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

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arxiv astro-ph/0504085 v3 pith:DMOBXK6M submitted 2005-04-04 astro-ph

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

classification astro-ph
keywords tycho-2cross-calibrationobtainphotometryspectrophotometryaccurateanalysisanalyzing
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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).

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