J/ApJ/874/97 Chemical abundances from APOGEE. II. M67 stars (Souto+, 2019)
Chemical abundances of main-sequence, turnoff, subgiant, and red giant stars
from APOGEE spectra.
II. Atomic diffusion in M67 stars.
Souto D., Allende Prieto C., Cunha K., Pinsonneault M., Smith V.V.,
Garcia-Dias R., Bovy J., Garcia-Hernandez D.A., Holtzman J., Johnson J.A.,
Jonsson H., Majewski S.R., Shetrone M., Sobeck J., Zamora O., Pan K.,
Nitschelm C.
<Astrophys. J., 874, 97-97 (2019)>
=2019ApJ...874...97S 2019ApJ...874...97S (SIMBAD/NED BibCode)
ADC_Keywords: Spectra, infrared; Radial velocities; Abundances; Proper motions;
Optical; Stars, distances; Effective temperatures; Stars, masses;
Clusters, open; Stars, giant
Keywords: diffusion; infrared: stars; open clusters and associations: general
stars: abundances
Abstract:
Chemical abundances for 15 elements (C, N, O, Na, Mg, Al, Si, K, Ca,
Ti, V, Cr, Mn, Fe, and Ni) are presented for 83 stellar members of the
4Gyr old solar-metallicity open cluster M67. The sample contains stars
spanning a wide range of evolutionary phases, from G dwarfs to red
clump stars. The abundances were derived from near-IR
(λ1.5-1.7µm) high-resolution spectra (R=22500) from the
SDSS-IV/Apache Point Observatory Galactic Evolution Experiment
(APOGEE) survey. A 1D local thermodynamic equilibrium abundance
analysis was carried out using the APOGEE synthetic spectral
libraries, via χ2 minimization of the synthetic and observed
spectra with the qASPCAP code. We found significant abundance
differences (∼0.05-0.30dex) between the M67 member stars as a function
of the stellar mass (or position on the Hertzsprung-Russell diagram),
where the abundance patterns exhibit a general depletion (in [X/H]) in
stars at the main-sequence turnoff. The amount of the depletion is
different for different elements. We find that atomic diffusion models
provide, in general, good agreement with the abundance trends for most
chemical species, supporting recent studies indicating that measurable
atomic diffusion operates in M67 stars.
Description:
The APOGEE spectrographs are cryogenic multifiber near-infrared
instruments covering the H band between λ1.51um and
λ1.69um, obtaining high-resolution (R∼22500) spectra for
300 objects at a time. The spectrographs are currently mounted in both
hemispheres on 2.5m telescopes at APO (Apache Point Observatory, New
Mexico, USA) and at LCO (Las Campanas Observatory, La Serena, Chile).
APOGEE is part of the SDSS-III and SDSS-IV projects, and M67 is one of
the calibration clusters for the ASPCAP pipeline. APOGEE has observed
a dedicated field in the direction of M67 (location ID 4162),
obtaining spectra for 563 targets. The stars had multiple visits,
generally more than three, to reach the required signal-to-noise ratio
(S/N) of the combined spectra (higher than ∼100 per half a resolution
element).
Objects:
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RA (ICRS) DE Designation(s)
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08 51 23.04 +11 48 50.4 M67 = NGC 2682
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 115 110 Stellar properties
table2.dat 76 110 Stellar parameters
table3.dat 115 110 Stellar abundances
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
I/329 : URAT1 Catalog (Zacharias+ 2015)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
J/A+A/360/499 : Equivalent widths of 9 stars of M 67 (Tautvaisiene+, 2000)
J/A+A/484/609 : BVI photometry and proper motions in M67 (Yadav+, 2008)
J/A+A/490/777 : Abundances of Population II stars in NGC 6397 (Lind+, 2008)
J/A+A/497/497 : Physical parameters from JHK flux (Gonzalez-Hernandez+, 2009)
J/AJ/138/184 : RR Lyrae var. in 2 fields in M31 spheroid (Sarajedini+, 2009)
J/A+A/508/833 : SACY III. Li abundances (da Silva+, 2009)
J/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010)
J/AJ/142/59 : Chemical abundance in 10 open clusters (Jacobson+, 2011)
J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)
J/ApJ/751/156 : Ti and Fe lines in red supergiants (Bergemann+, 2012)
