Abundance Analysis of New $r$-Process-Enhanced Stars from the HESP-GOMPA Survey. (arXiv:2007.01371v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Bandyopadhyay_A/0/1/0/all/0/1">Avrajit Bandyopadhyay</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sivarani_T/0/1/0/all/0/1">Thirupathi Sivarani</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Beers_T/0/1/0/all/0/1">Timothy C. Beers</a>

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 $R sim 30,000$, and 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 sub-populations 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.

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 $R sim 30,000$, and 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 sub-populations 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.

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