Publications
106 results found
Pickering JC, Thorne AP, Murray JE, et al., 2000, Accurate laboratory wavelengths of some ultraviolet lines of Cr, Zn and Ni relevant to time variations of the fine structure constant, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 319, Pages: 163-167, ISSN: 0035-8711
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- Citations: 32
Stark G, Smith PL, Rufus J, et al., 1999, High-resolution photoabsorption cross-section measurements of SO<sub>2</sub> at 295 K between 198 and 220 nm, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, Vol: 104, Pages: 16585-16590, ISSN: 2169-9097
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- Citations: 39
Proffitt CR, Jönsson P, Litzén U, et al., 1999, Goddard high resolution spectrograph observations of the BIII resonance doublet in early B stars:: Abundances and isotope ratios, ASTROPHYSICAL JOURNAL, Vol: 516, Pages: 342-348, ISSN: 0004-637X
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- Citations: 31
Proffitt CR, Jönsson P, Litzén U, et al., 1999, Goddard high-resolution spectrograph observations of the B III resonance doublet in early B stars: Abundances and isotope ratios, Astrophysical Journal, Vol: 516, Pages: 342-348, ISSN: 0004-637X
Boron abundances and isotope ratios in two early B stars have been measured by using the Hubble Space Telescope's Goddard High-Resolution Spectrograph (GHRS) in order to observe the B III resonance doublet near 2066 Å. We also report new experimental and theoretical results for the wavelengths, isotope shift, and hyperfine structure of these boron lines. In HD 886 (γ Pegasi; B2 IV), and HD 35299 (B1 V) the abundance of boron is about a factor of 2 lower than that inferred from solar system meteorites. The 11B/10B isotope ratio in HD 886 is determined to be 4.7+1.1-1.0, and for HD 35299 a value of 3.7+0.8-0.6 is found. These values are consistent with the solar system isotope ratio. In a third star, HD 3360 (ζ Cassiopeiae; B2 IV), our GHRS observations show that the boron abundance is a factor of 40 below the solar system abundance. Our results for HD 886 and HD 35299 appear to be consistent with little dispersion in the initial boron-to-oxygen ratio among Population I stars and a universal 11B/10B isotope ratio. However, the abundance measured for HD 3360 shows that either some stars suffer significant boron depletion while still in the core-hydrogen burning phase of their evolution, or there is indeed a very wide variation in initial Population I boron abundances. A much-improved understanding of boron astration in early B stars will be required before this question can be resolved.
Pickering JC, 1999, Laboratory astrophysics: Improving the atomic data by Fourier transform spectrometry, 6th International Colloquium on Atomic Spect and Oscillator Strengths (ASOS 6), Publisher: ROYAL SWEDISH ACAD SCIENCES, Pages: 27-34, ISSN: 0281-1847
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- Citations: 8
Pickering JC, 1998, Analysis of the lowest 4f-5g supermultiplet of Co II, PHYSICA SCRIPTA, Vol: 58, Pages: 457-463, ISSN: 0031-8949
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- Citations: 8
Pickering JC, Thorne AP, Webb JK, 1998, Precise laboratory wavelengths of the Mg I and Mg II resonance transitions at 2853, 2803 and 2796 Å, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 300, Pages: 131-134, ISSN: 0035-8711
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- Citations: 38
Pickering JC, Raassen AJJ, Uylings PHM, et al., 1998, The spectrum and term analysis of Co II, ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, Vol: 117, Pages: 261-311, ISSN: 0067-0049
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- Citations: 43
Raassen AJJ, Pickering JC, Uylings PHM, 1998, Calculated oscillator strengths of singly ionized cobalt, ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, Vol: 130, Pages: 541-549, ISSN: 0365-0138
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- Citations: 19
Pickering JC, 1998, Analysis of 4d-4f transitions in Co II, PHYSICA SCRIPTA, Vol: 57, Pages: 385-394, ISSN: 0281-1847
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- Citations: 12
Pickering JC, 1996, Measurements of the hyperfine structure of atomic energy levels in CO I, ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, Vol: 107, Pages: 811-822, ISSN: 0067-0049
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- Citations: 55
Pickering JC, Thorne AP, 1996, The spectrum and term analysis of CO I, ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, Vol: 107, Pages: 761-809, ISSN: 0067-0049
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- Citations: 51
Pickering JC, 1996, Hyperfine structure measurements in complex spectra, M.A.S.S.- Model Atmospheres and Spectrum Synthesis, 5Th Vienna - Workshop, Vol: 108, Pages: 154-158
PICKERING JC, SEMENIUK JI, 1995, NEW ATOMIC DATA FOR THE THORIUM-NEODYMIUM STELLAR CHRONOMETER, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 274, Pages: L37-L42, ISSN: 0035-8711
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- Citations: 12
Pickering JC, Thorne AP, Rosberg M, 1995, UV Fourier transform spectroscopy and term analysis of Co I and Co II, Laboratory and Astronomical High Resolution Spectra, Vol: 81, Pages: 204-211
Pickering JC, Thorne AP, Rosberg M, 1995, UV Fourier transform spectroscopy and term analysis of Co I and Co II, Laboratory and Astronomical High Resolution Spectra, Vol: 81, Pages: 204-211
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