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17th European White Dwarf Workshop: Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS)
Geier, Stephan (2010)
clipboard
mla
clipboard		 Geier S. "17th European White Dwarf Workshop: Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS).", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100818_003_eurowd_0001. Accessed 25 Apr 2024.
apa
clipboard		 Geier, S. (2010). 17th European White Dwarf Workshop: Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS). timms video: Universität Tübingen. Retrieved April 25, 2024 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100818_003_eurowd_0001
harvard
clipboard		 Geier, S. (2010). 17th European White Dwarf Workshop: Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) [Online video]. 18 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100818_003_eurowd_0001 (Accessed: 25 April 2024).
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title: 17th European White Dwarf Workshop: Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS)
alt. title: 17th European White Dwarf Workshop - SN progenitors
creator: Geier, Stephan (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, Massive Unseen Companions, Hot Faint Underluminous Stars, SDSS (MUCHFUSS), Stephan Geier
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) (S. Geier1, P. F. L. Maxted2, U. Heber1, A. Tillich1, H. Hirsch1, R. H. Østensen3, B. N. Barlow4, T. R. Marsh5, B. T. Gänsicke5, R. Napiwotzki6 (1Dr. Karl Remeis-Observatory and ECAP, Astronomical Institute, Friedrich-Alexander University, Erlangen-Nuremberg, Sternwartstr. 7, D 96049 Bamberg, Germany, 2Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK, 3 Institute of Astronomy, K.U.Leuven, Celestijnenlaan 200D, B-3001 Heverlee, Belgium, 4Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599-3255, USA 5Department of Physics, University of Warwick, Conventry CV4 7AL, UK 6Centre of Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK) Most recent results of the ongoing MUCHFUSS project (Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS) are presented. Hot subdwarf stars (sdBs) are core helium-burning stars located at the extreme blue end of the horizontal branch. The formation of these stars is still poorly understood and requires high mass loss in the red giant phase. After the helium-burning phase hot subdwarfs evolve directly towards the WD cooling tracks. About half of the known sdBs reside in close binary systems with unseen companions and are most likely formed via common envelope ejection. Hot subdwarfs with massive white dwarf companions are possible candidates for SN Ia progenitors. Furthermore systems with unseen neutron star or even black hole companions are predicted by binary evolution theory and candidate systems have been found recently. In order to search for sdBs with massive compact companions we selected hot subdwarf stars with high radial velocities and/or RV variabilities from the SDSS spectral database and conducted a survey to identify more RV variable systems. In a multisite follow-up campaign starting in 2009 we obtain time resolved spectroscopy to derive the orbital parameters of the binaries as well as light curves to search for indicative features like eclipses or reflection effects. We present orbital solutions for several sdB binaries with white dwarf companions. As it turned out, our selection criteria not only single out binaries with massive compact companions, but also very short period systems with low mass and possibly substellar companions. In this way we discovered an eclipsing binary most likely consisting of a He-WD progenitor and a brown dwarf.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-18
dc type: image
localtype: video
identifier: UT_20100818_003_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?638496357434978921