J/MNRAS/491/544 NGC752 abundances from IR spectra (Bocek Topcu+, 2020)
Chemical abundances of open clusters from high-resolution infrared spectra.
II. NGC 752.
Bocek Topcu G., Afsar M., Sneden C., Pilachowski C.A., Denissenkov P.A.,
Vandenberg D.A., Wright D., Mace G.N., Jaffe D.T., Strickland E., Kim H.,
Sokal K.R.
<Mon. Not. R. Astron. Soc., 491, 544-559 (2020)>
=2020MNRAS.491..544B 2020MNRAS.491..544B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Clusters, open ; Abundances ; Spectra, infrared ;
Radial velocities ; Proper motions ; Photometry ; Optical
Keywords: stars: abundances - stars: atmospheres -
open clusters and associations: individual: NGC 752
Abstract:
We present a detailed near-infrared chemical abundance analysis of 10
red giant members of the Galactic open cluster NGC 752.
High-resolution (R∼45000) near-infrared spectral data were gathered
with the Immersion Grating Infrared Spectrograph, providing
simultaneous coverage of the complete H and K bands. We derived the
abundances of H-burning (C, N, O), α(Mg, Si, S, Ca), light odd-Z
(Na, Al, P, K), Fe-group (Sc, Ti, Cr, Fe, Co, Ni), and neutron-capture
(Ce, Nd, Yb) elements. We report the abundances of S, P, K, Ce, and Yb
in NGC 752 for the first time. Our analysis yields solar-metallicity
and solar abundance ratios for almost all of the elements heavier than
the CNO group in NGC 752. O and N abundances were measured from a
number of OH and CN features in the H band, and C abundances were
determined mainly from CO molecular lines in the K band.
High-excitation CI lines present in both near-infrared and optical
spectra were also included in the C abundance determinations. Carbon
isotopic ratios were derived from the R-branch band heads of first
overtone (2-0) and (3-1) 12CO and (2-0) 13CO lines near 23440Å
and (3-1) 13CO lines at about 23730Å. The CNO abundances and
12C/13C ratios are all consistent with our giants having completed
'first dredge-up' envelope mixing of CN-cycle products. We
independently assessed NGC752 stellar membership from Gaia astrometry,
leading to a new colour-magnitude diagram for this cluster.
Applications of Victoria isochrones and MESA models to these data
yield an updated NGC752 cluster age (1.52Gyr) and evolutionary stage
indications for the programme stars. The photometric evidence and
spectroscopic light element abundances all suggest that the most,
perhaps all of the programme stars are members of the helium-burning
red clump in this cluster.
Description:
We gathered IGRINS H- and K-band high-resolution spectra for the 10
NGC 752 RG members studied in the optical spectral region by Bocek
Topcu et al. (2015MNRAS.446.3562B 2015MNRAS.446.3562B, Cat. J/MNRAS/446/3562). The stars
chosen for that paper were selected from the RV membership catalogue
of Mermilliod et al. (2008A&A...485..303M 2008A&A...485..303M, Cat. J/A+A/485/303), before
the release of Gaia DR2 astrometric data. The membership analysis
presented here confirms that our targets belong to NGC 752.
Additionally, several stars not included here appear to be RG members
(this study and Twarog, private communication). Future spectroscopic
study of these stars would be welcome. The log of the IGRINS
observations is given in Table 2 along with the basic parameters of
programme stars. These stars are all red giants with similar
parameters, as indicated by spectroscopic analyses (Teff∼4900K,
logg∼2.7) and by photometric data [V∼9.2, MV1.0, (B-V)0∼0.97].
Three other stars with similar photometric characteristics satisfy our
NGC 752 membership criteria: BD+37 404 (MMU 2054), BD+36 328 (MMU
1533), and BD+37 422 (MMU 110, HD 11811).
Almost all of the observations were made with IGRINS installed at the
Cassegrain focus of the 2.7m Harlan J. Smith Telescope at McDonald
Observatory in 2015 December (Mace et al. 2016SPIE.9908E..0CM). One
object, MMU 1367, was observed with IGRINS on Lowell Observatory's
4.3m Discovery Channel Telescope (Mace et al. 2018SPIE10702E..0QM).
