Analysis of Two Eclipsing Hot Subdwarf Binaries with a Low Mass Stellar and a Brown Dwarf Companion

  • The formation of hot subdwarf stars (sdBs), which are core helium‐burning stars located on the extended horizontal branch, is still not understood. Many of the known hot subdwarf stars reside in close binary systems with short orbital periods between a few hours and a few days with either M star or white dwarf companions. Common envelope ejection is the most probable formation channel. Among these, eclipsing systems are of special importance because it is possible to constrain the parameters of both components tightly by combining spectroscopic and light curve analyses. We report the discovery of two eclipsing binaries with a brown dwarf (<0.07 M☉) and a 0.15 M☉ late main sequence star compaThe formation of hot subdwarf stars (sdBs), which are core helium‐burning stars located on the extended horizontal branch, is still not understood. Many of the known hot subdwarf stars reside in close binary systems with short orbital periods between a few hours and a few days with either M star or white dwarf companions. Common envelope ejection is the most probable formation channel. Among these, eclipsing systems are of special importance because it is possible to constrain the parameters of both components tightly by combining spectroscopic and light curve analyses. We report the discovery of two eclipsing binaries with a brown dwarf (<0.07 M☉) and a 0.15 M☉ late main sequence star companion in close orbits around sdB stars.show moreshow less

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Metadaten
Author:Veronika Schaffenroth, Stephan Geier, Ulrich Heber, Horst Drechsel, Roy H. Østensen, Pierre F. L. Maxted, Thomas Kupfer, Brad N. Barlow
URN:urn:nbn:de:bvb:29-opus-37543
Document Type:Article
Language:English
Date of Publication (online):2012/11/05
Publishing Institution:Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Release Date:2012/11/05
Tag:brown dwarfs; eclipsing binary stars; stellar mass; white dwarfs
SWD-Keyword:-
Original publication:AIP Conference Proceedings 1331 (2011): S. 174-181. 05.11.2012 <http://proceedings.aip.org/resource/2/apcpcs/1331/1/174_1>
Institutes:Naturwissenschaftliche Fakultät / Naturwissenschaftliche Fakultät -ohne weitere Spezifikation-
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 50 Naturwissenschaften / 500 Naturwissenschaften und Mathematik
PACS-Classification:90.00.00 GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS (for more detailed headings, see the Geophysics Appendix) / 95.00.00 Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations / 95.10.-a Fundamental astronomy / 95.10.Gi Eclipses, transits, and occultations
90.00.00 GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS (for more detailed headings, see the Geophysics Appendix) / 97.00.00 Stars (for relativistic stars, see 04.40.Dg in general relativity and gravitation) / 97.10.-q Stellar characteristics and properties (see also section 26 Nuclear astrophysics) / 97.10.Nf Masses
90.00.00 GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS (for more detailed headings, see the Geophysics Appendix) / 97.00.00 Stars (for relativistic stars, see 04.40.Dg in general relativity and gravitation) / 97.20.-w Normal stars (by class): general or individual / 97.20.Rp Faint blue stars (including blue stragglers), white dwarfs, degenerate stars, nuclei of planetary nebulae (for planetary nebulae, see 98.38.Ly or 98.58.Li)
90.00.00 GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS (for more detailed headings, see the Geophysics Appendix) / 97.00.00 Stars (for relativistic stars, see 04.40.Dg in general relativity and gravitation) / 97.20.-w Normal stars (by class): general or individual / 97.20.Vs Low luminosity stars, subdwarfs, and brown dwarfs
Collections:Universität Erlangen-Nürnberg / Allianzlizenzen / Allianzlizenzen 2011

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