Stellar chemical tagging using phylogenetic trees
| Main Author: | Klemen Čotar |
|---|---|
| Format: | Proceeding poster |
| Bahasa: | eng |
| Terbitan: |
, 2017
|
| Subjects: | |
| Online Access: |
https://zenodo.org/record/3358643 |
Daftar Isi:
- The GALactic Archaeology with HERMES (GALAH) spectroscopic survey aims to provide stellar spectra for 1 million stars in four different wavelength intervals. They are selected in a way that it should be possible to obtain more than 20 different chemical abundances per star. Chemical composition of the stars can be used to find (tag) members of long dissipated stellar clusters (De Silva et al. 2015, MNRAS, 449, 2604). Our method uses abundances of 13 elements (determined by Cannon (Ness et al. 2015, ApJ, 808, 1) method) to asses the similarity in chemical composition of stars. The similarity information is then used to construct a phylogenetic tree that gives us a visual representation of similarity in composition between individual stars. The tree is then traversed in a direction from tips to the root of the tree to further analyze kinematic relations between stars with similar chemical composition.