110 citations · 654 across the 28 of their papers we have counts for
29 papers
Detection of actinides in CEMP-rs stars
A. M. Riyas, D. Karinkuzhi, S. Van Eck +4
The carbon-enhanced metal-poor stars with hybrid enrichments of slow- and rapid neutron-capture elements, the so-called CEMP-rs stars, still raise many questions due to their elusi…
Abundance of heavy r-process elements in CEMP-rs stars: The role of the i-process
A. M. Riyas, D. Karinkuzhi, S. Van Eck +6
Carbon-enhanced metal-poor (CEMP) stars are ancient stars enriched in carbon and heavy elements. Some of these stars exhibit enhanced s-process and/or r-process elements, hence are…
A chemodynamical study of -process-enhanced stars
Pallavi Saraf, Thirupathi Sivarani, Carlos Allende Prieto +2
The -process enrichment in the Galaxy still remains elusive with regard to its nucleosynthesis conditions and the astrophysical sites where it occurs. As part of ongoing efforts…
Asteroseismology of HD 23734, HD 68703, and HD 73345 using K2-TESS Space-based Photometry and High-resolution Spectroscopy
Santosh Joshi, Athul Dileep, Eugene Semenko +14
In this paper, we present a comprehensive study of three stars, HD 23734, HD 68703, and HD 73345, which were previously observed as chemically peculiar candidates within the Nainit…
On the Origin of Neutron-capture Elements in r-I and r-II Stars: A Differential-abundance Analysis
Pallavi Saraf, Thirupathi Sivarani, Timothy C. Beers +4
We present a strictly line-by-line differential analysis of a moderately -process-enhanced star (-I: HD~107752) with respect to a strongly -process-enhanced star (-II:…
Asteroseismology of the mild Am Sct star HD 118660 : TESS photometry and modelling
Mrinmoy Sarkar, Santosh Joshi, Marc-Antoine Dupret +9
We present the results of an asteroseismic study of HD 118660 (TIC 171729860), being a chemically peculiar (mild Am) star exhibiting Scuti ( Sct) pulsations. It is based on…
Mass-Radius relation for magnetized white dwarfs from SDSS
Drisya Karinkuzhi, Banibrata Mukhopadhyay, Dayal Wickramasinghe +1
We present the observational mass-radius (M-R) relation for a sample of 47 magnetized white dwarfs (WDs) with the magnetic field strength (B) ranging from 1 to 773 MG, identified f…
Does the i-process operate at nearly solar metallicity?
D. Karinkuzhi, S. Van Eck, S. Goriely +7
A sample of 895 s-process-rich candidates has been found among the 454180 giant stars surveyed by LAMOST at low spectral resolution (R~1800). In a previous study, taking advantage…
A neutron star candidate in the long-period binary 56 UMa
A. Escorza, D. Karinkuzhi, A. Jorissen +6
56 UMa is a wide binary system that contains a chemically peculiar red giant and a faint companion. Due to its surface chemical abundances, the red giant was classified as a barium…
Highly magnetized white dwarfs: implications and current status
B. Mukhopadhyay, M. Bhattacharya, A. J. Hackett +3
Over the last decade or so, we have been developing the possible existence of highly magnetized white dwarfs with analytical stellar structure models. While the primary aim was to…
Study of Chemically Peculiar Stars-I : High-resolution Spectroscopy and K2 Photometry of Am Stars in the Region of M44
Santosh Joshi, Otto Trust, E. Semenko +30
We present a study based on the high-resolution spectroscopy and K2 space photometry of five chemically peculiar stars in the region of the open cluster M44. The analysis of the hi…
Sr and Ba abundance determinations: comparing machine-learning with star-by-star analyses -- High-resolution re-analysis of suspected LAMOST barium stars
D. Karinkuzhi, S. Van Eck, A. Jorissen +6
A new large sample of 895 s-process-rich candidates out of 454180 giant stars surveyed by LAMOST at low spectral resolution (R ~ 1800) has been reported by Norfolk et al. (2019; he…
