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={Astrophysical Journal}, 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. JO - Astrophysical Journal VL - 220 SP - 962 EP - 979 DO - 10.1086/155985 ER -
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