J/ApJ/595/1154 Oxygen abundances in metal-poor stars (Fulbright+, 2003)
Oxygen abundances in metal-poor stars.
Fulbright J.P., Johnson J.A.
<Astrophys. J. 595, 1154 (2003)>
=2003ApJ...595.1154F 2003ApJ...595.1154F
ADC_Keywords: Stars, metal-deficient ; Abundances ; Effective temperatures
Keywords: stars: abundances - stars: atmospheres - stars: fundamental parameters
Abstract:
We present oxygen abundances derived from both the permitted and
forbidden oxygen lines for 54 subgiants and giants with [Fe/H] values
between -2.7 and solar with the goal of understanding the discrepancy
in the derived abundances. A first attempt, using Teff values from
photometric calibrations and surface gravities from luminosities
obtained agreement between the indicators for turn-off stars, but the
disagreement was large for evolved stars. We find that the difference
in the oxygen abundances derived from the permitted and forbidden
lines is most strongly affected by Teff, and we derive a new Teff
scale based on forcing the two sets of lines to give the same oxygen
abundances. These new parameters, however, do not agree with other
observables, such as theoretical isochrones or Balmer-line profile
based Teff determinations. Our analysis finds that one-dimensional,
LTE analyses (with published non-LTE corrections for the permitted
lines) cannot fully resolve the disagreement in the two indicators
without adopting a temperature scale that is incompatible with other
temperature indicators. We also find no evidence of circumstellar
emission in the forbidden lines, removing such emission as a possible
cause for the discrepancy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 97 100 Equivalent Widths of 19 stars + Vesta
table4.dat 59 54 Photometric Values
table5.dat 67 54 Alonso Scale Parameters
table6.dat 67 54 Houdashelt Scale Parameters
table7.dat 77 54 Absolute Magnitude
table9.dat 86 55 Alonso Scale Results (54 stars + Sun)
table10.dat 86 55 Houdashelt Scale Results (54 stars + Sun)
table11.dat 40 55 Ad Hoc Parameter Scale (54 stars + Sun)
table12.dat 86 55 Ad Hoc Scale Results (54 stars + Sun)
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
II/180 : uvby-beta photometry of metal-poor stars (Schuster+ 1989)
J/A+AS/97/951 : uvby-beta photometry of metal-poor stars (Schuster+ 1993)
J/A+AS/117/317 : uvby-beta photometry of metal-poor stars VIII (Schuster+ 1996)
J/A+A/290/885 : Abundances of very metal-poor stars (Primas+, 1994)
J/A+A/300/751 : Metal-poor stars spectroscopy. II (Axer+, 1995)
J/A+A/305/245 : Fe I in metal-poor stars (Magain+, 1996)
J/A+A/314/191 : Metal-poor stars atmospheric parameters I (Gratton+, 1996)
J/A+A/350/955 : Metal-poor stars atmospheric parameters II (Gratton+, 1999)
J/A+A/356/238 : Metal-poor stars atmospheric parameters III (Carretta+ 2000)
J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)
J/A+A/390/235 : Metal-poor stars OI and FeII equivalent widths (Nissen+ 2002)
J/A+A/404/187 : Equivalent widths for metal-poor stars (Gratton+, 2003)
J/AJ/119/2866 : Proper motions of metal-poor stars (Beers+, 2000)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Ion Ion identification
6- 12 F7.2 0.1nm Wave Wavelength in Angstroms
14- 17 F4.1 10-13m VESTA ? Vesta equivalent width in milliAngstroms (1)
19- 22 F4.1 10-13m H434 ? HIP 434 equivalent width in milliAngstroms
24- 27 F4.1 10-13m H484 ? HIP 484 equivalent width in milliAngstroms
29- 32 F4.1 10-13m H2463 ? HIP 2463 equivalent width in milliAngstroms
34- 37 F4.1 10-13m H3985 ? HIP 3985 equivalent width in milliAngstroms
39- 42 F4.1 10-13m H4993 ? HIP 4993 equivalent width in milliAngstroms
44- 47 F4.1 10-13m H5445 ? HIP 5445 equivalent width in milliAngstroms
49- 50 I2 10-13m H5458 ? HIP 5458 equivalent width in milliAngstroms
52- 55 F4.1 10-13m H17649 ? HIP 17649 equivalent width in milliAngstroms
57- 58 I2 10-13m H43228 ? HIP 43228 equivalent width in milliAngstroms
60- 61 I2 10-13m H58514 ? HIP 58514 equivalent width in milliAngstroms
63- 66 F4.1 10-13m H62235 ? HIP 62235 equivalent width in milliAngstroms
68- 71 F4.1 10-13m H65852 ? HIP 65852 equivalent width in milliAngstroms
73- 74 I2 10-13m H74491 ? HIP 74491 equivalent width in milliAngstroms
76- 77 I2 10-13m H88977 ? HIP 88977 equivalent width in milliAngstroms
79- 80 I2 10-13m H91182 ? HIP 91182 equivalent width in milliAngstroms
82- 85 F4.1 10-13m H94931 ? HIP 94931 equivalent width in milliAngstroms
87- 90 F4.1 10-13m H96248 ? HIP 96248 equivalent width in milliAngstroms
92- 93 I2 10-13m H106095 ? HIP 106095 equivalent width in milliAngstroms
95- 96 I2 10-13m H107337 ? HIP 107337 equivalent width in milliAngstroms
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Note (1): Provides a solar spectrum taken as if the Sun was a point source.
