6)
--------------------------------------------------------------------------------
Note (1): States as follows:
RC = red clump star (2465 occurrences)
RGB = red giant branch star (5207 occurrences)
Note (2): Calculated from Equation 5 with the error calculated using
standard propagation of uncertainty.
Note (3): Note that the ?? values provided here have already had the
fdeltanu applied and therefore are not needed in Equations 1 and 2.
Note (4): An integer value of 0 indicates no issue with the calculation, an
integer value of 1 indicates that fdeltanu is computed by
extrapolating beyond the bounds of the fdeltanu grid, and an integer
value of 2 indicates that fdeltanu could not be computed due
to a lack of deltanu.
Note (5): Corrected according to the Gaia zero point, evaluated using
the Python implementation of the Lindegren+, 2021A&A...649A...4L 2021A&A...649A...4L
correction, and uncertainties (according to El-Badry+,
2021MNRAS.506.2269E 2021MNRAS.506.2269E).
Note (6): Nonzero if either of the following are true: the star is
flagged in the nonsinglestar column of DR3 or the fidelity_v2 value
from Rybizki+, 2022MNRAS.510.2597P 2022MNRAS.510.2597P is ≤ 0.5 or unavailable.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
(End) Prepared by [AAS], Coralie Fix [CDS], 26-Apr-2024