Low-mass red giants and masses of NPNs |
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| Authors: | Amos Harpaz Giora Shaviv |
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| Institution: | (1) Department of Physics and Asher Space Research Institute, The Technion, Haifa, Israel;(2) School of Education of the Kibbutz Movement  Oranim , University of Haifa, Israel;(3) Institut für Theoretische Astrophysik, University of Heidelberg, Heidelberg, Germany |
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| Abstract: | The evolutionary track of low-mass red giant stars (0.7–0.9M
 ) is computed with the aim to demonstrate the conditions under which low-mass white dwarfs (WDs) can form through the evolution of single stars. Also, the influence of the mixing length to the scale height ratio on the radius of the star is calculated and the coupling between the mixing-length and the mass-loss rate parameters is investigated. Our conclusions are that the uncertainties in mass-loss and mixing-length to scale-height ratio leave enough parameter space to allow the formation of low-mass WD via single star evolution. We also conclude that the gap between proto-WD stars without any nebula and stars with well-defined nebulae is bridged by stars which have a dilute gas cloud around them which cannot be observed as a nebula. |
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