J/ApJ/878/99 Abundances of dwarfs & giants in NGC752 with HIRES (Lum+, 2019)
A comparison of the chemical composition of main-sequence and giant stars in
the open cluster NCC 752.
Lum M.G., Boesgaard A.M.
<Astrophys. J., 878, 99 (2019)>
=2019ApJ...878...99L 2019ApJ...878...99L
ADC_Keywords: Clusters, open; Abundances; Spectra, optical; Stars, dwarfs;
Stars, giant; Equivalent widths
Keywords: astronomical databases: miscellaneous ;
nuclear reactions, nucleosynthesis, abundances ;
open clusters and associations: individual (NGC 752) ;
stars: abundances ; stars: evolution
Abstract:
The chemical composition of stars in open clusters provides the best
information on the chemical evolution of stars via comparison of
main-sequence stars with evolved giants. This is a case study of the
abundances in the dwarfs and giants in the old open cluster NGC 752.
It is also a pilot program for automated abundance determinations,
including equivalent-width measurements, stellar parameter
determinations, and abundance analysis. We have found abundances of 31
element-ion combinations in 23 dwarfs and six giants. The mean cluster
abundance of Fe is solar with [Fe/H]=-0.01±0.06 with no significant
difference between the dwarfs and giants. We find that the cluster
abundances of other elements, including alpha-elements, to be at or
slightly above solar levels. We find some evidence for CNO processing
in the spectra of the giants. The enhancement of Na in giants
indicates that the NeNa cycle has occurred. The abundances of Mg and
Al are similar in the dwarfs and giants, indicating that the hotter
MgAl cycle has not occurred. We find no evidence of s-process
enhancements in the abundances of heavy elements in the giants.
Description:
All NGC752 spectra were obtained from the Keck Observatory Archive
(KOA) and were measured using the HIRES spectrograph, with a
resolution of ∼48000. We utilized observations from both the
"original" (prior to 2004 August) and "upgraded" (post-2004) HIRES.
Table 1 lists the S/N for the composite spectra of each star in our
survey along with the date of observations (spanning 2000-2009 Oct).
For the representative measures, we selected two regions, the first
near 6200Å, the region containing the Teff calibration lines, and
the second near 7800Å, where we measured the OI triplet.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
01 57 41 +37 47.1 NGC 752 = Cl Melotte 12
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 69 50 NGC 752 archive observations
table4.dat 52 2430 Absorption line list
table7.dat 544 32 Measured abundances for NGC 752
table10.dat 24 17239 Equivalent widths as measured
refs.dat 74 68 References
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See also:
I/177 : Proper motions in NGC 752 (Platais 1992)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/A+A/275/101 : Chemical evolution of Galactic disk I. (Edvardsson+ 1993)
J/PASP/106/281 : Photometry and radial velocities in NGC752 (Daniel+, 1994)
J/AJ/113/1073 : Abundances in Cepheid Variables (Fry+ 1997)
J/A+A/326/751 : Chemical composition of halo and disk stars (Nissen+, 1997)
J/A+AS/131/431 : Accurate wavelengths in Sun spectrum (Allende Prieto+ 1998)
J/A+A/339/423 : Velocities of red giants in NGC 752 (Mermilliod+ 1998)
J/A+A/402/343 : IR OI triplet & lines in F-K dwarfs/giants (Takeda, 2003)
J/AN/328/938 : Teff/line-depth ratio for ELODIE spectra (Biazzo+, 2007)
J/ApJ/667/1267 : CrI transition probabilities (Sobeck+, 2007)
J/ApJS/182/51 : Rare earth element transition probabilities (Lawler+, 2009)
J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)
