Publication Abstracts
Shulman et al. 1974
Shulman, S., V.J. Bortolot, and P. Thaddeus, 1974: Weak interstellar lines in the visible spectrum of zeta Ophiuchi. Astrophys. J., 193, 97-102, doi:10.1086/153132.
Interstellar absorption lines in the spectrum of ζ Oph have been investigated using a synthesis technique to superpose 31 high-dispersion spectrograms in the wavelength region 365 ∼340 Å. The minimum detectable equivalent width is approximately 0.25 mÅ. Lines which have been observed for the first time in the spectrum of this star are Ca I λ4226, Fe I λλ3720 and 3860, and K I λλ4044 and 4047. Using these data and assuming ionization equilibrium, a new evaluation of the electron density, hydrogen density, and elemental abundances is presented for the -15 km/s cloud. With the direct measurement of both the Ca I and Ca II column densities, the relative abundance computations are shown to be insensitive to the choice of radiation field and kinetic temperature.
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BibTeX Citation
@article{sh04500f,
author={Shulman, S. and Bortolot, V. J. and Thaddeus, P.},
title={Weak interstellar lines in the visible spectrum of zeta Ophiuchi},
year={1974},
journal={Astrophys. J.},
volume={193},
pages={97--102},
doi={10.1086/153132},
}
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RIS Citation
TY - JOUR ID - sh04500f AU - Shulman, S. AU - Bortolot, V. J. AU - Thaddeus, P. PY - 1974 TI - Weak interstellar lines in the visible spectrum of zeta Ophiuchi JA - Astrophys. J. VL - 193 SP - 97 EP - 102 DO - 10.1086/153132 ER -
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