An abundance study of the transition beetween the galactic thick and thin disc
(2009) In Lund Observatory Examensarbeten ASTM31 20091Lund Observatory - Undergoing reorganization
- Abstract
- Detailed abundance analysis of 41 F and G type dwarf stars located in the solar neighborhood are presented. The stellar sample was selected to have kinematics intermediate between the Galactic thin and thick discs. The stars have been observed with the NOT telescope at La Palma, Spain in March 2006 and the ESO 2.2 m telescope at La Silla, Chile between October 1, 2004 and March 31, 2005. Abundance results show good agreement with the previous study by Bensby et al. (2003). For some elements, the inbetween stars represent a fairly smooth transition between the thick disc and the thin disc, which would favor a formation of a thick disc in the Galaxy without a merger event. Also a kinematically independent investigation of the galactic disc... (More)
- Detailed abundance analysis of 41 F and G type dwarf stars located in the solar neighborhood are presented. The stellar sample was selected to have kinematics intermediate between the Galactic thin and thick discs. The stars have been observed with the NOT telescope at La Palma, Spain in March 2006 and the ESO 2.2 m telescope at La Silla, Chile between October 1, 2004 and March 31, 2005. Abundance results show good agreement with the previous study by Bensby et al. (2003). For some elements, the inbetween stars represent a fairly smooth transition between the thick disc and the thin disc, which would favor a formation of a thick disc in the Galaxy without a merger event. Also a kinematically independent investigation of the galactic disc structure based on the star sample from Bensby et al. (2009 in prep) have been performed using the statistical method of cluster analysis. The investigation has been focusing on the possibility to resemble the kinematically selected Galactic populations. Overall the study show diculties in this task, but in a few cases the cluster analysis show some interesting results worth a deeper investigation by future investigators. I also note that when ordering the stars according to the shapes of their respective footprints, using a simple ”sum of squares”, we see a weak age dependence indicating that a low sum of squares implies a young star and a high sum of squares implies an old star. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/1940240
- author
- Sandell, Johan LU
- supervisor
- organization
- course
- ASTM31 20091
- year
- 2009
- type
- H2 - Master's Degree (Two Years)
- subject
- publication/series
- Lund Observatory Examensarbeten
- report number
- 2009-EXA36
- language
- English
- id
- 1940240
- date added to LUP
- 2011-05-09 15:05:57
- date last changed
- 2011-05-09 15:05:57
@misc{1940240,
abstract = {{Detailed abundance analysis of 41 F and G type dwarf stars located in the solar neighborhood are presented. The stellar sample was selected to have kinematics intermediate between the Galactic thin and thick discs. The stars have been observed with the NOT telescope at La Palma, Spain in March 2006 and the ESO 2.2 m telescope at La Silla, Chile between October 1, 2004 and March 31, 2005. Abundance results show good agreement with the previous study by Bensby et al. (2003). For some elements, the inbetween stars represent a fairly smooth transition between the thick disc and the thin disc, which would favor a formation of a thick disc in the Galaxy without a merger event. Also a kinematically independent investigation of the galactic disc structure based on the star sample from Bensby et al. (2009 in prep) have been performed using the statistical method of cluster analysis. The investigation has been focusing on the possibility to resemble the kinematically selected Galactic populations. Overall the study show diculties in this task, but in a few cases the cluster analysis show some interesting results worth a deeper investigation by future investigators. I also note that when ordering the stars according to the shapes of their respective footprints, using a simple ”sum of squares”, we see a weak age dependence indicating that a low sum of squares implies a young star and a high sum of squares implies an old star.}},
author = {{Sandell, Johan}},
language = {{eng}},
note = {{Student Paper}},
series = {{Lund Observatory Examensarbeten}},
title = {{An abundance study of the transition beetween the galactic thick and thin disc}},
year = {{2009}},
}