J/ApJS/215/20 Vanadium log(gf) and transition probabilities (Lawler+, 2014)
Improved V I log(gf) values and abundance determinations in the photospheres of
the Sun and metal-poor star HD 84937.
Lawler J.E., Wood M.P., Den Hartog E.A., Feigenson T., Sneden C.,
Cowan J.J.
<Astrophys. J. Suppl. Ser., 215, 20 (2014)>
=2014ApJS..215...20L 2014ApJS..215...20L (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Sun ; Line Profiles
Keywords: atomic data; methods: laboratory: atomic; stars: abundances;
stars: individual: HD 84937; Sun: abundances
Abstract:
New emission branching fraction measurements for 836 lines of the
first spectrum of vanadium (VI) are determined from hollow cathode
lamp spectra recorded with the National Solar Observatory 1m Fourier
transform spectrometer (FTS) and a high-resolution echelle
spectrometer. The branching fractions are combined with recently
published radiative lifetimes from laser-induced fluorescence
measurements to determine accurate absolute atomic transition
probabilities for the 836 lines. The FTS data are also used to extract
new hyperfine structure A coefficients for 26 levels of neutral
vanadium. These new laboratory data are applied to determine the V
abundance in the Sun and metal-poor star HD 84937, yielding
logε(V)=3.956±0.004 (σ=0.037) based on 93 VI lines and
logε(V)=1.89±0.03 (σ=0.07) based on nine VI lines,
respectively, using the Holweger-Muller 1D model. These new VI
abundance values for the Sun and HD 84937 agree well with our earlier
determinations based upon VII.
Description:
Data from two complementary spectrometers are used in this work on VI
and in recent work on VII (Wood et al. 2014, J/ApJS/214/18). One of
these is the venerable National Solar Observatory (NSO) 1m Fourier
transform spectrometer (FTS) developed for the McMath Solar telescope
on Kitt Peak, AZ. The second instrument is the 3m focal length echelle
spectrometer at the Univ. of Wisconsin.
Table 1 lists the 14 spectra from the NSO 1m FTS taken from 1979 Dec
12 to 1986 Jul 30. Table 2 lists the spectra from the 3m echelle
spectrometer used in this VI study; taken from 2013 May 15 to 2014
May 14.
Objects:
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RA (ICRS) DE Designation(s)
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09 48 56.10 +13 44 39.3 HD 84937 = TYC 834-654-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 111 14 Fourier Transform Spectra of a custom water-cooled
V Hollow Cathode Discharge (HCD) lamp
table2.dat 64 19 Echelle spectra of commercial V HCD lamps and a
custom water-cooled V HCD lamp
table3.dat 66 836 Experimental Atomic Transition Probabilities for
836 lines of VI organized by increasing
wavelength in air
table4.dat 54 26 Hyperfine Structure (HFS) A coefficients for 25 odd
parity levels and one even parity level of neutral
vanadium from least-square fits to line profiles
in Fourier Transfrom Spectrometer (FTS) data
table5.dat 52 1480 *Hyperfine structure line component patterns for
94 transitions of 51VI
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Note on table5.dat: Hyperfine structure (HFS) computed from the best published
HFS coefficients (see text) and new HFS A coefficients of Table 4, energy
levels of Thorne et al. (2011ApJS..192...11T 2011ApJS..192...11T), and the standard index of air
(Peck and Reeder 1972JOSA...62..958P 1972JOSA...62..958P).