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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- 6 I6 --- HIP HIP number
9- 12 F4.2 mag V0 Dereddened V magnitude
14- 17 F4.2 mag E(B-V) ? Reddening
19- 22 F4.2 mag (B-V)0 Dereddened B-V colour index
24- 28 F5.3 mag (b-y)0 Dereddened b-y colour index
30- 33 F4.2 mag (V-Rj)0 ? Dereddened Johnson (V-R) colour index
35- 38 F4.2 mag (V-Rc)0 ? Dereddened Cousins (V-R) colour index
40- 43 F4.2 mag (V-Ij)0 Dereddened Johnson (V-I) colour index
45- 48 F4.2 mag (V-Ic)0 ? Dereddened Cousins (V-I) colour index
50- 53 F4.2 mag (V-K)0 ? Dereddened (V-K) colour index
55- 59 F5.3 mag C0 C0 index
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Byte-by-byte Description of file: table5.dat table6.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number
9- 12 F4.1 Sun [m/H]ini Adopted abundance scaling for the model
atmosphere (input [Fe/H] value)
14- 17 I4 K T(B-V) ? Effective temperature derived from B-V
19- 22 I4 K T(b-y) ? Effective temperature derived from b-y
(in table5.dat only)
24- 27 I4 K T(V-R) ? Effective temperature derived from V-R
29- 32 I4 K T(V-I) ? Effective temperature derived from V-I
34- 37 I4 K T(V-K) ? Effective temperature derived from V-K
39- 42 I4 K Tavg Average effective temperature
44- 47 I4 K Teff Adopted effective temperature
49- 51 I3 K e_Teff ? rms uncertainty on Teff
53- 57 F5.2 mag BC Bolometric correction
59- 62 F4.2 [cm/s2] logg Surface gravity
64- 67 F4.2 km/s Vt Turbulent velocity
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number
9- 14 F6.2 mas plx Trigonometric parallax
16- 21 F6.2 --- (e_plx/plx) Relative error in plx
23- 28 F6.2 mag VMAGplx Absolute V magnitude derived from parallaxes
30- 35 F6.2 mag e_VMAGplx rms uncertainty on VMAG
37- 40 F4.1 mag VMAGH98 ? Absolute V magnitude from Hanson et al.,
1998AJ....116.1286H 1998AJ....116.1286H
42- 46 F5.2 mag VMAGAtt ? Absolute V magnitude from Anthony-Twarog &
Twarog, 1994, Cat. J/AJ/107/1577
48- 51 F4.2 mag VMAGHB ? Absolute V magnitude for
horizontal-branch stars
53- 56 A4 --- n_VMAGHB AGB status (AGB or AGB?)
58- 61 F4.1 mag VMAGiso ? Isochrone-derived absolute V magnitude
63- 67 F5.2 mag VMAG Adopted absolute V magnitude
69- 72 F4.2 mag e_VMAG rms uncertainty on VMAG
74- 77 F4.2 solMass Mass Mass
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Byte-by-byte Description of file: table9.dat table10.dat table12.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number (0=Sun)
9- 12 F4.2 --- E(Of) Of abundance (1)
14- 17 F4.2 --- e_E(Of) ? rms uncertainty on E(Of)
19- 22 F4.2 --- E(Op) Op abundance (1)
24- 27 F4.2 --- e_E(Op) ? rms uncertainty on E(Op)
29- 32 F4.2 --- E(FeI) FeI abundance (1)
34- 37 F4.2 --- e_E(FeI) ? rms uncertainty on E(FeI)
39- 42 F4.2 --- E(FeII) FeII abundance (1)
44- 47 F4.2 --- e_E(FeII) ? rms uncertainty on E(FeII)
49- 53 F5.2 Sun [Fe/H] Metallicity
55- 58 F4.2 Sun [Of/Fe] Of/Fe abundance (2)
60- 63 F4.2 Sun e_[Of/Fe] ? rms uncertainty on [Of/Fe]
65- 68 F4.2 Sun [Op/Fe] Op/Fe abundance (2)
70- 73 F4.2 Sun e_[Op/Fe] ? rms uncertainty on [Op/Fe]
75- 79 F5.2 Sun [Op/Of] Op/Of abundance (2)
81- 84 F4.2 Sun e_[Op/Of] ? rms uncertainty on [Op/Of]
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Note (1): E(X) = logn(X) + 12
Note (2): [X/Y] = logn(X)-logn(Y)
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number (0=Sun)
9- 12 I4 K TAH Ad hoc temperature
14- 16 F3.1 [cm/s2] logg Surface gravity
18- 21 F4.1 Sun [m/H] Adopted abundance scaling for the model
atmosphere (input [Fe/H] value)
23- 26 F4.2 km/s Vt Turbulent velocity
28- 31 I4 K DTeff Total value of ΔTeff
33- 35 I3 K e_DTeff ? rms uncertainty on DTeff
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 21-Nov-2003