J/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010)
J/A+A/525/A63 : Abundances in Ba stars (Allen+, 2011)
J/A+A/535/A30 : Abundances of 12 stars in open clusters (Carrera+, 2011)
J/ApJS/194/35 : Atomic transition probabilities of Mn (Den Hartog+, 2011)
J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)
J/MNRAS/431/3338 : Abundances of red giants in open clusters (Reddy+, 2013)
J/ApJS/208/27 : Sun and HD 84937 TiII log(gf) and abundances (Wood+, 2013)
J/A+A/566/A98 : The Gaia Benchmark Stars - Library (Blanco-Cuaresma+, 2014)
J/ApJS/215/23 : FeI radiative lifetimes (Den Hartog+, 2014)
J/ApJS/215/20 : Vanadium log(gf) & transition probabilities (Lawler+, 2014)
J/ApJS/214/26 : Line lists for CN isotopes transitions (Sneden+, 2014)
J/ApJS/211/20 : NiI transition probability measurements (Wood+, 2014)
J/MNRAS/446/3562 : Abundances of red giants in NGC752 (Bocek Topcu+, 2015)
J/MNRAS/454/2863 : Teff against colours calibrations (Huang+, 2015)
J/A+A/582/A81 : Gaia FGK benchmark stars: abundances (Jofre+, 2015)
J/ApJS/220/13 : Co I transition probabilities (Lawler+, 2015)
J/AJ/150/134 : uvbyCaHβ photometry of NGC 752 (Twarog+, 2015)
J/A+A/592/A70 : Gaia FGK stars: low-metallicities cand. (Hawkins+, 2016)
J/AJ/153/128 : WOCS. LXXV. Hyades&Praesepe lithium data (Cummings+, 2017)
J/ApJ/862/33 : Improved & expanded membership for NGC752 (Agueros+, 2018)
http://koa.ipac.caltech.edu/ : Keck Observatory Archive (KOA) home page
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- n_ID [dg] Note on ID (d=dwarf; g=giant)
3- 6 I4 --- ID [300/1365] Identification number of the source
from Platais 1991, I/177
(<CL* NGC 752 PLA NNNN> in Simbad)
7- 8 A2 --- f_ID [ *D] Flag on ID (1)
10-12 I3 --- H26 [20/298]? Identification number in
Heinemann 1926AN....227..193H 1926AN....227..193H
( in Simbad)
14-16 I3 --- RV62 [25/487]? Identification number
in Rohlfs & Vanysek 1962AAHam...5..341R 1962AAHam...5..341R
(<Cl* NGC 752 RV NNN> in Simbad)
18-19 I2 h RAh [1] Hour of right ascension (J2000)
21-22 I2 min RAm [55/59] Minute of right ascension (J2000)
24-25 I2 s RAs Second of right ascension (J2000)
27 A1 --- DE- [+] Sign of declination (J2000)
28-29 I2 deg DEd [37/38] Degree of declination (J2000)
31-32 I2 arcmin DEm Arcminute of declination (J2000)
34-35 I2 arcsec DEs Arcsecond of declination (J2000)
37-40 I4 0.1nm lambda1 [3360/6240] Minimum wavelength of the spectrum
41 A1 --- --- [-]
42-45 I4 0.1nm lambda2 Maximum wavelength of the spectrum
47-49 I3 --- SN6200 [35/350]? 6200Å signal to noise ratio
51-53 I3 --- SN7800 [30/450]? 7800Å signal to noise ratio
55-65 A11 "date" Date Date of observation (UT)
66 A1 --- f_Date [d] Flag on Date (1)
68-69 A2 --- Obs Observer (2)
--------------------------------------------------------------------------------
Note (1): Flag as follows:
* = Possible single-line binary
d = Possible misaligned order fit (see text)
D = Spectroscopic binary (unused)
** = Parallax differential (unused)
Note (2): Code as follows:
AB = Boesgaard
JC = Cohen
BJ = Jones
GM = Marcy
SS = Schuler
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- El Element
4- 5 A2 --- Ion Ionization State
7- 14 F8.3 0.1nm lambda [3500.3/8989.5] Central Wavelength, Angstroms
16- 20 F5.2 eV ExPot [0/10.8] Excitation Potential
22- 27 F6.2 [-] loggf [-10.2/0.7] log statistical weight*oscillator
strength
29- 52 A24 --- Ref Reference(s) (see refs.dat file)
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Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [PLA-]
5- 8 I4 --- ID [300/1365]? Star identification
in Platais (1991, I/177)
10- 17 A8 --- Cl Cluster name ("NGC-0752")
