OXFORD, England, April 19 -- Monthly Notices of the Royal Astronomical Society, a journal that features astronomy and astrophysics, published research articles, including the following topics, in its Vol. 503, No. 4 edition:

Articles:

* A study of Siii and Sii features in spectra of Type Ia supernovae

* Statistics of collision parameters computed from 2D simulations

* Metallicities from high-resolution spectra of 49 RR Lyrae variables

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