A Gravitational Redshift Determination Of The Mean Mass Of White Dwarfs. DA Stars

dc.contributor.utaustinauthorFalcon, Ross E.en_US
dc.contributor.utaustinauthorWinget, D. E.en_US
dc.contributor.utaustinauthorMontgomery, Michael H.en_US
dc.contributor.utaustinauthorWilliams, Kurtis A.en_US
dc.creatorFalcon, Ross E.en_US
dc.creatorWinget, D. E.en_US
dc.creatorMontgomery, Michael H.en_US
dc.creatorWilliams, Kurtis A.en_US
dc.date.accessioned2016-04-28T19:38:07Z
dc.date.available2016-04-28T19:38:07Z
dc.date.issued2010-03en
dc.description.abstractWe measure apparent velocities (v(app)) of the H alpha and H beta Balmer line cores for 449 non-binary thin disk normal DA 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, < v(g)>: we find < v(g)> = < v(app)> = 32.57 +/- 1.17 km s(-1). Using the mass-radius relation from evolutionary models, this translates to a mean mass of 0.647(-0.014)(+0.013)M(circle dot). We interpret this as the mean mass for all DAs. Our results are in agreement with previous gravitational redshift studies but are significantly higher than all previous spectroscopic determinations except the recent findings of Tremblay & Bergeron. Since the gravitational redshift method is independent of surface gravity from atmosphere models, we investigate the mean mass of DAs with spectroscopic T(eff) both above and below 12,000 K; fits to line profiles give a rapid increase in the mean mass with decreasing T(eff). Our results are consistent with no significant change in mean mass: < M >(hot) = 0.640 +/- 0.014 M(circle dot) and < M >(cool) = 0.686(-0.039)(+0.035)M(circle dot).en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipNational Science Foundation AST-0909107en_US
dc.description.sponsorshipNorman Hackerman Advanced Research Program 003658-02552007en_US
dc.description.sponsorshipThe University of Texas Systemen_US
dc.description.sponsorshipSandia National Laboratoriesen_US
dc.description.sponsorshipDelaware Asteroseismic Centeren_US
dc.identifierdoi:10.15781/T2T81N
dc.identifier.Filename2010_03_gravitationalredshift.pdfen_US
dc.identifier.citationFalcon, Ross E., D. E. Winget, M. H. Montgomery, and Kurtis A. Williams. "A gravitational redshift determination of the mean mass of white dwarfs. DA Stars." The Astrophysical Journal, Vol. 712, No. 1 (Mar., 2010): 585.en_US
dc.identifier.doi10.1088/0004-637x/712/1/585en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34975
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectstars: kinematics and dynamicsen_US
dc.subjecttechniques: radial velocitiesen_US
dc.subjecttechniques: spectroscopicen_US
dc.subjectwhite dwarfsen_US
dc.subjectdigital sky surveyen_US
dc.subjectzz ceti starsen_US
dc.subjecthamburg quasar surveyen_US
dc.subjectatmosphericen_US
dc.subjectparametersen_US
dc.subjecthydrogen linesen_US
dc.subjectgalactic capen_US
dc.subjectheliumen_US
dc.subjectkinematicsen_US
dc.subjectevolutionen_US
dc.subjectspyen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleA Gravitational Redshift Determination Of The Mean Mass Of White Dwarfs. DA Starsen_US
dc.typeArticleen_US

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