Other
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..735p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 178, Mar. 1977, p. 735-743.
Other
8
Electron Pressure, Stellar Atmospheres, Stellar Spectrophotometry, Stellar Temperature, Line Spectra, Metallic Stars, Rare Earth Elements
Scientific paper
It had previously been found that the peculiar star HD 101065 has an effective temperature of about 6000 K and that its spectrum is completely dominated by rare-earth lines. These findings have recently been challenged by other workers, who concluded that the effective temperature is about 7000 K and who adopted a high electron pressure in the reversing layer that is incompatible with the fact that no lines of neutral rare earth could be identified. In the present note, six-color photometry and comparisons with other stars are used to show that the effective temperature of HD 101065 is 6040 plus or minus 100 K. Application of line-blocking and differential-reddening corrections gives a value of 6075 plus or minus 200 K as the most probable effective temperature of this star. A maximum logarithmic electron pressure of 0.9 is computed from the ionization equilibrium between (tentatively identified) neutral and singly ionized dysprosium; a more realistic value of 0.4 is obtained in the same way from erbium lines.
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