J/ApJ/797/69 Abundances of late-type stars (Roederer+, 2014)
Detection of neutral phosphorus in the near-ultraviolet spectra of late-type
stars.
Roederer I.U., Jacobson H.R., Thanathibodee T., Frebel A., Toller E.
<Astrophys. J., 797, 69 (2014)>
=2014ApJ...797...69R 2014ApJ...797...69R (SIMBAD/NED BibCode)
ADC_Keywords: Abundances ; Abundances, [Fe/H] ; Equivalent widths
Keywords: nuclear reactions, nucleosynthesis, abundances - stars: abundances
stars: Population II
Abstract:
We report the detection of several absorption lines of neutral
phosphorus (P, Z=15) in archival near-ultraviolet spectra obtained
with the Space Telescope Imaging Spectrograph on board the Hubble
Space Telescope. We derive phosphorus abundances or interesting upper
limits in 14 late-type stars with metallicities spanning
-3.8<[Fe/H]←0.1. Previously, phosphorus had only been studied in
Galactic stars with -1.0<[Fe/H]<+0.3. Iron lines reveal abundance
offsets between the optical and ultraviolet regions, and we discuss
and apply a correction factor to account for this offset. In stars
with [Fe/H]>-1.0, the [P/Fe] ratio decreases toward the solar value
with increasing metallicity, in agreement with previous observational
studies. In stars with [Fe/H]←1.0, $<[P/Fe]$≥+0.04±0.10, which
overlaps with the [P/Fe] ratios found in several high-redshift damped
Lyman-α systems. This behavior hints at a primary origin in
massive stars.
Description:
We obtained observations covering the NUV spectral range from the
Barbara A. Mikulski Archive for Space Telescopes (MAST). These
observations were taken using the medium- or high-resolution echelle
gratings in the Space Telescope Imaging Spectrograph (STIS; Kimble et
al. 1998ApJ...492L..83K 1998ApJ...492L..83K; Woodgate et al. 1998PASP..110.1183W 1998PASP..110.1183W) on board
the Hubble Space Telescope (HST). Spectra downloaded from the MAST
have been reduced by the calstis pipeline and combined by Ayres (2010,
Cat. J/ApJS/187/149). Spectra obtained previously by our own observing
programs were reduced by the calstis pipeline and processed as
described in Roederer et al. (2012ApJS..203...27R 2012ApJS..203...27R,
2014ApJ...791...32R 2014ApJ...791...32R) and Placco et al. (2014ApJ...790...34P 2014ApJ...790...34P).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 101 438 Line list and equivalent widths
table4.dat 32 14 Stellar parameters and metallicities
table6.dat 92 14 Optical abundances of Fe, Na, Mg, Al, Si, and Ca
table7.dat 34 14 Phosphorus abundances
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See also:
J/A+A/275/101 : Chemical evolution of the gal. disk I. (Edvardsson+ 1993)
J/A+AS/142/467 : Broadening of metallic lines by H collisions
(Barklem+ 2000)
J/AJ/120/1841 : Abundances and Kinematics of Halo and Disk Stars
(Fulbright 2000)
J/MNRAS/340/304 : [X/Fe] of Galactic disc F and G dwarfs (Reddy+, 2003)
J/A+A/425/263 : Spectroscopic atlas of HD175640 (Castelli+, 2004)
J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)
J/A+A/415/993 : FeII, ZNI and SI abundances on halo stars (Nissen+, 2004)
J/A+A/435/373 : Broadening of Fe II lines by H collisions (Barklem+, 2005)
J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)
J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)
J/ApJS/187/149 : StarCAT: STIS UV echelle spectra of stars (Ayres, 2010)
J/ApJ/711/573 : Abundances in a halo stellar stream (Roederer+, 2010)
J/ApJS/194/35 : Atomic transition probabilities of Mn (Den Hartog+, 2011)
J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)
J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)
J/ApJ/773/33 : Chemical analysis of the metal-poor subgiant BD+44 493
(Ito+, 2013)
J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)
J/ApJS/208/27 : Sun and HD 84937 TiII log(gf) and abundances (Wood+, 2013)
J/A+A/562/A71 : Chemical abundances of solar neighbourhood dwarfs
(Bensby+, 2014)
J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)
J/ApJS/211/20 : NiI transition probability measurements (Wood+, 2014)
Byte-by-byte Description of file:table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Species Species identifier
7- 13 F7.2 0.1nm lambda Wavelength (in Angstroms)
15- 18 F4.2 eV ExPot Excitation potential
20- 24 F5.2 [-] log(gf) Log of degeneracy times oscillator strength
26- 29 F4.1 10-13m G64-12 ? Equivalent width in G64-12 (1)
31- 35 F5.1 10-13m HD2454 ? Equivalent width in HD 2454 (1)
37- 41 F5.1 10-13m HD16220 ? Equivalent width in HD 16220 (1)
43- 47 F5.1 10-13m HD43318 ? Equivalent width in HD43318 (1)
49- 53 F5.1 10-13m HD76932 ? Equivalent width in HD 76932 (1)
55- 59 F5.1 10-13m HD94028 ? Equivalent width in HD 94028 (1)
61- 65 F5.1 10-13m HD107113 ? Equivalent width in HD 107113 (1)
67- 71 F5.1 10-13m HD108317 ? Equivalent width in HD 108317 (1)
73- 77 F5.1 10-13m HD128279 ? Equivalent width in HD 128279 (1)
79- 83 F5.1 10-13m HD140283 ? Equivalent width in HD 140283 (1)
85- 89 F5.1 10-13m HD155646 ? Equivalent width in HD 155646 (1)
91- 95 F5.1 10-13m HD160617 ? Equivalent width in HD 160617 (1)
97-101 F5.1 10-13m HD211998 ? Equivalent width in HD 211998 (1)
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Note (1): In units of milli-Angstroms.
