20 Million Observations: the AAVSO International Database and Its First Century (Poster abstract)

Volume 40 number 1 (2012)

Elizabeth O. Waagen

AAVSO Headquarters, 49 Bay State Road, Cambridge, MA 02138; eowaagen@aavso.org

Abstract

(Abstract only) The American Association of Variable Star Observers (AAVSO) turns 100 in 2011—a century of service to the astronomical community! Another milestone was reached in 2011: the AAVSO International Database (AID) received its 20 millionth variable star observation! The AID contains observations of over 14,750 objects contributed by over 7,500 amateur and professional astronomers worldwide. Data on hundreds of objects extend from the AAVSO’s founding in 1911 or earlier (mid-1800s) to present. Some objects’ data are of shorter duration but of intense, high-precision coverage. Historical datasets come from published/unpublished professional/amateur observations, astronomical plate collections, and contributed archives of other variable star observing organizations. Hundreds of observations are added to the AID daily as observers upload their data in near real-time. Approximately 69% (~13.9M) of AID observations are visual, 30.4% (~6.2M) CCD (BVRI, unfiltered, Sloan colors, others), 0.5% (~75K) PEP (BVJH), and 0.1% (~17K) photographic/photovisual. Many objects have exclusively visual data, some PEP or CCD data only, and many a combination of types and bands. Objects range from young stellar objects through highly evolved stars. Included are intrinsic variables—pulsating (SX Phe stars through Miras and semiregulars) and eruptive (cataclysmic variables of all types)—and extrinsic variables—eclipsing binaries, rotating (RS CVns)—and exoplanets and suspected variables. Blazars, polars, quasars, HMXBs - today’s AID is a thriving, exciting resource! The AID is maintained in a dynamic MySQL database, easily accessible to contributors and users alike through the AAVSO website (http://www.aavso.org). The Light Curve Generator, Quick Look page (recent observations), and Data Download form offer different ways to view/investigate your targets. Quality control performed from submission through validation ensures reliable data for your research. Visit the AAVSO website if you need data; contact us if we may help you observe your targets. We are here for you!