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Low-mass Stellar and Substellar Companions to sdB Stars

S. Geier, Lew Classen, P. Brünner, Kurt Nagel, V. Schaffenroth, Christoph Heuser, U. Heber, H. Drechsel, H. Edelmann, C. Koen, Simon J. O'Toole, Luisa Morales-Rueda

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Abstract

It has been suggested that besides stellar companions, substellar objects in close orbits may be able to trigger mass loss in a common envelope phase and form hot subdwarfs. In an ongoing project we search for close substellar companions combining time resolved high resolution spectroscopy with photometry. We determine the fraction of as yet undetected radial velocity variable systems from a sample of 27 apparently single sdB stars to be ≃ 16%. We discovered low-mass stellar companions to the He-sdB CPD−2

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What this paper is about

It has been suggested that besides stellar companions, substellar objects in close orbits may be able to trigger mass loss in a common envelope phase and form hot subdwarfs. In an ongoing project we search for close substellar companions combining time resolved high resolution spectroscopy with photometry. We determine the fraction of as yet undetected radial velocity variable systems from a sample of 27 apparently single sdB stars to be ≃ 16%. We discovered low-mass stellar companions to the He-sdB CPD−2

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Available abstract

It has been suggested that besides stellar companions, substellar objects in close orbits may be able to trigger mass loss in a common envelope phase and form hot subdwarfs. In an ongoing project we search for close substellar companions combining time resolved high resolution spectroscopy with photometry. We determine the fraction of as yet undetected radial velocity variable systems from a sample of 27 apparently single sdB stars to be ≃ 16%. We discovered low-mass stellar companions to the He-sdB CPD−2

Key concepts: Physics, Brown dwarf, Stars, Photometry (optics), Astrophysics, Astronomy, Low Mass, Stellar classification

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