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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- 09 A9 --- Star Star name
11 A1 --- f_Star [a] Flag on Star (1)
13- 16 I4 K Teff [5170/6547] Effective temperature
18- 21 F4.2 [cm/s2] logg [2.35/4.35] Log surface gravity
23- 26 F4.2 km/s vt [1.15/2] Microturbulent velocity
28- 32 F5.2 [Sun] [Fe/H] [-3.83/-0.17] [Fe/H] abundance ratio
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Note (1): An "a" indicates parameters adopted from Ito et al. (2013,
J/ApJ/773/33)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name
11 A1 --- f_Star [a] Flag on Star
13- 17 F5.2 [Sun] [Fe/H] [-3.83/-0.16] Fe abundance
19- 22 F4.2 [Sun] e_[Fe/H] [0.07/0.19] Uncertainty on [Fe/H]
24- 26 I3 --- o_[Fe/H] [57/253]? Number of Fe lines analysed
28- 32 F5.2 [Sun] [Na/H] [-0.11/0.62] Na abundance
34- 37 F4.2 [Sun] e_[Na/H] [0.1/0.17] Uncertainty on [Na/H]
39 I1 --- o_[Na/H] [2/4]? Number of Na lines analysed
41- 45 F5.2 [Sun] [Mg/H] [-0.01/0.46] Mg abundance
47- 50 F4.2 [Sun] e_[Mg/H] [0.08/0.16] Uncertainty on [Mg/H]
52 I1 --- o_[Mg/H] [1/7]? Number of Mg lines analysed
54- 58 F5.2 [Sun] [Al/H] [-1.1/0.15]?35.7% Al abundance
60- 63 F4.2 [Sun] e_[Al/H] [0.14/0.22]?35.7% Uncertainty on [Al/H]
65 I1 --- o_[Al/H] [0/2]? Number of Al lines analysed
67- 71 F5.2 [Sun] [Si/H] [-0.12/0.59] Si abundance
73- 76 F4.2 [Sun] e_[Si/H] [0.14/0.24] Uncertainty on [Si/H]
78 I1 --- o_[Si/H] [1/4]? Number of Si lines analysed
80- 84 F5.2 [Sun] [Ca/H] [0.07/0.48] Ca abundance
86- 89 F4.2 [Sun] e_[Ca/H] [0.1/0.17] Uncertainty on [Ca/H]
91- 92 I2 --- o_[Ca/H] [8/26]? Number of Ca lines analysed
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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- 9 A9 --- Star Star name
11 A1 --- l_loge(P) [<] Limit flag on loge(P)
13- 16 F4.2 [-] loge(P) [1.83/5.11] Phosphorus abundance logε(P)
18- 21 F4.2 [-] e_loge(P) [0.25/0.36]? Uncertainty on loge(P)
23 A1 --- l_[P/Fe] [<] Limit flag on [P/Fe]
25- 29 F5.2 [Sun] [P/Fe] [-0.21/0.61] [P/Fe] abundance ratio
31- 34 F4.2 [Sun] e_[P/Fe] [0.17/0.26]? Error in [P/Fe]
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History:
From electronic version of the journal
(End) Prepared by [AAS], Marianne Brouty [CDS] 02-Jan-2017