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The Star Cluster files, assembled over her 40 years as an astronomer, represent the core of Dr. Hogg's research in a field for which she is an authority and from which many of her published articles were derived. The files are variously comprised of raw data, calculations, correspondence, draft and published articles relating to specific globular clusters. Prints from photographic plates also accompany some files . Most files are titled according to the New General Catalogue number, e.g. NGC 6626, of the star cluster and are arranged numerically following Dr. Hogg's own filing system.

A set of ten boxes of bibliographic index cards accompanies the Star Cluster Files. Cards in boxes seem to relate to specific subjects ie. external galaxies, variables in clusters, interstellar absorption. Boxes /044 - /048 are arranged more or less chronologically by the date of the bibliographic references. All were used for various editions of "A Catalogue of Variable Stars in Globular Clusters". Box B1994-0002/048 appears to relate specifically to references used in "A of Bibliography of Individual Globular Clusters" and its supplement. Index cards in box B1994-0002/049 do not appear to be bibliographic references but rather relate information on specific star clusters and are arranged by NGC number.

Photographs have been left in their original files because of their immediate association with the research materials. It was feared that removal of these photos from individual files would obscure the meaning of both the research in the file and the photographs themselves.

This is an extensive series, which documents Dr. Hogg's publishing activities. Since many of her published articles were addresses delivered at symposiums or reports made to professional committees, addresses and talks have also been included in this series. The files, usually titled by the name of the article, book or publisher contain not only manuscripts and drafts but related correspondence, notes, memos and outlines.

The arrangement of this series is as follows, starting from general articles to the specific endeavour

• Bibliographies and lists of publications
• General articles, addresses, contributions to encyclopedias
• Obituaries
• Academic Papers on Star Clusters
• Bibliography and Catalogue of Star Clusters
• Contributions to "Out of Old Books"
• "The Stars Belong to Everyone"
• Toronto Star Column
• Miscellaneous Writings
• Reprints

Records in this series document both Dr. Hogg's stature as an authority on variable stars and star clusters as well as her role as a teacher of popular astronomy. Draft articles and related notes and correspondence on numerous scientific papers as well as files documenting her contribution to encyclopedias and handbooks reflect both of these roles.

Notably, her work on various editions of "A Catalogue of Variable Stars in Globular Clusters" (1st ed. 1939, 2nd ed. 1955, 3rd. ed. 1973 and 4th incomplete), as well as her time spent on "A Bibliography of Individual Globular Clusters" (1947, 1st supplement 1963) is extensively documented through drafts, research data, original manuscripts. These records relate specifically to the card index found in Series IV, Star Cluster Files and Index Cards.

Records in this series document Dr. Hogg's involvement in numerous associations relating to the study of astronomy. The series, comprised mainly of correspondence, memoranda, reports, membership lists, newsletters, agenda and committee minutes, documents the various positions of authority she held in the leading national and international astronomical and scientific organizations. They cover a twenty-five year span including:

Program Director for Astronomy, United States National Science Foundation (1955-1956); president of the International Astronomical Union Subcommission on Variable Stars in Star Clusters (1955-1961); president of the Royal Astronomical Society of Canada (1957-1959); first woman president of the Physical Sciences section, Royal Society of Canada (1960-1961); president of the Royal Canadian Institute (1964); Councillor of the American Astronomical Society (1965-1968); first president of the Canadian Astronomical Society (1971-1972); honorary president of the Toronto Centre, Royal Astronomical Society of Canada (1972-1977) and honorary president of the Royal Astronomical Society of Canada (1977-1981).

The series also serves to document the wider activities of these organizations in addition to simply shedding light on the activities of Dr. Hogg alone. Notably, council and committee minutes strongly document the workings of the Toronto Centre of the R.A.S.C. between 1961-1986, the R.S.C. between 1955-1985 and the R.C.I. from 1954-1968. The activities of the IAU are also well represented. In particular, a series of reports and memoranda between 1952-1981 highlight the workings of Commission 27 on Variable Stars. Related records outlining the activities of these professional organizations can also be found in the General Professional Correspondence Series (Series I).

