J/AJ/166/154 Abundances in M67 open cluster (Brady+, 2023)
M67 Blue Stragglers with High-resolution Infrared Spectroscopy.
Brady K.E., Sneden C., Pilachowski C.A., Afsar M., Mace G.N., Jaffe D.T.,
Gosnell N.M., Seifert R.
<Astron. J., 166, 154 (2023)>
=2023AJ....166..154B 2023AJ....166..154B
ADC_Keywords: Clusters, open; Abundances; Spectra, infrared
Keywords: Blue straggler stars ; Open star clusters ; Stellar abundances
Abstract:
We report on the first detailed infrared chemical analysis of five
binary members (S277, S997, S975, S1031, and S1195) in the open
cluster M67 (NGC2682). These stars are located outside (bluer and/or
brighter than) the main- sequence turnoff region in M67.
High-resolution (R∼45000) near-infrared spectra were obtained with the
Immersion GRating INfrared Spectrograph (IGRINS) at the McDonald
Observatory 2.7m Harlan J. Smith Telescope, providing full spectral
coverage of the H and K bands. The abundances of C, Na, Mg, Al, Si, S,
Ca, Fe, and Ni are measured using neutral atomic absorption lines. We
detect vsini≳25km/s in three of our program stars: S1031, S975, and
S1195. We find our derived abundances to be in good agreement with
turnoff star abundances, similar to published analyses of blue
straggler stars in M67 from optical spectra. Detection of a carbon
enhancement or depletion resulting from mass transfer is difficult due
to the uncertainties in the carbon abundance and the relatively modest
changes that may occur through red giant and asymptotic giant branch
evolution.
Objects:
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RA (2000) DE Designation(s)
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08 51 23.04 +11 48 50.4 M67 = C 0847+120
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 31 95 Line List
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/ApJS/85/315 : F, G and K dwarf stars of the Pleiades (Soderblom+ 1993)
J/AJ/109/1379 : Praesepe & M 67 spectral standards (Allen+ 1995)
J/PASP/110/863 : A Stellar Spectral Flux Library: 1150 - 25000 A (Pickles 1998)
J/A+A/360/499 : Equivalent widths of 9 stars of M 67 (Tautvaisiene+, 2000)
J/A+A/382/899 : BVI photometry in M67 (Stassun+, 2002)
J/A+A/418/509 : Chandra observation of M67 (Van Den Berg+, 2004)
J/A+A/463/789 : Blue stragglers in open clusters (Ahumada+, 2007)
J/A+A/497/497 : Physical parameters from JHK flux (Gonzalez-Hernandez+, 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/AJ/150/97 : Radial velocities in M67. I. 1278 candidates (Geller+, 2015)
J/A+A/594/A43 : APOGEE/Kepler sample stars abundances (Hawkins+, 2016)
J/A+A/585/A150 : On the metallicity of open clusters. III. (Netopil+, 2016)
J/ApJ/865/44 : Abundances of evolved stars from IGRINS. I. (Afsar+, 2018)
J/ApJ/869/9 : Machine-learning investigation of open cluster M67 (Gao, 2018)
J/ApJS/238/29 : IGRINS spectral library (Park+, 2018)
J/A+A/624/A8 : Evolved Galactic open clusters dynamical props (Angelo+, 2019)
J/ApJ/874/97 : Chemical abundances from APOGEE. II. M67 stars (Souto+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Element Atomic Line
7- 16 F10.4 0.1nm lambda [15094/22538] Vacuum wavelength; Angstroms
18- 22 F5.3 eV chi [1.89/9.83] Excitation potential
24- 29 F6.3 --- loggf [-1.52/0.86] log of statistical weight of lower
energy level times oscillator strength of
transition
31- 31 I1 --- r_chi [1/2] Reference for chi (1)
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Note (1): References as follows:
1 = Afsar+, 2018, J/ApJ/865/44
2 = Placco+, 2021RNAAS...5...92P 2021RNAAS...5...92P
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 08-Apr-2024