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17th European White Dwarf Workshop: A Gravitational Redshift Determination of the Mean Mass of White Dwarfs
Falcon, Ross E. (2010)
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mla
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Falcon R. "17th European White Dwarf Workshop: A Gravitational Redshift Determination of the Mean Mass of White Dwarfs.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100816_007_eurowd_0001. Accessed 30 Oct 2020.
apa
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Falcon, R. (2010). 17th European White Dwarf Workshop: A Gravitational Redshift Determination of the Mean Mass of White Dwarfs. timms video: Universität Tübingen. Retrieved October 30, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100816_007_eurowd_0001
harvard
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Falcon, R. (2010). 17th European White Dwarf Workshop: A Gravitational Redshift Determination of the Mean Mass of White Dwarfs [Online video]. 16 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100816_007_eurowd_0001 (Accessed: 30 October 2020).
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title: 17th European White Dwarf Workshop: A Gravitational Redshift Determination of the Mean Mass of White Dwarfs
alt. title: 17th European White Dwarf Workshop - Luminosity function, mass distribution and populations
creator: Falcon, Ross E. (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, Gravitational Redshift Determination, Mean Mass, Ross E. Falcon
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: A Gravitational Redshift Determination of the Mean Mass of White Dwarfs (Ross E. Falcon, D. E. Winget, M. H. Montgomery, and Kurtis A. Williams) (Department of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712, USA) We measure apparent velocities (vapp) of the H® and H¯ Balmer line cores for white dwarfs (WDs) using optical spectra taken for the European Southern Observatory SN Ia Progenitor survey (SPY). Assuming these WDs are nearby and comoving, we correct our velocities to the local standard of rest so that the remaining stellar motions are random. By averaging over the sample, we are left with the mean gravitational redshift, and using the mass-radius relation from evolutionary models, this translates to a mean mass. We investigate a sample of 449 non-binary thin disk normal DA WDs and find a mean mass that is significantly higher than all previous spectroscopic determinations except the recent findings of Tremblay and Bergeron. Since the gravitational redshift method is independent of surface gravity from atmosphere models, we investigate the mean mass of DAs with spectroscopic Teff both above and below 12,000K. Our results are consistent with no significant change in mean mass. We also investigate a sample of 20 DBA WDs and derive a mean mass higher than that of DAs.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-16
dc type: image
localtype: video
identifier: UT_20100816_007_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637396148414714754