Low-mass low-metallicity AGB stars as an efficient i-process site explaining CEMP-rs stars
D. Karinkuzhi, S. Van Eck, S. Goriely +5
Among Carbon-Enhanced Metal-Poor (CEMP) stars, some are found to be enriched in s-process elements (CEMP-s), in r-process elements (CEMP-r) or in both s- and r-process elements (CE…
Barium & related stars and their white-dwarf companions I. Giant stars
A. Jorissen, H. M. J. Boffin, D. Karinkuzhi +4
This paper provides long-period and revised orbits for barium and S stars adding to previously published ones. The sample of barium stars with strong anomalies comprise all such st…
The Detailed Science Case for the Maunakea Spectroscopic Explorer, 2019 edition
The MSE Science Team, Carine Babusiaux, Maria Bergemann +258
(Abridged) The Maunakea Spectroscopic Explorer (MSE) is an end-to-end science platform for the design, execution and scientific exploitation of spectroscopic surveys. It will unvei…
Barium & related stars and their white-dwarf companions II. Main-sequence and subgiant stars
A. Escorza, D. Karinkuzhi, A. Jorissen +12
Barium (Ba) dwarfs and CH subgiants are the less-evolved analogues of Ba and CH giants. They are F- to G-type main-sequence stars polluted with heavy elements by a binary companion…
S stars and s-process in the Gaia era I. Stellar parameters and chemical abundances in a sub-sample of S stars with new MARCS model atmospheres
Shreeya Shetye, Sophie Van Eck, Alain Jorissen +6
S stars are transition objects between M-type giants and carbon stars on the asymptotic giant branch (AGB). They are characterized by overabundances of s-process elements. Roughly…
Binary interaction along the Red Giant Branch: The Barium Star perspective
Ana Escorza, Lionel Siess, Drisya Karinkuzhi +3
Barium (Ba) stars form via mass-transfer in binary systems, and can subsequently interact with their white dwarf companion in a second stage of binary interaction. We used observat…
When binaries keep track of recent nucleosynthesis: The Zr - Nb pair in extrinsic stars as an s-process diagnostic
D. Karinkuzhi, S. Van Eck, A. Jorissen +9
Barium stars are s-process enriched giants. They owe their chemical peculiarities to a past mass transfer phase. During which they were polluted by their binary companion, which at…
Chemical analysis of three barium stars: HD 51959, HD 88035, HD 121447
Drisya Karinkuzhi, Aruna Goswami, Navin Sridhar +3
We present elemental abundance results from high resolution spectral analysis of three nitrogen-enhanced barium stars. The analysis is based on spectra obtained with the FEROS atta…
Hertzsprung-Russell diagram and mass distribution of barium stars
A. Escorza, H. M. J. Boffin, A. Jorissen +6
With the availability of parallaxes provided by the Tycho-Gaia Astrometric Solution, it is possible to construct the Hertzsprung-Russell diagram (HRD) of barium and related stars w…
Chemical analysis of a carbon-enhanced very metal-poor star: CD-27 14351
Drisya Karinkuzhi, Aruna Goswami, Thomas Masseron
We present the first time abundance analysis of a very metal-poor carbon-enhanced star CD-27 14351 based on a high resolution (R ~ 48000) FEROS spectrum. Our abundance analysis per…
Constraints of the physics of low-mass AGB stars from CH and CEMP stars
S. Cristallo, D. Karinkuzhi, A. Goswami +2
We analyze a set of published elemental abundances from a sample of CH stars which are based on high resolution spectral analysis of ELODIE and SUBARU/HDS spectra. All the elementa…
Abundance analysis of s-process enhanced barium stars
Upakul Mahanta, Drisya Karinkuzhi, Aruna Goswami +1
Detailed chemical composition studies of stars with enhanced abundances of neutron-capture elements can provide observational constraints for neutron-capture nucleosynthesis studie…