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NOAO Newsletter - Cerro Tololo Inter-American Observatory - December 1997 - Number 52

The Yale-CTIO Collaboration: Past and Future

As we prepare to resume operation of the Yale 1-m telescope at CTIO in a new observing mode, it is appropriate to look back at the history of the Yale-CTIO collaboration, and forward to the future. The 1-m was constructed by Boller & Chivens and installed at Bethany, Connecticut in 1965. In 1973, the telescope was shipped to CTIO, and the arrangement under which it operated until this year began. Under this arrangement, CTIO was responsible for instrumenting and maintaining the telescope, and Yale was assigned up to 1/3 of the nights. When instrumentation began to diverge between the 1-m and the 0.9-m, Yale was allowed to take up to half of its nights on the 0.9-m. Recently, Yale has used most of its time on the 0.9-m, but virtually none of the time in principle available on the 1-m.

While Yale faculty and research staff have carried out a variety of projects on the 1-m and 0.9-m during the past quarter century, the majority of the science carried out during Yale's time has been the work of graduate students. Since the late 1970s, Ph.D. theses which have relied heavily on data from the small CTIO telescopes have been produced at Yale at the rate of about one per year. Recently the trend has accelerated: six such theses have been produced since 1995. Many of these projects combine extensive data from the small CTIO telescopes with data from space-based observatories and other wavelength regimes, which suggests that the new observational facilities are creating more interesting projects for small ground-based optical telescopes, rather than rendering them obsolete. The continuing importance of small telescopes as scientific and educational tools can be seen from the scope of these PhD theses, which are listed below.

Starting in April of 1998, the telescope will be operated by a new consortium, consisting of Yale, Ohio State University, the University of Lisbon (Portugal), and CTIO. 10% of the observing time will go to the University of Chile, under the agreement by which AURA operates in Chile. Of the remainder, 30% will be allocated to each university, with 10% reserved for the CTIO users community. The telescope will be equipped with a new instrument comprising both an optical CCD imager and an IR imaging array, which is currently under construction at OSU. The telescope will be operated in queue observing mode, optimized for monitoring projects and targets of opportunity. The observing will be done largely by Chilean service observers, but researchers from the three universities (especially graduate students) will frequently fill in when the CTIO staff members are on vacation, or otherwise unavailable. Information on how the community can apply for time on this telescope will be published in a subsequent newsletter.

At Yale, we are looking forward to working with our new partners. We expect that the combination of new instrumentation and novel observing modes will allow our telescope to continue to make important scientific contributions over the next quarter century, as it has done in the previous one.

Yale PH.D. Theses Employing Significant Amounts of Time on Small CTIO Telescopes

Jim Rose, 1977 "A Dynamical Study of Compact Groups of Galaxies"

Horace Smith, 1980 "An Investigation of Abundance Gradients Within Galactic Globular Clusters"

Bruce Twarog, 1980 "An Observational Study of the Chemical Evolution of the Solar Neighborhood"

Barbara Anthony-Twarog, 1981 "A Photometric Search for White Dwarfs in Intermediate Age Open Clusters"

Bob Boyle, 1981 "Intermediate Band Surface Photometry of Intermediate Galaxies"

John Laird, 1983 "Carbon and Nitrogen Abundances in Field Dwarf Stars"

Nelson Caldwell, 1983 "Star Formation in Early Type Galaxies"

Jim Schombert, 1985 "The Structure of the Brightest Cluster Galaxies"

Taft Armandroff, 1988 "An Observational Study of Disk-Population Globular Clusters"

Bob Light, 1988 "Photometric Analyses of Abundances in Dwarf Spheroidal Galaxies and Globular Clusters"

Jo Ann Eder, 1990 "SO Galaxies: Their Gas Content, Structure and Environment"

Ata Sarajedini, 1992 "Globular Cluster Photometry Near the Turnoff: Blue Stragglers, Relative Ages, and the Horizontal Branch"

Andy Layden, 1993 "The Metallicities and Kinematics of Local RR Lyrae Variables"

Esther Zirbel, 1993 "The Environment of Radio Galaxies"

René Méndez, 1995 "A Semi-Empirical Model for the Distribution of Starcounts Color, and Kinematical Properties of Stars in the Milky Way"

Xinjian Guo, 1995 "Galactic Structure, Kinematics, and Chemical Abundances from UBV Photometry and Absolute Proper Motions to B 22.5 Towards the South Galactic Pole"

Jerry Orosz, 1996 "Optical Observations of Black Hole X-ray Novae"

Eric Rubenstein, 1997 "The Search for Main Sequence Binary Stars in Galactic Globular Clusters"

Becky Koopmann, 1997 "Environmental Effects on Morphology and Massive Star Formation in 93 Bright Virgo Cluster and Isolated Spiral Galaxies"

Sydney Barnes, 1997 "The Rotational Evolution of Young, Solar-Type Stars"

My apologies to anyone who was inadvertently omitted from this list.

Charles Bailyn, Yale University

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