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  • 1
    Electronic Resource
    Electronic Resource
    One- and multi-component models of the upper photosphere based on molecular spectra (1974)
    Springer
    Solar physics 35 (1974), S. 259-276 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have obtained center-to-limb photoelectric spectra of the CN(1,1) B-X bandhead region λ3868–3872 Å at Kitt Peak National Observatory. From these spectra and a detailed analysis of the formation of the CN (1, 1) spectrum we derive a best-fit upper photospheric model differing from the HSRA which is consistent with our previous CN(0, 0) λ3883 spectra. We derive a solar carbon abundance of log A c = 8.30 ± 0.10 compared to the HSRA value of log A c = 8.55 ± 0.10. In addition we specify the regions of formation for the CN(0, 0) λ3883.35 and CN(1, 1) λ 3871.38 bandheads at disc center and limb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151947
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  • 2
    Electronic Resource
    Electronic Resource
    One- and multi-component models of the upper photosphere based on molecular spectra (1974)
    Springer
    Solar physics 36 (1974), S. 287-298 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have obtained accurate center-to-limb photoelectric spectra of the CH (0, 0) C-X bandhead region λ3143–3148 Å at Kitt Peak National Observatory. From these spectra and a detailed analysis of the formation of the CH (0, 0) spectrum we demonstrate that the best-fit upper photospheric model derived from our previous analyses of CN (0, 0) and CN (1, 1) spectra adequately explains the CH C-X observations. In addition we derive a solar carbon abundance of ±0.20 compared to the HSRA value of log Ac = 8.55. This confirms our previous CN analyses which demonstrated that if the HSRA nitrogen abundance of log AN = 7.93 ± 0.10 is assumed, then log Ac = 8.20 ± 0.10. We also specify the regions of formation for the CH(0, 0) λ3143.47 Å band-head at disc center and limb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151197
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  • 3
    Electronic Resource
    Electronic Resource
    A facular model based on the wings of the Ca ii lines (1974)
    Springer
    Solar physics 37 (1974), S. 145-150 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We develop a relatively simple procedure for deriving models of upper photospheric regions based on the damping wings of the Ca ii resonance and infrared triplet lines. The procedure is used to derive a facular model but can also be applied to late-type stars. We compare our model to that of Chapman.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157850
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  • 4
    Electronic Resource
    Electronic Resource
    One- and multi-component models of the upper photosphere based on molecular spectra (1975)
    Springer
    Solar physics 41 (1975), S. 17-33 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Non-LTE synthetic spectra derived from a detailed analysis of the formation of the CN (0, 0) λ13883 Å spectrum are compared with center-limb photoelectric spectra taken at Kitt Peak National Observatory. Kitt Peak National Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation. Significant non-LTE effects are found and the Kurucz, Altrock-Cannon, Mount-Linsky II, and HSRA models are compared. We derive a solar carbon abundance of A c =8.30±0.10 for the Mount-Linsky model and A c =8.40±0.10 for the Altrock-Cannon model, compared to the HSRA value of A c =8.55±0.10, assuming a nitrogen abundance of logA N=7.93. In addition we specify the regions of formation for the CN(0, 0) 3883.35 Å bandhead at disc center and limb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152952
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  • 5
    Electronic Resource
    Electronic Resource
    Ultraviolet spectroscopy of the outer layers of stars (1980)
    Springer
    Astrophysics and space science 67 (1980), S. 285-307 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642384
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  • 6
    Electronic Resource
    Electronic Resource
    GHRS observations of the LISM (1996)
    Springer
    Space science reviews 78 (1996), S. 157-164 
    Details
    ISSN: 1572-9672
    Keywords: LISM ; interstellar medium ; deuterium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The GHRS has obtained high-resolution spectra of interstellar gas toward 19 nearby stars. These excellent data show that the Sun is located inside the Local Interstellar Cloud (LIC) with other warm clouds nearby. I will summarize the physical properties of these clouds and the three-dimensional structure of this warm interstellar gas. There is now clear evidence that the Sun and other late-type stars are surrounded by hydrogen walls in the upwind direction. The D/H ratio probably has a constant value in the LIC, (1.6 ± 0.2) × 10−5, consistent with the measured values for all LIC lines of sight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170802
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  • 7
    Electronic Resource
    Electronic Resource
    Deuterium Abundance in the Local ISM and Possible Spatial Variations (1998)
    Springer
    Space science reviews 84 (1998), S. 285-296 
    Details
    ISSN: 1572-9672
    Keywords: LISM ; interstellar medium ; deuterium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excellent HST/GHRS spectra of interstellar hydrogen and deuterium Lyman-α absorption toward nearby stars allow us to identify systematic errors that have plagued earlier work and to measure accurate values of the D/H ratio in local interstellar gas. Analysis of 12 sightlines through the Local Interstellar Cloud leads to a mean value of D/H = (1.50 ± 0.10) × 10-5 with all data points lying within ± 1σ of the mean. Whether or not the D/H ratio has different values elsewhere in the Galaxy and beyond is a very important open question that will be one of the major objectives of the Far Ultraviolet Spectroscopic Explorer (FUSE) mission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005048124341
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  • 8
    Electronic Resource
    Electronic Resource
    Local Interstellar Medium Summary of Working Group VI (1998)
    Springer
    Space science reviews 84 (1998), S. 309-315 
    Details
    ISSN: 1572-9672
    Keywords: LISM ; interstellar medium ; deuterium ; 3He ; helium-3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This report summarizes the issues discussed in Working Group VI concerning the accuracy of measurements of D/H and 3He/H in the local interstellar medium, possible systematic errors, and emerging trends in the results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005052225249
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  • 9
    Electronic Resource
    Electronic Resource
    Physical properties of solar chromospheric plages (1972)
    Springer
    Solar physics 25 (1972), S. 357-379 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Double pass photoelectric observations are presented of five Caii lines (H, K, 8498 Å, 8542 Å, and 8662 Å) in a number of solar plages of different degrees of activity, quiet regions, and a sunspot. The data are compared with previous work. All five lines show increasing emission together in plages and the least opaque of the infrared triplet lines appears to exhibit core emission prior to the more opaque members of the multiplet. The question of source function equality is considered and the differences and similarities among plage profiles and between plage and quiet profiles are shown qualitatively and quantitatively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192335
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  • 10
    Electronic Resource
    Electronic Resource
    A recalibration of the quiet Sun millimeter spectrum based on the Moon as an absolute radiometric standard (1973)
    Springer
    Solar physics 28 (1973), S. 409-418 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The solar millimeter continuum between 1 and 20 mm is recalibrated using observations of the average lunar brightness temperature at the center of lunar disk and new Moon brightness temperatures. The solar data are placed on a common scale according to the average lunar brightness temperature distribution proposed by Linsky. A least-squares parabolic regression curve is proposed for the solar millimeter continuum. A small departure from this regression curve near 8 mm may indicate the existence of an absorption feature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152312
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