Publication Abstracts

Kelch et al. 1978

Kelch, W.L., J.L. Linsky, G.S. Basri, H.-Y. Chiu, S.-H. Chang, S.P. Maran, and I. Furrenlid, 1978: Stellar model chromospheres. VII. Capella (G5 III+), Pollux (K0 III), and Aldebaran (K5 III). Astrophys. J., 220, 962-979, doi:10.1086/155985.

Data from high-resolution SEC vidicon spectroscopy with a ground-based telescope (for the Ca II K line) and from spectral scans made with the BUSS ultraviolet balloon spectrograph (for the Mg II h and k lines) are used to derive models of the chromospheres and upper photospheres of three G-K giants. The models are based on partial redistribution analyses of the Ca II Kline wings and cores and on the fluxes in the Mg II lines. The photospheres thus computed are hotter than predicted by radiative equilibrium models. Tmin/Teff is found to decrease with decreasing Teff, while rna (the mass column density at the top of the chromosphere) increases with decreasing stellar surface gravity. The computed pressure at the chromosphere top in the primary member of the Capella spectroscopic binary system is 70 times smaller than the transition-region pressure derived by Haisch and Linsky, which suggests that additional terms must be included in the transition-region energy equations for giant stars. Estimates of the Ca II and hydrogen column densities are made for the circumstellar envelope of Aldebaran.

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BibTeX Citation

@article{ke02100q,
  author={Kelch, W. L. and Linsky, J. L. and Basri, G. S. and Chiu, H.-Y. and Chang, S.-H. and Maran, S. P. and Furrenlid, I.},
  title={Stellar model chromospheres. VII. Capella (G5 III+), Pollux (K0 III), and Aldebaran (K5 III)},
  year={1978},
  journal={Astrophys. J.},
  volume={220},
  pages={962--979},
  doi={10.1086/155985},
}

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RIS Citation

TY  - JOUR
ID  - ke02100q
AU  - Kelch, W. L.
AU  - Linsky, J. L.
AU  - Basri, G. S.
AU  - Chiu, H.-Y.
AU  - Chang, S.-H.
AU  - Maran, S. P.
AU  - Furrenlid, I.
PY  - 1978
TI  - Stellar model chromospheres. VII. Capella (G5 III+), Pollux (K0 III), and Aldebaran (K5 III)
JA  - Astrophys. J.
VL  - 220
SP  - 962
EP  - 979
DO  - 10.1086/155985
ER  -

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