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The nature of super-metal-rich stars. Detailed abundance analysis of 8 super-metal-rich star candidates

Feltzing, Sofia LU and Gonzalez, G (2001) In Astronomy & Astrophysics 367. p.253-265
Abstract
We provide detailed abundance analyses of 8 candidate super-metal-richstars. Five of them are confirmed to have [Fe/H]>0.2 dex, thegenerally-accepted limit for super-metal-richness. Furthermore, wederive abundances of several elements and find that the stars followtrends seen in previous studies of metal-rich stars. Ages are estimatedfrom isochrones and velocities calculated. We find that there do existvery metal-rich stars that are older than 10 Gyr. This is contrary towhat is found in several recent studies of the galactic age-metallicityrelation. This is tentative evidence that there might not exist aone-to-one relation between age and metallicity for all stars. This isnot surprising considering the current models of the... (More)
We provide detailed abundance analyses of 8 candidate super-metal-richstars. Five of them are confirmed to have [Fe/H]>0.2 dex, thegenerally-accepted limit for super-metal-richness. Furthermore, wederive abundances of several elements and find that the stars followtrends seen in previous studies of metal-rich stars. Ages are estimatedfrom isochrones and velocities calculated. We find that there do existvery metal-rich stars that are older than 10 Gyr. This is contrary towhat is found in several recent studies of the galactic age-metallicityrelation. This is tentative evidence that there might not exist aone-to-one relation between age and metallicity for all stars. This isnot surprising considering the current models of the independentevolution of the different galactic components. We also find that onestar, HD 182572, could with ~ 75% chance be a thick disk star with, forthe thick disk, an extremely high metallicity at 0.34 dex. This star is,intriguingly, also somewhat enhanced in the alpha -elements. Based onobservations obtained at the McDonald Observatory.} (Less)
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Contribution to journal
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published
subject
keywords
STARS: ABUNDANCES, FUNDAMENTAL PARAMETERS, LATE-TYPE, INDIVIDUAL HD 10780, HD 32147, HD 99491, HD 104304, HD 121370, HD 145675, HD 196755, HD 182572, GALAXY: SOLAR NEIGHBOURHOOD
in
Astronomy & Astrophysics
volume
367
pages
253 - 265
publisher
EDP Sciences
external identifiers
  • scopus:0035242541
ISSN
0004-6361
DOI
language
English
LU publication?
yes
id
a601d371-67d2-460a-a2b0-9434c9fc863f (old id 130247)
date added to LUP
2007-07-13 09:44:37
date last changed
2018-05-29 11:28:27
@article{a601d371-67d2-460a-a2b0-9434c9fc863f,
  abstract     = {We provide detailed abundance analyses of 8 candidate super-metal-richstars. Five of them are confirmed to have [Fe/H]>0.2 dex, thegenerally-accepted limit for super-metal-richness. Furthermore, wederive abundances of several elements and find that the stars followtrends seen in previous studies of metal-rich stars. Ages are estimatedfrom isochrones and velocities calculated. We find that there do existvery metal-rich stars that are older than 10 Gyr. This is contrary towhat is found in several recent studies of the galactic age-metallicityrelation. This is tentative evidence that there might not exist aone-to-one relation between age and metallicity for all stars. This isnot surprising considering the current models of the independentevolution of the different galactic components. We also find that onestar, HD 182572, could with ~ 75% chance be a thick disk star with, forthe thick disk, an extremely high metallicity at 0.34 dex. This star is,intriguingly, also somewhat enhanced in the alpha -elements. Based onobservations obtained at the McDonald Observatory.}},
  author       = {Feltzing, Sofia and Gonzalez, G},
  issn         = {0004-6361},
  keyword      = {STARS: ABUNDANCES,FUNDAMENTAL PARAMETERS,LATE-TYPE,INDIVIDUAL HD 10780,HD 32147,HD 99491,HD 104304,HD 121370,HD 145675,HD 196755,HD 182572,GALAXY: SOLAR NEIGHBOURHOOD},
  language     = {eng},
  pages        = {253--265},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {The nature of super-metal-rich stars. Detailed abundance analysis of 8 super-metal-rich star candidates},
  url          = {http://dx.doi.org/},
  volume       = {367},
  year         = {2001},
}