J/ApJS/234/25 Vanadium transitions in the spectrum of Arcturus (Wood+, 2018)
Vanadium transitions in the spectrum of Arcturus.
Wood M.P., Sneden C., Lawler J.E., Den Hartog E.A., Cowan J.J., Nave G.
<Astrophys. J. Suppl. Ser., 234, 25 (2018)>
=2018ApJS..234...25W 2018ApJS..234...25W
ADC_Keywords: Atomic physics; Abundances; Stars, giant; Line Profiles;
Spectra, optical; Infrared
Keywords: atomic data; line: profiles; methods: laboratory: atomic;
stars: abundances; stars: individual (Arcturus)
Abstract:
We derive a new abundance for vanadium in the bright, mildly
metal-poor red giant Arcturus. This star has an excellent
high-resolution spectral atlas and well-understood atmospheric
parameters, and it displays a rich set of neutral vanadium lines that
are available for abundance extraction. We employ a newly recorded set
of laboratory FTS spectra to investigate any potential discrepancies
in previously reported V I log(gf) values near 900nm. These new
spectra support our earlier laboratory transition data and the
calibration method utilized in that study. We then perform a synthetic
spectrum analysis of weak V I features in Arcturus, deriving
logε(V)=3.54±0.01 (σ=0.04) from 55 lines. There are no
significant abundance trends with wavelength, line strength, or lower
excitation energy.
Description:
New spectra of hollow cathode (HC) lamps were recorded using the
National Institute of Standards and Technology (NIST) 2m Fourier
transform spectrometer (FTS). All spectra were recorded using Si
detectors, silver optics, and an aluminum beamsplitter, and have a
usable wavenumber range of approximately 8500-24000cm-1:
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Index Spectrum Serial HC Lamp Buffer Lamp Limit of Coadds
Number Type Gas Current Resolution
(mA) (cm^-1)
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A Ti041715b 001 Water-cooled Ar 500 0.015 25
B V032417 001 Sealed Ar 20 0.08 64
C V062117a 001 Sealed Ne 20 0.025 32
D V062317a 001 Water-cooled Ne 200 0.03 100
E V062317a 002 Water-cooled Ne 700 0.025 115
F V062617b 001 Water-cooled Ar 250 0.02 95
G V062617b 002 Water-cooled Ar 500 0.02 60
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See section 2 for further explanations.
Arcturus has an excellent public high-resolution, high signal-to-noise
electronic spectrum (ftp://ftp.noao.edu/catalogs/arcturusatlas/)
covering the ultraviolet (115-380nm; Hinkle+ 2005uaas.book.....H 2005uaas.book.....H),
optical (373-930nm; Hinkle+ 2000vnia.book.....H 2000vnia.book.....H), and IR (0.9-5um;
Hinkle & Wallace 2005ASPC..336..321H 2005ASPC..336..321H) spectral regions.
See section 3 for further explanations.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
14 15 39.67 +19 10 56.7 Arcturus = * alf Boo
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 36 55 Vanadium abundances from V I lines in Arcturus
table3.dat 50 10731 Hyperfine Structure (HFS) line component patterns
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See also:
B/pastel : The PASTEL catalogue (Soubiran+, 2016-)
III/124 : Spectrophotometry of 60 stars (Kiehling, 1987)
J/ApJS/111/445 : Spectra of normal stars in the K band (Wallace+ 1997)
J/A+AS/129/237 : G and K dwarfs abundances (Feltzing+ 1998)
J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)
J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)
J/AJ/132/1445 : Standard calibration stars infrared spectra (Engelke+, 2006)
J/A+A/504/543 : 12C16O lines in Arcturus IR spectrum (Tsuji, 2009)
J/A+A/548/A55 : C & O isotopic ratios in Arcturus and Aldebaran (Abia+ 2012)
J/MNRAS/428/3660 : ARGOS line list λ8395-8830Å (Freeman+, 2013)
J/ApJS/207/26 : MgH in the A2Π-X2Σ+ system (Hinkle+, 2013)
J/ApJS/215/20 : Vanadium log(gf) & transition probabilities (Lawler+, 2014)
J/ApJS/211/5 : Line data for the Swan system 12C13C (Ram+, 2014)
J/ApJS/211/31 : Atomic data of vanadium (V I) (Wang+, 2014)
J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)
J/ApJS/214/26 : Line lists for CN isotopes transitions (Sneden+, 2014)
J/A+A/561/A36 : The LickX Spectra library (Worthey+, 2014)
J/A+A/566/A98 : The Gaia Benchmark Stars - Library (Blanco-Cuaresma+, 2014)
J/A+A/577/A9 : Sc, V, Mn, and Co in Milky Way stars (Battistini+, 2015)
J/ApJS/221/24 : SDSS-III APOGEE H-band spectral line lists (Shetrone+, 2015)
J/ApJS/224/35 : New lifetimes and log(gf) for vanadium (V I) (Holmes+, 2016)
J/ApJ/817/53 : Fe-group abundance analysis in HD84937 (Sneden+, 2016)
J/ApJS/229/23 : FeI level energies from star spectra. II. (Peterson+, 2017)
J/ApJS/231/18 : Energy levels + spectral lines of V I (Saloman+, 2017)
J/ApJS/231/19 : Energy levels of ionized vanadium (V II) (Saloman+, 2017)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 nm lambda [554.4/908.6] Wavelength
10- 14 F5.3 eV Elower [0.01/2.4] Lower energy level
16- 20 F5.2 [-] loggf [-3.7/-0.1] log(gf) from
Lawler+ 2014, J/ApJS/215/20
22- 25 F4.2 [-] loge [3.4/3.7] logε from
Lawler+ 2014, J/ApJS/215/20
27- 31 F5.2 [-] loggf2 [-3.5/-0.8]? log(gf) from
Holmes+, 2016, J/ApJS/224/35
33- 36 F4.2 [-] loge2 [3.3/3.8]? logε from
Holmes+, 2016, J/ApJS/224/35
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 F9.3 cm-1 WaveNum [10918.1/41621] Center-of-Gravity Wavenumber (1)
11- 18 F8.4 nm lamAir [240.1/915.7] Center-of-Gravity Air Wavelength (1)
20- 21 I2 --- Fupp [0/11] Component upper level F or total angular
momentum (2)
23- 24 I2 --- Flow [0/10] Component lower level F or total angular
momentum (2)
26- 33 F8.5 cm-1 CWaveR [-0.5/0.4] Component offset Wavenumber with
respect to Center-of-gravity Wavenumber (2)
35- 42 F8.4 pm CWave [-20.7/26.2] Component offset Wavelength with
respect to Center-of-gravity Wavelength (2)
44- 50 F7.5 --- Str [0/0.4] Component strength (2)(3)
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Note (1): Center-of-gravity wavenumbers and wavelengths are given, with
component positions relative to those values. Air wavelengths are
computed using the standard index of air
(Peck & Reeder 1972JOSA...62..958P 1972JOSA...62..958P).
Note (2): These component patterns are computed from the best published HFS
coefficients (see text) and energy levels from
Thorne et al. (2011ApJS..192...11T 2011ApJS..192...11T).
Note (3): Component strengths are normalized to 1.0 for each transition.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Mar-2018