Zobrazeno 1 - 10
of 236
pro vyhledávání: '"Nahar, Sultana N."'
Autor:
Nahar, Sultana N., Shafique, Bilal
Phosphorus (P), a basic element of life, has been a least studied element due to its poor presence in astrophysical spectra. However, search for the P lines has increased considerably with discoveries of exoplanets and are being detected by high reso
Externí odkaz:
http://arxiv.org/abs/2403.01148
Being the backbone element of DNA, phosphorus is a key component in the search for life in the Universe. To aid in its detection, we present line emissivity ratios for the five lowest-lying forbidden [P~II] transitions, namely those among the levels
Externí odkaz:
http://arxiv.org/abs/2301.07736
Akademický článek
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Autor:
Prieto, Carlos Allende, Koesterke, Lars, Hubeny, Ivan, Bautista, Manuel A., Barklem, Paul S., Nahar, Sultana N.
Publikováno v:
A&A 618, A25 (2018)
Models of stellar spectra are necessary for interpreting light from individual stars, planets, integrated stellar populations, nebulae, and the interstellar medium. We provide a comprehensive and homogeneous collection of synthetic spectra for a wide
Externí odkaz:
http://arxiv.org/abs/1807.06049
Phosphorus abundance is crucial for DNA-based extraterrestrial life in exoplanets. Atomic data for observed spectral lines of P-ions are needed for its accurate determination. We present the first calculations for collision strengths for the forbidde
Externí odkaz:
http://arxiv.org/abs/1806.01358
Autor:
Nahar, Sultana N.
The IRON Project, initiated in 1991, aims at two main objectives, i) study the characteristics of and calculate large-scale high accuracy data for atomic radiative and collisional processes, and ii) application in solving astrophysical problems. It f
Externí odkaz:
http://arxiv.org/abs/1801.05410
Extensive resonance structures are manifest in R-Matrix (RM) calculations. However, there exist a large number of highly excited electronic configurations that may contribute to background non-resonant bound-free opacity in high-temperature plasmas.
Externí odkaz:
http://arxiv.org/abs/1801.02188
Autor:
Pradhan, Anil K., Nahar, Sultana N.
A review of a renewed effort to recalculate astrophysical opacities using the R-Matrix method is presented. The computational methods and new extensions are described. Resulting enhancements found in test calculations under stellar interior condition
Externí odkaz:
http://arxiv.org/abs/1801.02085
Autor:
Nahar, Sultana N., Pradhan, Anil K.
Publikováno v:
Phys. Rev. Lett. 116, 235003 (2016)
Aimed at solving the outstanding problem of solar opacity, and radiation transport plasma models in general, we report substantial photoabsorption in the high-energy regime due to atomic core photo-excitations not heretofore considered. In extensive
Externí odkaz:
http://arxiv.org/abs/1606.02731