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Article: The asymmetric drift, the local standard of rest, and implications from RAVE data
Title  The asymmetric drift, the local standard of rest, and implications from RAVE data 

Authors  
Keywords  Galaxy: kinematics and dynamics Solar neighborhood 
Issue Date  2013 
Citation  Astronomy and Astrophysics, 2013, v. 557 How to Cite? 
Abstract  Context. The determination of the local standard of rest (LSR), which corresponds to the measurement of the peculiar motion of the Sun based on the derivation of the asymmetric drift of stellar populations, is still a matter of debate. The classical value of the tangential peculiar motion of the Sun with respect to the LSR was challenged in recent years, claiming a significantly larger value. Aims. We present an improved Jeans analysis, which allows a better interpretation of the measured kinematics of stellar populations in the Milky Way disc. We show that the Radial Velocity Experiment (RAVE) sample of dwarf stars is an excellent data set to derive tighter boundary conditions to chemodynamical evolution models of the extended solar neighbourhood. Methods. We propose an improved version of the Strömberg relation with the radial scalelengths as the only unknown. We redetermine the asymmetric drift and the LSR for dwarf stars based on RAVE data. Additionally, we discuss the impact of adopting a different LSR value on the individual scalelengths of the subpopulations. Results. Binning RAVE stars in metallicity reveals a bigger asymmetric drift (corresponding to a smaller radial scalelength) for more metalrich populations. With the standard assumption of velocitydispersion independent radial scalelengths in each metallicity bin, we redetermine the LSR. The new Strömberg equation yields a joint LSR value of V⊙ = 3.06 ± 0.68 km s1, which is even smaller than the classical value based on Hipparcos data. The corresponding radial scalelength increases from 1.6 kpc for the metalrich bin to 2.9 kpc for the metalpoor bin, with a trend of an even larger scalelength for young metalpoor stars. When adopting the recent Schönrich value of V⊙ = 12.24 km s1 for the LSR, the new Strömberg equation yields much larger individual radial scalelengths of the RAVE subpopulations, which seem unphysical in part. Conclusions. The new Strömberg equation allows a cleaner interpretation of the kinematic data of disc stars in terms of radial scalelengths. Lifting the LSR value by a few km s1 compared to the classical value results in strongly increased radial scalelengths with a trend of smaller values for larger velocity dispersions. © ESO, 2013. 
Persistent Identifier  http://hdl.handle.net/10722/208974 
ISSN  2014 Impact Factor: 4.378 2015 SCImago Journal Rankings: 2.446 
DC Field  Value  Language 

dc.contributor.author  Golubov, Oleksiy   
dc.contributor.author  Just, Andreas   
dc.contributor.author  Bienaymé, Olivier   
dc.contributor.author  BlandHawthorn, Joss Bland   
dc.contributor.author  Gibson, Brad K.   
dc.contributor.author  Grebel, Eva K.   
dc.contributor.author  Munari, Ulisse   
dc.contributor.author  Navarro, Julio F.   
dc.contributor.author  Parker, Quentin A.   
dc.contributor.author  Seabroke, George M.   
dc.contributor.author  Reid, Warren A.   
dc.contributor.author  Siviero, Alessandro   
dc.contributor.author  Steinmetz, Matthias   
dc.contributor.author  Williams, Mary E K   
dc.contributor.author  Watson, Fred G.   
dc.contributor.author  Zwitter, Tomaž   
dc.date.accessioned  20150323T02:02:25Z   
dc.date.available  20150323T02:02:25Z   
dc.date.issued  2013   
dc.identifier.citation  Astronomy and Astrophysics, 2013, v. 557   
dc.identifier.issn  00046361   
dc.identifier.uri  http://hdl.handle.net/10722/208974   
dc.description.abstract  Context. The determination of the local standard of rest (LSR), which corresponds to the measurement of the peculiar motion of the Sun based on the derivation of the asymmetric drift of stellar populations, is still a matter of debate. The classical value of the tangential peculiar motion of the Sun with respect to the LSR was challenged in recent years, claiming a significantly larger value. Aims. We present an improved Jeans analysis, which allows a better interpretation of the measured kinematics of stellar populations in the Milky Way disc. We show that the Radial Velocity Experiment (RAVE) sample of dwarf stars is an excellent data set to derive tighter boundary conditions to chemodynamical evolution models of the extended solar neighbourhood. Methods. We propose an improved version of the Strömberg relation with the radial scalelengths as the only unknown. We redetermine the asymmetric drift and the LSR for dwarf stars based on RAVE data. Additionally, we discuss the impact of adopting a different LSR value on the individual scalelengths of the subpopulations. Results. Binning RAVE stars in metallicity reveals a bigger asymmetric drift (corresponding to a smaller radial scalelength) for more metalrich populations. With the standard assumption of velocitydispersion independent radial scalelengths in each metallicity bin, we redetermine the LSR. The new Strömberg equation yields a joint LSR value of V⊙ = 3.06 ± 0.68 km s1, which is even smaller than the classical value based on Hipparcos data. The corresponding radial scalelength increases from 1.6 kpc for the metalrich bin to 2.9 kpc for the metalpoor bin, with a trend of an even larger scalelength for young metalpoor stars. When adopting the recent Schönrich value of V⊙ = 12.24 km s1 for the LSR, the new Strömberg equation yields much larger individual radial scalelengths of the RAVE subpopulations, which seem unphysical in part. Conclusions. The new Strömberg equation allows a cleaner interpretation of the kinematic data of disc stars in terms of radial scalelengths. Lifting the LSR value by a few km s1 compared to the classical value results in strongly increased radial scalelengths with a trend of smaller values for larger velocity dispersions. © ESO, 2013.   
dc.language  eng   
dc.relation.ispartof  Astronomy and Astrophysics   
dc.subject  Galaxy: kinematics and dynamics   
dc.subject  Solar neighborhood   
dc.title  The asymmetric drift, the local standard of rest, and implications from RAVE data   
dc.type  Article   
dc.description.nature  link_to_subscribed_fulltext   
dc.identifier.doi  10.1051/00046361/201321559   
dc.identifier.scopus  eid_2s2.084883753292   
dc.identifier.volume  557   
dc.identifier.eissn  14320746   