Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Raghubar Singh"'
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 1, p L3 (2024)
This Letter presents results from Kepler photometric light curves and a high-resolution spectroscopic study of a super-Li-rich giant KIC11087027. Using the light-curve analysis, we measured the star’s rotational period P _rot = 30.4 ± 0.1 days, wh
Externí odkaz:
https://doaj.org/article/fe33aac9429741e7865022c8ebefb1ee
Publikováno v:
The Astrophysical Journal Letters, Vol 944, Iss 1, p L5 (2023)
In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution ( R ≈ 7500) spectroscopic survey fields. The aster
Externí odkaz:
https://doaj.org/article/bc69997b7b3848eeb4a0ac1df3741327
In this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium resolution (R $\approx$ 7500) spectroscopic survey fields. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab0dd7e6f518d3cb22aab4b18bd04f12
http://arxiv.org/abs/2301.10436
http://arxiv.org/abs/2301.10436
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
In this letter, we report the discovery of 24 new super Li-rich (A(Li) $\ge$ 3.2) giants of He-core burning phase at red clump region. Results are based on systematic search of a large sample of about 12,500 giants common to the LAMOST spectroscopic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::899d422f45a9125d4f39d6cccc61d85d
http://arxiv.org/abs/1906.03198
http://arxiv.org/abs/1906.03198
In this paper, we report the discovery of two new super Li-rich K giants: HD~24960 and TYC~1751-1713-1. Based on high resolution ($R\approx 60,000$) spectroscopy, we have derived Li abundance of A(Li)$\approx$4.0~dex for both stars. Other elemental a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b7b51b2cca04e44986f82015aeef5be
Autor:
B. E. Reddy, Raghubar Singh
Publikováno v:
Proceedings of the International Astronomical Union. 12:348-349
Our recent studies based on a large sample of K giants with Hipparcos parallaxes and spectroscopic analysis resulted more than a dozen new Li-rich K giants including few super Li-rich ones. Most of the Li-rich K giants including the new ones appear t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f5e0c47e36611b8137b1ddc729b0053
https://doi.org/10.1017/s1743921317005804
https://doi.org/10.1017/s1743921317005804
Autor:
Ajay Chaudhari, P. W. Khirade, Raghubar Singh, N.K. Narain, Suresh C. Mehrotra, S. N. Helambe
Publikováno v:
Scopus-Elsevier
Dielectric relaxation study of tetrahydrofuran ( THF ) has been carried out in methanol and ethanol at different temperatures. Time domain Reflectometry (TDR) in reflection mode has been used to measure reflection coefficient in frequency range of 10
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::502ee108969542b3b277962344fe48ac
https://doi.org/10.1016/s0167-7322(99)00102-6
https://doi.org/10.1016/s0167-7322(99)00102-6
Publikováno v:
Astrophysical Journal Letters; 6/10/2019, Vol. 878 Issue 1, p1-1, 1p