Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Reddy, A. B. S."'
We report the discovery of a barium blue straggler star (BSS) in M67, exhibiting enhancements in slow neutron-capture ($s$-) process elements. Spectroscopic analysis of two BSSs (WOCS\,9005 \& WOCS\,1020) and 4 stars located near the main-sequence tu
Externí odkaz:
http://arxiv.org/abs/2407.06897
Autor:
Garcia-Hernandez, D. A., Rao, N. Kameswara, Lambert, D. L., Eriksson, K., Reddy, A. B. S., Masseron, T.
Optical and near-IR photometry suggests that the carbon star DY Persei exhibits fadings similar to those of R Coronae Borealis (RCB) variables. Photometric surveys of the Galaxy and Magellanic Clouds uncovered new DY Per variables with infrared photo
Externí odkaz:
http://arxiv.org/abs/2303.12436
Autor:
Pandey, Gajendra, Hema, B. P., Reddy, Arumalla B. S., Astrophysics, Indian Institute of, Bangalore, Karnataka, India
Surface abundances of 14 (11 majority class and 3 minority class) R Coronae Borealis stars (RCBs) along with the final flash object, V4334 Sgr (Sakurai's object) are revised based on their carbon abundances measured from the observed C2 bands; note t
Externí odkaz:
http://arxiv.org/abs/2108.02736
Autor:
Rao, N. Kameswara, Lambert, David L., Reddy, Arumalla B. S., García-Hernández, D. A., Manchado, Arturo, Díaz-Luis, J. J.
We have detected CH$^{+}$ and CH molecular absorption lines from the young compact planetary nebula IC 4997 from high resolution optical spectra. A high-resolution infra-red (H and K bands) spectrum provides detection of H$_2$ emission lines amongst
Externí odkaz:
http://arxiv.org/abs/2005.00903
Autor:
Reddy, Arumalla B. S.
High spectral resolution and high signal-to-noise ratio optical spectra of red giants in the globular cluster Omega Centauri are analysed for stellar parameters and chemical abundances of 15 elements including helium by either line equivalent widths
Externí odkaz:
http://arxiv.org/abs/2004.09415
Autor:
Rao, N. Kameswara, Lambert, David L., Reddy, Arumalla B. S, Gupta, Ranjan, Muneer, S., Varghese, Baba, Singh, Harinder P.
High-resolution optical spectra were obtained in 2017-2019 with The Southern African Large Telescope of fifteen stars in the direction of the Vela supernova remnant. Interstellar Ca ii H and K and Na i D lines are discussed in this paper. In particul
Externí odkaz:
http://arxiv.org/abs/2001.05790
Akademický článek
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We have analysed high-dispersion echelle spectra ($R = 60000$) of red giant members of five open clusters to derive abundances for many elements from Na to Eu. The [Fe/H] values are $-0.06\pm0.03$ for Stock 2, $-0.11\pm0.03$ for NGC 2168, $-0.01\pm0.
Externí odkaz:
http://arxiv.org/abs/1902.02939
Several abundance analyses of Galactic open clusters (OCs) have shown a tendency for Ba but not for other heavy elements (La$-$Sm) to increase sharply with decreasing age such that Ba was claimed to reach [Ba/Fe] $\simeq +0.6$ in the youngest cluster
Externí odkaz:
http://arxiv.org/abs/1707.07051
Autor:
Rao, N. Kameswara, Lambert, David L., Reddy, Arumalla B. S., Gupta, Ranjan, Muneer, S., Singh, Harinder P.
In a survey conducted between 2011-12 of interstellar Na I D line profiles in the direction of the Vela supernova remnant, a few lines of sight showed dramatic changes in low velocity absorption components with respect to profiles from 1993-1994 repo
Externí odkaz:
http://arxiv.org/abs/1701.04349