Elemental abundances of solar sibling candidates

Ramirez, I. and Bajkova, A. T. and Bobylev, V. V. and Roederer, I. U. and Lambert, D. L. and Endl, M. and Cochran, W. D. and MacQueen, P. J. and Wittenmyer, R. A. (2014) Elemental abundances of solar sibling candidates. The Astrophysical Journal, 787 (2). ISSN 0004-637X

[img]
Preview
Text (Published Reportable Version)
Ramírez et al, 2014.pdf

Download (1281Kb) | Preview

Abstract

Dynamical information along with survey data on metallicity and in some cases age have been used recently by some authors to search for candidates of stars that were born in the cluster where the Sun formed. We have acquired high-resolution, high signal-to-noise ratio spectra for 30 of these objects to determine, using detailed elemental abundance analysis, if they could be true solar siblings. Only two of the candidates are found to have solar chemical composition. Updated modeling of the stars' past orbits in a realistic Galactic potential reveals that one of them, HD 162826, satisfies both chemical and dynamical conditions for being a sibling of the Sun. Measurements of rare-element abundances for this star further confirm its solar composition, with the only possible exception of Sm. Analysis of long-term high-precision radial velocity data rules out the presence of hot Jupiters and confirms that this star is not in a binary system. We find that chemical tagging does not necessarily benefit from studying as many elements as possible but instead from identifying and carefully measuring the abundances of those elements that show large star-to-star scatter at a given metallicity. Future searches employing data products from ongoing massive astrometric and spectroscopic surveys can be optimized by acknowledging this fact.


Statistics for USQ ePrint 31767
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version allowed due to publisher copyright policy.
Faculty / Department / School: No Faculty
Date Deposited: 15 May 2017 00:21
Last Modified: 02 Nov 2017 04:39
Uncontrolled Keywords: stars; abundances; fundamental parameters; individual stars; HD 162826; kinematics and dynamics
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970101 Expanding Knowledge in the Mathematical Sciences
Identification Number or DOI: 10.1088/0004-637X/787/2/154
URI: http://eprints.usq.edu.au/id/eprint/31767

Actions (login required)

View Item Archive Repository Staff Only