Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
Volume 117, Issue 832, Pages 615-619Publisher
IOP PUBLISHING LTD
DOI: 10.1086/430370
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By analyzing a well-calibrated sample of 256 stars observed with both Hipparcos and HST, I show that Tycho-2 photometry and HST spectrophotometry are accurate and stable enough to obtain a precise cross-calibration. Based on this analysis, I obtain the following photometric zero points with respect to Vega 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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