Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Yerra Bharat Kumar"'
Publikováno v:
The Astrophysical Journal, Vol 957, Iss 1, p 18 (2023)
Carbon-deficient red giants (CDGs) are a peculiar class of stars that have eluded explanation for decades. We aim to better characterize CDGs by using asteroseismology (Kepler, TESS) combined with spectroscopy (APOGEE, LAMOST), and astrometry (Gaia).
Externí odkaz:
https://doaj.org/article/0f5947dd290649ecacd14f4cfc616d7a
In fiber-based spectroscopy within telescopes, a prevailing limitation has been the necessity to align the fiber diameter with the telescope's seeing conditions, often characterized by the Full Width at Half Maximum of the point spread function. This
Externí odkaz:
http://arxiv.org/abs/2406.15592
The 2.34m Vainu Bappu Telescope (VBT) is a reflecting telescope that operates in two modes, prime focus and cassegrain focus, and is equipped with two instruments. In prime focus mode, the telescope has the F-number of f/3.25, and the High-Resolution
Externí odkaz:
http://arxiv.org/abs/2406.15591
Given the implications for the origin of Li enhancement in red giants we have reviewed Li-rich classification of KIC~9821622, the only bonafide RGB giant with He inert-core till date, reported as a Li-rich giant by reanalyzing the high-resolution spe
Externí odkaz:
http://arxiv.org/abs/1911.05243
Autor:
Navarro, Ramón, Jedamzik, Ralf, Singh, Nitish, Sriram, S., Yerra, Bharat Kumar, Deshmukh, Prasanna G.
Publikováno v:
Proceedings of SPIE; August 2024, Vol. 13100 Issue: 1 p131004O-131004O-7, 1179044p
Autor:
Bryant, Julia J., Motohara, Kentaro, Vernet, Joël R. D., Singh, Nitish, Sriram, S., Yerra, Bharat Kumar, Deshmukh, Prasanna G.
Publikováno v:
Proceedings of SPIE; July 2024, Vol. 13096 Issue: 1 p130968I-130968I-7, 1178720p
Results from high resolution spectroscopic analysis of HD 77361 are reported. The LTE analysis shows that HD 77361 is a K giant of atmospheric parameters: Teff = 4580 +/- 75 K, log$g$ = 2.5 +/- 0.1, and \xi_{t} = 1.40 +/-0.5 km/s. We found that the a
Externí odkaz:
http://arxiv.org/abs/0908.2685
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 491:3838-3843
Given the implications for the origin of Li enhancement in red giants we have reviewed Li-rich classification of KIC~9821622, the only bonafide RGB giant with He inert-core till date, reported as a Li-rich giant by reanalyzing the high-resolution spe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cfeb59fecfd0d150fb1949444d84e159
https://doi.org/10.1093/mnras/stz3222
https://doi.org/10.1093/mnras/stz3222
We report novel observational evidence on the evolutionary status of lithium-rich giant stars by combining asteroseismic and lithium abundance data. Comparing observations and models of the asteroseismic gravity-mode period spacing $����_{1}$
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2512ff223b7992f6ac6f6ae1d3912255
http://arxiv.org/abs/2104.12070
http://arxiv.org/abs/2104.12070
Autor:
Bacham E. Reddy, Yerra Bharat Kumar
Publikováno v:
Journal of Astrophysics and Astronomy. 41
The overabundance of lithium in low-mass red giants has been a topic of interest for over four decades. Low-mass stars are expected to destroy lithium gradually throughout their lifetimes. Against this expectation, about $$1\%$$ of red giants in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0796d08ebae1aa97d29bf0f4000bd866
https://doi.org/10.1007/s12036-020-09660-9
https://doi.org/10.1007/s12036-020-09660-9