J/A+A/543/A108 : Grid of stellar models, asteroseismology (Lagarde+, 2012)
J/AJ/146/133 : Stellar parameters from SDSS-III APOGEE DR10 (Meszaros+, 2013)
J/A+A/562/A92 : Li abundance in solar analogues (Delgado Mena+, 2014)
J/AJ/150/97 : RVs in M67. I. 1278 candidate members (Geller+, 2015)
J/ApJS/221/24 : SDSS-III APOGEE H-band spectral line lists (Shetrone+, 2015)
J/MNRAS/456/3655 : Masses and ages of red giants (Martig+, 2016)
J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016)
J/ApJ/823/114 : The Cannon: a new approach to determine masses (Ness+, 2016)
J/MNRAS/463/696 : M67 solar twins chemical compositions (Liu+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- OT Object type (G1)
6 A1 --- Rej e: excluded sample due to low S/N (<100)
8- 25 A18 --- Name APOGEE name (2MHHMMSSss+DDMMSSs; J2000)
27- 31 F5.2 km/s RV [31/36.3] Radial velocity from DR14
33- 37 F5.2 km/s e_RV [0.01/31] RV uncertainty
39- 44 F6.2 mas/yr pmRA [-12/-10.3] Gaia DR2 proper motion in RA
46- 49 F4.2 mas/yr e_pmRA [0.04/0.2] pmRA uncertainty
51- 55 F5.2 mas/yr pmDE [-4/-2] Gaia DR2 proper motion in declination
57- 60 F4.2 mas/yr e_pmDE [0.03/0.2] pmDE uncertainty
62- 67 F6.2 pc Dist [784/949] Bailer-Jones+ 2018 distance
69- 73 F5.2 pc e_Dist [12/58]? Dist uncertainty
75- 78 I4 --- S/N [52/1445] Signal-to-noise ratio from DR14
80- 81 I2 --- pG15 [3/99]? Membership probability
(Geller+ 2015, J/AJ/150/97)
83- 85 I3 --- pY08 [0/100]? Membership probability
(Yadav+ 2008, J/A+A/484/609)
87- 88 I2 --- pZ93 [0/99]? Membership probability
(Zhao+ 1993A&AS..100..243Z 1993A&AS..100..243Z)
90- 91 I2 --- pG89 [0/99]? Membership probability
(Girard+ 1989AJ.....98..227G 1989AJ.....98..227G)
93- 94 I2 --- pS77 [0/99]? Membership probability
(Sanders 1977A&AS...27...89S 1977A&AS...27...89S)
96- 101 F6.3 mag Jmag [7.2/14] 2MASS J-band magnitude
103- 108 F6.3 mag Hmag [6.5/13.5] 2MASS H-band magnitude
110- 115 F6.3 mag Ksmag [6.3/13.3] 2MASS Ks-band magnitude
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- OT Object type (G1)
6 A1 --- Rej e: excluded sample due to low S/N (<100)
8- 25 A18 --- Name APOGEE name (2MHHMMSSss+DDMMSSs; J2000)
27- 32 F6.1 K Teff [4190/7985.2] Effective temperature, ASCAP raw
34- 40 F7.1 K Teffc [4302/7647.2]?=-9999 Teff, ASCAP calibrated
42- 47 F6.1 K TGB09 [4274/7687] Effective temperature, GB09
49- 52 F4.2 [cm/s2] logg [1.6/4.7] Log of surface gravity, ASCAP raw
54- 61 F8.2 [cm/s2] loggc [1.6/3.7]?=-9999 logg, ASCAP calibrated
63- 66 F4.2 [cm/s2] loggP [1.7/4.8] logg, physical
68- 71 F4.2 Msun Mass [0.7/1.4] Mass isochrone
73- 76 F4.2 km/s xi [0.5/3] Microturbulent velocity, ξ, ASCAP raw
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- OT Object type (G1)
6 A1 --- Rej e: excluded sample due to low S/N (<100)
8- 25 A18 --- Name APOGEE name (2MHHMMSSss+DDMMSSs; J2000)
27- 31 F5.2 [Sun] [Fe/H] [-1.71/0.16] Fe/H abundance
33- 37 F5.2 [Sun] [C/H] [-0.72/0.07] C/H abundance
39- 43 F5.2 [Sun] [N/H] [-0.26/0.7]? N/H abundance
45- 49 F5.2 [Sun] [O/H] [-1/0.34]? O/H abundance
51- 55 F5.2 [Sun] [Na/H] [-2.5/0.72]? Na/H abundance
57- 61 F5.2 [Sun] [Mg/H] [-2.21/0.26] Mg/H abundance
63- 67 F5.2 [Sun] [Al/H] [-1.8/0.5] Al/H abundance
69- 73 F5.2 [Sun] [Si/H] [-2.21/0.34] Si/H abundance
75- 79 F5.2 [Sun] [K/H] [-1.23/0.22] K/H abundance
81- 85 F5.2 [Sun] [Ca/H] [-1.53/0.6] Ca/H abundance
87- 91 F5.2 [Sun] [Ti/H] [-2.21/0.5] Ti/H abundance
93- 97 F5.2 [Sun] [V/H] [-2.5/0.8] V/H abundance
99- 103 F5.2 [Sun] [Cr/H] [-2.4/0.2]? Cr/H abundance
105- 109 F5.2 [Sun] [Mn/H] [-1.21/0.54] Mn/H abundance
111- 115 F5.2 [Sun] [Ni/H] [-1.4/0.16] Ni/H abundance
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Global notes:
Note (G1): Object type as follows:
red = Red giant
sub = subgiant
turn = turnoff
MS = main sequence
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History:
From electronic version of the journal
References:
Souto et al. Paper I. 2018ApJ...857...14S 2018ApJ...857...14S
(End) Emmanuelle Perret [CDS] 23-Oct-2023