Analysis of the Helium Strong Star HD 37017

Odell, Andrew P.

doi:10.1007/978-94-009-4744-3_34

Andrew P. Odell^3,4,5

Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 128))

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Abstract

High resolution and signal-to-noise spectra (0.22 A; S/N ≥ 50) of the H-alpha and He I 6678 A lines have been obtained over most of the cycle of the intermediate helium strong star HD 37017 with the Coude spectrograph and CCD camera at KPNO. These spectra are modeled with the non-LTE code of Mihalas to derive properties of the star. Both of the observed lines show small equivalent width variations on the previously known timescale of 0.901 days. The profiles can be simulated by a model with temperature 20,000K, log g=3.4, and helium number fraction 0.25, and which has a helium-rich spot of radius 40° and helium number fraction of 0.60 on the equator. Other possible models are discussed, as well as a model of the weak emission on the wings of H-alpha.

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Authors and Affiliations

Institute for Astronomy, University of Vienna, Tuerkenschanzstrasse 17, A-1180, Vienna, Austria
Andrew P. Odell (Visiting Astronomer)
Northern Arizona University, Flagstaff, AZ, USA
Andrew P. Odell (Visiting Astronomer)
Kitt Peak National Observatory, operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation., USA
Andrew P. Odell (Visiting Astronomer)

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Andrew P. Odell
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Editors and Affiliations

Institute for Theoretical Physics and Observatory, University of Kiel, Germany
Kurt Hunger & Detlef Schönberner &
Indian Institute of Astrophysics, Bangalore, India
N. Kameswara Rao

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Odell, A.P. (1986). Analysis of the Helium Strong Star HD 37017. In: Hunger, K., Schönberner, D., Rao, N.K. (eds) Hydrogen Deficient Stars and Related Objects. Astrophysics and Space Science Library, vol 128. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4744-3_34

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DOI: https://doi.org/10.1007/978-94-009-4744-3_34
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8608-0
Online ISBN: 978-94-009-4744-3
eBook Packages: Springer Book Archive

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