Abstract
Determination of temperature and surface gravity by colors and hydrogen-line profiles have been carried out for hot halo stars. A narrow horizontal branch is found stretching to above 40000 K; the hot O subdwarfs show a nearly vertical sequence, dropping towards the hot white dwarfs.
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Greenstein, J.L. (1971). New Spectroscopic Results on Subluminous Stars, V. In: Luyten, W.J. (eds) White Dwarfs. International Astronomical Union/Union Astronomical International, vol 42. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3081-6_9
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DOI: https://doi.org/10.1007/978-94-010-3081-6_9
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