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The first page reads: A CATALOGUE OF 1116 VARIABLE STARS IN GLOBULAR STAR CLUSTERS BY HELEN B. SAWYER A. Introduction. It is now fifty years since the discovery of the first variable star was announced in a globular cluster. The Nova which appeared in the cluster Messier 80 in 1860 can hardly be said to be the beginning of variable star astronomy in clusters, as it is still in a class by itself. In 1902 Bailey gave a summary of the variables in all the clusters which he himself had investigated, and published co-ordinates for the variables. Except for this compilation however, no catalogue of the variable stars in globular clusters has ever been published.

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The first page reads: A CATALOGUE OF 1116 VARIABLE STARS IN GLOBULAR STAR CLUSTERS BY HELEN B. SAWYER A. Introduction. It is now fifty years since the discovery of the first variable star was announced in a globular cluster. The Nova which appeared in the cluster Messier 80 in 1860 can hardly be said to be the beginning of variable star astronomy in clusters, as it is still in a class by itself. In 1902 Bailey gave a summary of the variables in all the clusters which he himself had investigated, and published co-ordinates for the variables. Except for this compilation however, no catalogue of the variable stars in globular clusters has ever been published.
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Robert McNees (mcnees@mastodon.social)'s status on Friday, 02-Aug-2024 03:12:45 JST Robert McNees
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Helen Sawyer’s husband got a job at an observatory in Victoria, BC. Officially, she worked there as his "volunteer assistant."
It was there that she began her work on variable stars in clusters. The detailed catalogs that she started compiling during this period (and first published in 1939) are still in use today.
https://www.astro.utoronto.ca/~cclement/readhistory.html

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