Arrangement is alphabetical by association, which include:

• American Astronomical Society (AAS)
• American Association of Variable Star Observers (AAVSO)
• Canadian Astronomical Society (CAS)
• International Astronomical Union (IAU)
• National Research Council (NRC)
• National Science Foundation (NSF)
• Royal Astronomical Society of Canada (RASC)
• Royal Canadian Institute (RCI)
• Royal Society of Canada (RSC)

Includes views of the David Dunlap Observatory Staff (the earliest dates 1939); group photos and informal images documenting meetings and events of astronomical associations such as the Canadian contingent to the IAU meeting in Dublin in 1955, a reception of the RASC in 1958, the IAU 1961 meeting at Berkley, the IAU National Committee for Canada meeting in Toronto, 1964, Sir Charles Wright RCI lecture at the University of Alberta, 1965, meeting of the AAVSO in 1983 and several others; photos used in the RASC journal and other images of observatories and/or astronomical observations which were sent to her as a result of her popularity among the general public; some historical photographs including images of Harlow Shapley at work, portraits of J.S. Plaskett early director of the Dominion Astrophysical Observatory, and his successor Joseph Pearce and, of some significance, three group photos of meetings of Canadian and American astronomers ca. 1908-191-.

Includes views of the David Dunlap Observatory Staff (the earliest dates 1939); group photos and informal images documenting meetings and events of astronomical associations such as the Canadian contingent to the IAU meeting in Dublin in 1955, a reception of the RASC in 1958, the IAU 1961 meeting at Berkley, the IAU National Committee for Canada meeting in Toronto, 1964, Sir Charles Wright RCI lecture at the University of Alberta, 1965, meeting of the AAVSO in 1983 and several others; photos used in the RASC journal and other images of observatories and/or astronomical observations which were sent to her as a result of her popularity among the general public; some historical photographs including images of Harlow Shapley at work, portraits of J.S. Plaskett early director of the Dominion Astrophysical Observatory, and his successor Joseph Pearce and, of some significance, three group photos of meetings of Canadian and American astronomers ca. 1908-191-.

Images of Dr. Hogg receiving Honorary degrees from Mt Holyoke College and University of Lethbridge as well as being invested into the Order of Canada in 1969. Also includes receipt of other awards and honours including the dedication of the Helen Sawyer Hogg Observatory in Ottawa, 1989.

Images of Dr. Hogg receiving Honorary degrees from Mt Holyoke College and University of Lethbridge as well as being invested into the Order of Canada in 1969. Also includes receipt of other awards and honours including the dedication of the Helen Sawyer Hogg Observatory in Ottawa, 1989.

Includes portraits of Dr. Hogg taken at various stages of her life. Many of the publicity photos taken for publications feature Dr. Hogg at work at the Observatory the earliest being 1938 and the latest taken in 1991. There are also a few images documenting her time as a director of Bell Canada and her activities relating to the Noranda Lectures for EXPO.

Includes portraits of Dr. Hogg taken at various stages of her life. Many of the publicity photos taken for publications feature Dr. Hogg at work at the Observatory the earliest being 1938 and the latest taken in 1991. There are also a few images documenting her time as a director of Bell Canada and her activities relating to the Noranda Lectures for EXPO.

Images of Helen as a baby and child growing up in Dunstable; snapshots of her and Frank in the 1930s and 1940s including images with their children in Richmond Hill; photos of her parents and Auntie Lenora with whom she grew up. Views of her grand children and great-grandchildren. Wedding portrait of Frank and Helen Hogg as well as more informal photograph of her and Dr. Priestly when they were married in 1985.

Images of Helen as a baby and child growing up in Dunstable; snapshots of her and Frank in the 1930s and 1940s including images with their children in Richmond Hill; photos of her parents and Auntie Lenora with whom she grew up. Views of her grand children and great-grandchildren. Wedding portrait of Frank and Helen Hogg as well as more informal photograph of her and Dr. Priestly when they were married in 1985.