Hanging indent for bibliography items

Disclaimer

Please note (for others who may read this) that this is not the recommended way to format a bibliography, but in a pinch, it does what you want.

Manually creating hanging paragraphs

The hanging package provides a hangparas environment that can do what you want. Notice I've removed the trailing from your code. should not be used to create new paragraphs.

documentclass{article}
usepackage{hanging}
begin{document}
begin{hangparas}{.25in}{1}
Draine, B. T., 2003, ARA&A, 41, 241

Dufour, R. J. 1984, in IAU Symp. 108, Structure and Evolution of the Magellanic Clouds, ed. S. van den Bergh & K. S. de Boer (Dordrecht: Reidel), 353

Fitzpatrick, E. L., 1986, AJ, 92 , 1068

Fitzpatrick, E. L., 1999, PASP, 111, 63
end{hangparas}
end{document}