https://tex.stackexchange.com/q/477975/35864

natbibentry.tex

\documentclass{article}

\usepackage{bibentry}
\nobibliography*

\usepackage{natbib} 

\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@article{Soderblom2010TheStars,
    title = "The Ages of Stars",
    year = "2010",
    journal = aar,
    author = "Soderblom, David R.",
    month = "3",
    volume = "48",
    pages = "581--629",
    doi = "10.1146/annurev-astro-081309-130806",
}
\end{filecontents}

\begin{document}
\bibentry{Soderblom2010TheStars}

\bibliographystyle{astron}
\bibliography{\jobname}
\end{document}