Direct Distances to Nearby Galaxies Using Detached Eclipsing Binaries
نویسنده
چکیده
The DIRECT project aims to determine direct distances to two important galaxies in the cosmological distance ladder – M31 and M33 – using detached eclipsing binaries (DEBs) and Cepheids. We present the results of the first large-scale CCD-based search for variables in M33. We have observed two fields located in the central region of M33 for a total of 95 nights on the F. L. Whipple Observatory 1.2 m telescope and 36 nights on the Michigan-Dartmouth-MIT 1.3 m telescope. We have found a total of 544 variables, including 251 Cepheids and 47 eclipsing binaries. The catalog of variables is available online, along with finding charts and BVI light curve data (consisting of 8.2×10 individual measurements). The complete set of CCD frames is available upon request. Subject headings: binaries: eclipsing — Cepheids — distance scale — galaxies: individual (M33) — stars: variables: other
منابع مشابه
O ct 1 99 7 DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and
We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder – M31 and M33, using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, detached eclipsing binaries provide us with the potential to determine these distances with an accuracy better than 5%. The massive photometry obtained in o...
متن کاملM ar 1 99 7 DIRECT Distances to Nearby Galaxies Using Detached Eclipsing
We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder – M31 and M33, using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, detached eclipsing binaries provide us with the potential to determine these distances with an accuracy better than 5%. The massive photometry obtained in o...
متن کاملDirect Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. Ii. Variables in the Field M31a Based on the Observations Collected at the Michigan-dartmouth-mit (mdm) 1.3-meter Telescope and at the F. L. Whipple Observatory (flwo) 1.2-meter Telescope
We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder – M31 and M33, using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, detached eclipsing binaries provide us with the potential to determine these distances with an accuracy better than 5%. The massive photometry obtained in o...
متن کاملJa n 19 99 DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries
We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder – M31 and M33 – using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, DEBs provide us with the potential to determine these distances with an accuracy better than 5%. The extensive photometry obtained in order to detect DEBs ...
متن کاملDirect Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. Iv. Variables in the Field M31d
We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder – M31 and M33 – using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, DEBs provide us with the potential to determine these distances with an accuracy better than 5%. The extensive photometry obtained in order to detect DEBs ...
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