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Title: | Abundance analysis of new r-process-enhanced stars from the HESP–GOMPA survey |
Authors: | Bandyopadhyay, A Sivarani, T Beers, C. T |
Keywords: | R-process (1324) Nucleosynthesis (1131) High resolution spectroscopy (2096) Chemical abundances (224) |
Issue Date: | 10-Aug-2020 |
Publisher: | IOP Publishing |
Citation: | The Astrophysical Journal, Vol. 899, No. 1, 22 |
Abstract: | We present a study on the detailed chemical abundances of five new relatively bright r-process-enhanced stars that were initially observed as part of the SDSS/MARVELS pre-survey. These stars were selected, on the basis of their metallicities and carbon abundances, among a total of 60 stars, for high-resolution spectroscopic follow-up as part of the HESP–GOMPA survey (Hanle Echelle SPectrograph—Galactic survey Of Metal Poor stArs). Here we discuss the three new r-I and two new r-II stars found in this survey. We have carried out a detailed abundance analysis for each of these stars, at a resolving power of R ∼ 30,000, and we compare our results to the existing literature. We could measure three of the first r-process-peak elements (Sr, Y, and Zr) in all five stars, while Ba, Ce, Nd, Sm, Eu, and Dy could be detected among the second r-process-peak elements. Thorium could also be detected in one of the targets, which is found to be an actinide-boost star. We have carried out a comparative study among the subpopulations of the r-process-enhanced stars and other stars of the Milky Way halo population to constrain the origin of this class of objects. These bright r-process-enhanced stars provide an excellent opportunity to study the nucleosynthesis history of this population in great detail, and shed light on their chemical-enrichment histories. |
Description: | Restricted Access |
URI: | http://hdl.handle.net/2248/7516 |
ISSN: | 0004-637X |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Abundance Analysis of New r-process-enhanced Stars from the HESP–GOMPA Survey.pdf Restricted Access | 1.33 MB | Adobe PDF | View/Open Request a copy |
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