Objects:
------------------------------------------------------------------
RA (ICRS) DE Designation(s)
------------------------------------------------------------------
01 56 53.52 +37 47 38.4 NGC752 = C 0154+374 = Cl Melotte 12
------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 99 11 Kinematics and radial velocities
table2.dat 83 10 Basic parameters of the programme stars and
summary of IGRINS observations
table3.dat 75 10 Model atmosphere parameters and [Fe/H]
abundances from both wavelength regions
table4a.dat 167 12 Relative abundances and 12C/13C ratios of
NGC 752 RGs from optical data
table4b.dat 131 12 Relative abundances and 12C/13C ratios of
NGC 752 RGs from IGRINS H&K data
table5.dat 43 10 logε abundances of carbon in optical
and infrared regions
table6.dat 17 10 Carbon isotopic ratios of optical and infrared
regions
--------------------------------------------------------------------------------
See also:
J/MNRAS/446/3562 : Abundances of red giants in NGC752 (Bocek Topcu+, 2015)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name (MMU NNNN)
14- 31 I18 --- GaiaDR2 ? Gaia DR2 source identifier
33- 37 F5.3 mas plx ? Gaia DR2 parallax
39- 43 F5.3 mas e_plx ? Error on plx
45- 49 F5.3 mas/yr pmRA ? Gaia DR2 proper motion in right ascension
51- 55 F5.3 mas/yr e_pmRA ? Error on pmRA
57- 63 F7.3 mas/yr pmDE ? Gaia DR2 proper motion in declination
65- 69 F5.3 mas/yr e_pmDE ? Error on pmDE
71- 74 F4.2 km/s RV Radial velocity from this work
76- 79 F4.2 km/s e_RV Error on RV
81- 84 F4.2 km/s RVp1 Radial velocity from Paper I
(Bocek Topcu et al. 2019MNRAS.485.4625B 2019MNRAS.485.4625B)
86- 89 F4.2 km/s e_RVp1 Error on RVp1
91- 94 F4.2 km/s RVgaia ? Gaia DR2 radial velocity
96- 99 F4.2 km/s e_RVgaia ? Error on RVgaia
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Star name (MMU NNNN)
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 33 F5.2 arcsec DEs Declination (J2000)
35- 38 F4.2 mag Vmag V-band magnitude from
Daniel et al. (1994PASP..106..281D 1994PASP..106..281D,
Cat. J/PASP/106/281)
40- 43 F4.2 mag Hmag H-band magnitude from 2MASS
45- 48 F4.2 mag Kmag K-band magnitude from 2MASS
50- 53 F4.2 mag Gmag Gaia DR2 G magnitude
55- 58 F4.2 mag BP-RP Gaia DR2 BP-RP colour
60- 63 F4.2 mag B-V B-V colour index
65- 68 F4.2 mag V-K V-K colour index
70- 79 I10 "Y:M:D" Date Observation date of IGRINS observation
81- 83 I3 --- S/N Signal to noise ratio
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Star name (MMU NNNN)
10- 13 I4 K Teff Effective temperature
15- 18 I4 K Teffgaia Gaia DR2 Effective temperature
20- 23 I4 K TeffLDR Effective temperature from line-depth
ratio (LDR)
25- 28 F4.2 [cm/s2] logg Surface gravity
30- 33 F4.2 km/s vt Microturbulent velocity
35- 39 F5.2 [-] [FeI/H] FeI to hydrogen optical abundance ratio
41- 44 F4.2 [-] e_[FeI/H] Error on [FeI/H]
46- 47 I2 --- o_[FeI/H] Number of lines used to determine [FeI/H]
49- 53 F5.2 [-] [FeII/H] FeII to hydrogen optical abundance ratio
55- 58 F4.2 [-] e_[FeII/H] Error on [FeII/H]
60- 61 I2 --- o_[FeII/H] Number of lines used to determine [FeII/H]
63- 67 F5.2 [-] [FeI/H]IR FeI to hydrogen IR abundance ratio
69- 72 F4.2 [-] e_[FeI/H]IR Error on [FeI/H]IR
74- 75 I2 --- o_[FeI/H]IR Number of lines used to determine [FeI/H]IR
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4a.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name
14- 17 F4.2 [-] [NaI/Fe] NaI/Fe abundance ratio Nmax=4
19- 23 F5.2 [-] [MgI/Fe] MgI/Fe abundance ratio N_max=2
25- 29 F5.2 [-] [AlI/Fe] AlI/Fe abundance ratio N_max=2
31- 34 F4.2 [-] [SiI/Fe] SiI/Fe abundance ratio N_max=15
