A cross-calibration between Tycho-2 photometry and HST spectrophotometry

Abstract

I show that Tycho-2 photometry and HST spectrophotometry are accurate and stable enough to obtain a precise cross-calibration by analyzing a well-calibrated sample of 256 stars observed with both Hipparcos and HST. Based on this analysis, I obtain the following photometric zero points in the Vega magnitude system for Tycho-2: 0.020+-0.001 (B_T-V_T), 0.078+-0.009 (B_T), and 0.058+-0.009 (V_T).

arXiv comment11 pages, 4 figures, to appear in Publications of the Astronomical Society of the Pacific (June 2005 issue)

References in corpus (2)

• Spectral Irradiance Calibration in the Infrared. XIV: the Absolute Calibration of 2MASS
• CHORIZOS: a CHi-square cOde for parameteRized modelIng and characteriZation of phOtometry and Spectrophotometry

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