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See also:
J/ApJS/214/26 : Line lists for CN isotopes transitions (Sneden+, 2014)
J/ApJS/214/18 : VII log(gf) values, and V abundance in HD 84937 (Wood+ 2014)
J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)
J/ApJS/211/31 : Atomic data of vanadium (VI) (Wang+, 2014)
J/ApJS/211/20 : NiI transition probability measurements (Wood+, 2014)
J/ApJS/208/27 : Sun and HD 84937 TiII log(gf) and abundances (Wood+, 2013)
J/ApJS/207/13 : The spectrum and term analysis of VII (Thorne+, 2013)
J/ApJ/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)
J/ApJS/194/35 : Atomic transition probabilities of Mn (Den Hartog+, 2011)
J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)
J/A+A/501/519 : Extremely metal-poor stars abundances (Bonifacio+, 2009)
J/ApJS/182/80 : Rare earth abundances (Sneden+, 2009)
J/ApJS/182/51 : Rare earth elements transition probabilities (Lawler+, 2009)
J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)
J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)
J/A+A/404/187 : Equivalent widths for metal-poor stars (Gratton+, 2003)
J/AJ/120/1841 : Abundances & Kinematics of Halo & Disk Stars (Fulbright 2000)
http://diglib.nso.edu/ : National Solar Observatory digital library
http://bass2000.obspm.fr/solar_spect.php : BASS2000: solar spectrum
http://www.nist.gov/pml/data/asd.cfm : NIST atomic spectra database
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/14] Running sequence number
4- 14 A11 "YYYY/MMM/DD" Date Observation date
16- 17 I2 --- Num [1/10] Serial number
19- 23 A5 --- Gas Buffer gas (Ne-Ar)
25- 28 I4 mA iLamp [110/1000] Lamp current
30- 34 I5 cm-1 Wave1 [0/14924] Lower range of wavenumber
35 A1 --- --- [-]
36- 40 I5 cm-1 Wave2 [5769/49105] Upper range of wavenumber
42- 46 F5.3 cm-1 Lim [0.01/0.06] Limit of resolution
48- 49 I2 --- coadd [4/80] Coadds
51- 56 A6 --- Beam Beam splitter (CaF2 pr UV)
58- 71 A14 --- Filt Filter
73-111 A39 --- Det Detector
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- imin [47/137] Minimal experimental index
4 A1 --- --- [-]
5- 7 I3 --- imax [51/141] Maximal experimental index
9- 19 A11 "YYYY/MMM/DD" Date Observation date
21- 33 A13 --- Num Serial numbers (1, 3, 5, 7, 9)
35- 36 A2 --- Gas Buffer gas (Ar or Ne)
38- 39 I2 mA iLamp [3/50] Lamp current
41- 44 I4 0.1nm Wave1 [2000/2200] Lower range of wavenumber (Å)
45 A1 --- --- [-]
46- 49 I4 0.1nm Wave2 [2800/250000] Upper range of wavenumber
(in Angstroms)
51- 56 I6 --- Res [250000] Resolving power
58- 60 I3 --- coadd [6/120] Coadds
62- 64 I3 s Exp [45/900] Exposure time
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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 F9.4 0.1nm lamAir [2384/9157] Wavelength in air; Angstroms (1)
11- 19 F9.3 cm-1 E1 [18085/47702] Upper level (2)
21 A1 --- P1 [oe] Upper level parity, odd or even (2)
22 A1 --- --- [vd]
24- 26 F3.1 --- J1 [0.5/7.5] Upper level J value (2)
28- 36 F9.3 cm-1 E0 [0/24779] Lower level (2)
38 A1 --- P0 [oe] Lower level parity, odd or even (2)
39 A1 --- --- [vd]
41- 43 F3.1 --- J0 [0.5/6.5] Lower level J value (2)
45- 52 F8.4 10+6/s A [0.003/293] Transition probability
54- 60 F7.4 10+6/s e_A Total uncertainty in TranP
62- 66 F5.2 --- log(gf) [-4/0.8] Log of degeneracy times oscillator
strength
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Note (1): Computed from energy levels using the standard index of air
from Peck & Reeder (1972JOSA...62..958P 1972JOSA...62..958P).
Note (2): From Thorne et al (2011ApJS..192...11T 2011ApJS..192...11T).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- Config Electronic configuration
23- 33 A11 --- Term Term
35- 36 I2 --- 2J [1/15] 2 times the J value
37- 38 A2 --- --- [/2]
40- 48 F9.3 cm-1 E [24770/39392] Energy level from Thorne et al.
2011ApJS..192...11T 2011ApJS..192...11T
50- 54 F5.1 mK A [-26.6/21.1] HFS A coefficient (1)
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Note (1): Uncertainties are ±1mK (±0.001/cm) except for levels at 29202.790
and 29296.430 that are each determined using one infrared line. The
HFS A coefficients for these two levels have uncertainties of ±2mK.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 F9.3 cm-1 Wave [11050.7/32709.5] Center-of-Gravity Wavenumber
11- 19 F9.4 0.1nm lamAir [3056/9047] Center-of-Gravity Air Wavelength
in Angstroms
21- 22 I2 --- F1 [0/11] Component upper level F or total
angular momentum
24- 25 I2 --- F0 [0/10] Component lower level F or total
angular momentum
27- 34 F8.5 cm-1 dWave [-0.4/0.4] Component offset Wavenumber with
respect to Center-of-gravity Wavenumber
36- 44 F9.6 0.1nm dLam [-0.2/0.3] Component offset Wavelength with
respect to Center-of-gravity Wavelength
46- 52 F7.5 --- Str [0/0.4] Component strength (1)
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Note (1): Normalized to sum to one.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Feb-2015