36- 40 F5.2 [-] [SI/Fe] SI/Fe abundance ratio N_max=2 (1)
42- 45 F4.2 [-] [KI/Fe] KI/Fe abundance ratio N_max=1 (1)
47- 50 F4.2 [-] [CaI/Fe] CaI/Fe abundance ratio N_max=10
52- 55 F4.2 [-] [ScII/Fe] ScII/Fe abundance ratio N_max=6 (1)
57- 61 F5.2 [-] [TiI/Fe] TiI/Fe abundance ratio N_max=11
63- 66 F4.2 [-] [TiII/Fe] TiII/Fe abundance ratio N_max=4
68- 72 F5.2 [-] [VI/Fe] VI/Fe abundance ratio N_max=12
74- 78 F5.2 [-] [CrI/Fe] CrI/Fe abundance ratio N_max=14
80- 83 F4.2 [-] [CrII/Fe] CrII/Fe abundance ratio N_max=3
85- 89 F5.2 [-] [MnI/Fe] MnI/Fe abundance ratio N_max=3
91- 95 F5.2 [-] [CoI/Fe] CoI/Fe abundance ratio N_max=5
97-100 F4.2 [-] [NiI/Fe] NiI/Fe abundance ratio N_max=29
102-106 F5.2 [-] [CuI/Fe] CuI/Fe abundance ratio N_max=1
108-112 F5.2 [-] [ZnI/Fe] ZnI/Fe abundance ratio N_max=1
114-118 F5.2 [-] [YII/Fe] YII/Fe abundance ratio N_max=4
120-123 F4.2 [-] [LaII/Fe] LaII/Fe abundance ratio N_max=4
125-128 F4.2 [-] [CeII/Fe] CeII/Fe abundance ratio N_max=4 (1)
130-133 F4.2 [-] [NdII/Fe] NdII/Fe abundance ratio N_max=3
135-138 F4.2 [-] [EuII/Fe] EuII/Fe abundance ratio N_max=2
140 A1 --- l_loge(Li) Limit flag on loge(Li)
142-145 F4.2 [-] loge(Li) ? logε(Li) abundance N_max=1
147-150 F4.1 --- 12C/13C 12C/13C isotopic ratio (CN features)
152-156 F5.2 [-] [C/Fe] C/Fe abundance ratio (C2,CH,CI features)
158-161 F4.2 [-] [N/Fe] N/Fe abundance ratio (CN features)
163-167 F5.2 [-] [O/Fe] O/Fe abundance ratio ([OI] features)
--------------------------------------------------------------------------------
Note (1): Abundance ratio from this study
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name
14- 17 F4.2 [-] [NaI/Fe] NaI/Fe abundance ratio Nmax=5
19- 23 F5.2 [-] [MgI/Fe] MgI/Fe abundance ratio Nmax=11
25- 29 F5.2 [-] [AlI/Fe] AlI/Fe abundance ratio Nmax=6
31- 34 F4.2 [-] [SiI/Fe] SiI/Fe abundance ratio Nmax=11
36- 40 F5.2 [-] [PI/Fe] PI/Fe abundance ratio Nmax=2
42- 46 F5.2 [-] [SI/Fe] SI/Fe abundance ratio Nmax=10
48- 52 F5.2 [-] [KI/Fe] KI/Fe abundance ratio Nmax=2
54- 57 F4.2 [-] [CaI/Fe] CaI/Fe abundance ratio Nmax=11
59- 63 F5.2 [-] [ScI/Fe] ScI/Fe abundance ratio Nmax=2
65- 69 F5.2 [-] [TiI/Fe] TiI/Fe abundance ratio Nmax=10
71- 75 F5.2 [-] [TiII/Fe] TiII/Fe abundance ratio Nmax=1
77- 81 F5.2 [-] [CrI/Fe] CrI/Fe abundance ratio Nmax=3
83- 87 F5.2 [-] [CoI/Fe] CoI/Fe abundance ratio Nmax=1
89- 93 F5.2 [-] [NiI/Fe] NiI/Fe abundance ratio Nmax=6
95- 98 F4.2 [-] [CeII/Fe] CeII/Fe abundance ratio Nmax=9
100-103 F4.2 [-] [NdII/Fe] ? NdII/Fe abundance ratio Nmax=1
105-109 F5.2 [-] [YbII/Fe] YbII/Fe abundance ratio Nmax=1
111-114 F4.1 --- 12C/13C 12C/13C isotopic ratio (CO features)
116-120 F5.2 [-] [C/Fe] C/Fe abundance ratio (CO,CI features)
122-125 F4.2 [-] [N/Fe] N/Fe abundance ratio (CN features)
127-131 F5.2 [-] [O/Fe] O/Fe abundance ratio (OH features)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Star name (MMU NNNN)
10- 13 F4.2 [-] loge(CI)o logε optical abundance of CI
15- 18 F4.2 [-] loge(CH)o logε optical abundance of CH
20- 23 F4.2 [-] loge(C2)o logε optical abundance of C2
25- 28 F4.2 [-] loge(CI)ir logε infrared abundance of CI
30- 33 F4.2 [-] loge(CO)ir logε infrared abundance of CO
35- 38 F4.2 [-] logemeano Mean logε optical carbon abundance
40- 43 F4.2 [-] logemeanir Mean logε infrared carbon abundance
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Star name (MMU NNNN)
10- 11 I2 --- 13CN8004 13CN isotopic ratio at 8004Å
13- 14 I2 --- 13CO23440 13CO isotopic ratio at 23440Å
16- 17 I2 --- 13CO23730 13CO isotopic ratio at 23730Å
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 10-Feb-2023