Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934506s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #345.06
Astronomy and Astrophysics
Astronomy
Scientific paper
This project uses a technique to solve for four transformation coefficients simultaneously for multiple nights of observations and a nightly zeropoint value. The observed values are transformed to a standard system based on the R and (R-I) Landolt standards and the instrumental (R-L) (CaH) color of the U42a system on the 0.9-meter telescope operated by the Southeastern Association for Research in Astronomy (SARA). Transformation coefficients are calculated for observations of standard and program stars from the Lowell 0.78-meter telescope operated by the National Undergraduate Research Observatory (NURO). The transformed NURO standard star observations are compared to those using the U42a system. Likewise, the NURO program stars are compared to matching stars observed with SARA's U55 camera, which has also been transformed to the standard system. We find that all the observations agree well and have been successfully converted to the standard system. The implementation of this new system will allow for greater ease when separating red dwarfs and giants using the (R-L) and (R-I) colors, and may permit more accurate modeling of absolute magnitudes for late M dwarfs as a function of (R-I).
Farris Laurel
Robertson Thomas
Spengler Chelsea
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