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Lecture notes by Professor Barbara Ryden.
site exerpt
Lecture 17: White Dwarfs Dwarfs are very upsetting Stephen Sondheim Key Concepts Stars with initial masses M sun will end as white dwarfs. White dwarfs are compact objects supported by degenerate-electron pressure. Newly formed white dwarfs are surrounded by emission nebulae called planetary nebulae...General information on star clusters from SEDS.
http://www.seds.org/messier/cluster.html
A discussion of Lacaille's catalog, which is mainly of historical interest. Includes the catalog itself.
http://bozo.lpl.arizona.edu/messier/xtra/history/lacaille.html