19- 24 A6 --- Pop Population ("all", "giants", "dwarf" or
"indiv"=individual star)
26- 30 F5.2 --- FeI [7.39/7.65] Abundance, [FeI/H]
32- 35 F4.2 --- e_FeI [0.03/0.19] FeI line variance
37- 39 I3 --- o_FeI [6/117] Number FeI lines measured
41- 43 F3.1 --- q_FeI [7.7/8.7] Measured line quality (10=excellent)
45- 49 F5.2 --- FeII [7.3/7.62] Abundance, [FeII/H]
51- 54 F4.2 --- e_FeII [0.02/0.22] FeII line variance
56- 57 I2 --- o_FeII [2/29] Number FeII lines measured
59- 62 F4.1 --- q_FeII [7.8/10] Measured line quality (10=excellent)
64- 68 F5.2 --- CI [-0.34/0.19]? Abundance, [CI/Fe]
70- 73 F4.2 --- e_CI [0/0.37]? CI line variance
75- 76 I2 --- o_CI [1/27]?=0 Number CI lines measured
78- 81 F4.1 --- q_CI [0/10]? Measured line quality (10=excellent)
83- 87 F5.2 --- NI [0.12/0.37]? Abundance, [NI/Fe]
89- 92 F4.2 --- e_NI [0/0.28]? NI line variance
94- 94 I1 --- o_NI [1/9]?=0 Number NI lines measured
96- 98 F3.1 --- q_NI [0/1]? Measured line quality (10=excellent)
100-104 F5.2 --- OI [-0.34/0]? Abundance, [OI/Fe]
106-109 F4.2 --- e_OI [0/0.11]? OI line variance
111-112 I2 --- o_OI [1/26]?=0 Number OI lines measured
114-116 F3.1 --- q_OI [8/9.3]? Measured line quality (10=excellent)
118-122 F5.2 --- NaI [-0.32/0.22]? Abundance, [NaI/Fe]
124-127 F4.2 --- e_NaI [0/0.18]? NaI line variance
129-130 I2 --- o_NaI [1/20]?=0 Number NaI lines measured
132-135 F4.1 --- q_NaI [6/10]? Measured line quality (10=excellent)
137-141 F5.2 --- MgI [-0.1/0.17]? Abundance, [MgI/Fe]
143-146 F4.2 --- e_MgI [0/0.25]? MgI line variance
148-149 I2 --- o_MgI [1/29]?=0 Number MgI lines measured
151-154 F4.1 --- q_MgI [6/10]? Measured line quality (10=excellent)
156-160 F5.2 --- AlI [-0.09/0.44]? Abundance, [AlI/Fe]
162-165 F4.2 --- e_AlI [0/0.12]? AlI line variance
167-168 I2 --- o_AlI [1/28]?=0 Number AlI lines measured
170-173 F4.1 --- q_AlI [8/10]? Measured line quality (10=excellent)
175-179 F5.2 --- SiI [-0.04/0.17]? Abundance, [SiI/Fe]
181-184 F4.2 --- e_SiI [0.02/0.18]? SiI line variance
186-187 I2 --- o_SiI [2/30]?=0 Number SiI lines measured
189-191 F3.1 --- q_SiI [6.9/8.7]? Measured line quality (10=excellent)
193-197 F5.2 --- CaI [-0.09/0.11]? Abundance, [CaI/Fe]
199-202 F4.2 --- e_CaI [0.01/0.14]? CaI line variance
204-205 I2 --- o_CaI [2/29]?=0 Number CaI lines measured
207-209 F3.1 --- q_CaI [6/7.4]? Measured line quality (10=excellent)
211-215 F5.2 --- ScII [-0.17/0.1]? Abundance, [ScII/Fe]
217-220 F4.2 --- e_ScII [0/0.23]? ScII line variance
222-223 I2 --- o_ScII [1/27]?=0 Number ScII lines measured
225-228 F4.1 --- q_ScII [7.8/10]? Measured line quality (10=excellent)
230-234 F5.2 --- TiI [0.01/0.27]? Abundance, [TiI/Fe]
236-239 F4.2 --- e_TiI [0.05/0.26]? TiI line variance
241-243 I3 --- o_TiI [5/121]?=0 Number TiI lines measured
245-247 F3.1 --- q_TiI [7.4/9.4]? Measured line quality (10=excellent)
249-253 F5.2 --- TiII [-0.09/0.37]? Abundance, [TiII/Fe]
255-258 F4.2 --- e_TiII [0/0.6]? TiII line variance
260-261 I2 --- o_TiII [1/27]?=0 Number TiII lines measured
263-266 F4.1 --- q_TiII [6/10]? Measured line quality (10=excellent)
268-272 F5.2 --- VI [0.02/0.49]? Abundance, [VI/Fe]
274-277 F4.2 --- e_VI [0.06/0.25]? VI line variance
279-280 I2 --- o_VI [3/20]?=0 Number VI lines measured
282-285 F4.1 --- q_VI [8/10]? Measured line quality (10=excellent)
287-291 F5.2 --- VII [-0.02/0.48]? Abundance, [VII/Fe]
293-296 F4.2 --- e_VII [0/0.12]? VII line variance
298-299 I2 --- o_VII [1/17]?=0 Number VII lines measured
301-304 F4.1 --- q_VII [6/10]? Measured line quality (10=excellent)
306-310 F5.2 --- CrI [-0.1/0.17]? Abundance, [CrI/Fe]
312-315 F4.2 --- e_CrI [0/0.28]? CrI line variance
