Abstract
Thejll et al. (1995; hereafter Paper I) discussed the possible origin for excess infrared fluxes detected from the direction of a hot subdwarf star. As several theoretical explanations compete, they presented JHK photometry for 27 hot objects and corresponding analysis. After discarding the possibility that the IR flux originates in an ejected wind from the hot atmosphere, the authors concluded that the most likely explanation is the presence of a cool binary companion. With the aid of comprehensive literature and databases searches several well known cases were corroborated, suspected cases confirmed and new discoveries uncovered.
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References
Kurucz, R.L., 1993, Kurucz CD-ROM No. 13.
Thejll, P.A., Ulla, A., and MacDonald J. 1995, A&A 303, 773–784
Ulla, A., Thejll, P.A., 1996, in preparation
Zombeck, M.V., 1990, “Handbook of Space Astronomy & Astrophysics”, (Cambridge: Cambridge University Press), 2nd ed.
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© 1997 Springer Science+Business Media Dordrecht
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Thejll, P., Ulla, A. (1997). Limits on Gravities of Evolved Stars, from Infrared Photometry and Binary Companions. In: Isern, J., Hernanz, M., García-Berro, E. (eds) White Dwarfs. Astrophysics and Space Science Library, vol 214. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5542-7_11
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DOI: https://doi.org/10.1007/978-94-011-5542-7_11
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