CCD Photometry of T Tauri Variables in Orion

Details CCD Photometry of T Tauri Variables in Orion CCD Photometry of T Tauri Variables in Orion

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4311a&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #43.11; Bulletin of the American Astronomical Society, Vol. 24, p.798

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The 0.6m Perkin telescope at Van Vleck Observatory on the campus of Wesleyan University was used to study variable stars in the vicinity of the Orion nebula. CCD images of eleven fields, each 4.3 arc-minutes on a side, were obtained through a Cousins I filter on 20 to 30 nights during the 1991/92 Milky Way season. Exposures were typically three to five minutes in length and reached an I magnitude of about 17. Differential photometry with respect to local standards was done on the images using aperture photometry routines available in IRAF. More than 530 stars were measured, and the large majority are proper motion members of the Orion nebula cluster according to Jones and Walker (1988, AJ 95, 1755). Variable stars were identified using the criterion that the sigma of their night-to-night variations exceeded that expected from Poisson statistics by a factor of 3. By this criterion about 30\ found to be variables, with amplitudes ranging from 0.06 to over 2 mag. CCD images obtained with the 0.9m KPNO telescope through V and I filters were used to obtain colors for the stars at one epoch. A periodogram analysis to search for rotation periods is underway and results will be discussed. It is clear that both classical T Tauri stars and weak T Tauri stars are present in this region.

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