317-318 I2 --- o_CrI [1/58]?=0 Number CrI lines measured
320-323 F4.1 --- q_CrI [7.7/10]? Measured line quality (10=excellent)
325-329 F5.2 --- CrII [-0.19/0.04]? Abundance, [CrII/Fe]
331-334 F4.2 --- e_CrII [0.03/0.25]? CrII line variance
336-337 I2 --- o_CrII [2/13]?=0 Number CrII lines measured
339-341 F3.1 --- q_CrII [7.7/9]? Measured line quality (10=excellent)
343-347 F5.2 --- MnI [-0.06/0.1]? Abundance, [MnI/Fe]
349-352 F4.2 --- e_MnI [0.03/0.2]? MnI line variance
354-355 I2 --- o_MnI [2/18]?=0 Number MnI lines measured
357-359 F3.1 --- q_MnI [6/8.5]? Measured line quality (10=excellent)
361-365 F5.2 --- CoI [-0.01/0.26]? Abundance, [CoI/Fe]
367-370 F4.2 --- e_CoI [0.01/0.3]? CoI line variance
372-373 I2 --- o_CoI [2/35]? Number CoI lines measured
375-377 F3.1 --- q_CoI [7.3/9.2]?=0 Measured line quality (10=excellent)
379-383 F5.2 --- NiI [-0.11/0.07]? ? Abundance, [NiI/Fe]
385-388 F4.2 --- e_NiI [0.02/0.23]? NiI line variance
390-391 I2 --- o_NiI [4/83]?=0 Number NiI lines measured
393-395 F3.1 --- q_NiI [7.2/8.3]? Measured line quality (10=excellent)
397-401 F5.2 --- CuI [-0.16/0.14]? Abundance, [CuI/Fe]
403-406 F4.2 --- e_CuI [0/0.06]? CuI line variance
408-409 I2 --- o_CuI [1/22]?=0 Number CuI lines measured
411-414 F4.1 --- q_CuI [4/10]? Measured line quality (10=excellent)
416-420 F5.2 --- ZnI [-0.48/0.06]? Abundance, [ZnI/Fe]
422-425 F4.2 --- e_ZnI [0/0.19]? ZnI line variance
427-428 I2 --- o_ZnI [1/20]?=0 Number ZnI lines measured
430-432 F3.1 --- q_ZnI [8/8]? Measured line quality (10=excellent)
434-438 F5.2 --- YII [-0.36/0.2]? Abundance, [YII/Fe]
440-443 F4.2 --- e_YII [0/0.22]? YII line variance
445-446 I2 --- o_YII [1/20]?=0 Number YII lines measured
448-450 F3.1 --- q_YII [4/9.3]? Measured line quality (10=excellent)
452-456 F5.2 --- ZrI [-0.04/0.4]? Abundance, [ZrI/Fe]
458-461 F4.2 --- e_ZrI [0/0.18]? ZrI line variance
463-464 I2 --- o_ZrI [1/12]?=0 Number ZrI lines measured
466-468 F3.1 --- q_ZrI [6/9]? Measured line quality (10=excellent)
470-474 F5.2 --- ZrII [-0.26/0.21]? Abundance, [ZrII/Fe]
476-479 F4.2 --- e_ZrII [0/0.17]? ZrII line variance
481-482 I2 --- o_ZrII [1/10]?=0 Number ZrII lines measured
484-487 F4.1 --- q_ZrII [10]? Measured line quality (10=excellent)
489-493 F5.2 --- CeII [-0.21/0.24]? Abundance, [CeII/Fe]
495-498 F4.2 --- e_CeII [0/0.16]? CeII line variance
500-501 I2 --- o_CeII [1/13]?=0 Number CeII lines measured
503-506 F4.1 --- q_CeII [8.5/10]? Measured line quality (10=excellent)
508-512 F5.2 --- NdII [0.04/0.4]? Abundance, [NdII/Fe]
514-517 F4.2 --- e_NdII [0/0.19]? NdII line variance
519-520 I2 --- o_NdII [1/13]?=0 Number NdII lines measured
522-525 F4.1 --- q_NdII [8/10]? Measured line quality (10=excellent)
527-531 F5.2 --- SmII [-0/0.38]? Abundance, [SmII/Fe]
533-536 F4.2 --- e_SmII [0/0.16]? SmII line variance
538-539 I2 --- o_SmII [1/10]?=0 Number SmII lines measured
541-544 F4.1 --- q_SmII [8/10]? Measured line quality (10=excellent)
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Byte-by-byte Description of file: table10.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ID [300/1365] Star identification
in Platais (1991, I/177)
6- 9 F4.1 --- Ion [6/62.1] Element and Ionization state
11- 18 F8.3 0.1nm lambda [4474.8/8567.7] Central wavelength of line
20- 24 F5.1 0.1pm EW [2.9/249.7] Measured Equivalent Width
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref [1/68] Reference code
4- 32 A29 --- Auth First author's name(s)
34- 52 A19 --- BibCode Bibcode of the reference
54- 74 A21 --- Comm Comment
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Dec-2020