Photoelectric V photometry of 57 and 58 Tau

Between January 13 and 22 in 1989, new photoelectric photometry for 57 Tauri (=HD 27397, alpha(1950.0)=4h17m09s, delta=13deg55.0arcmin) and 58 Tauri (=HD 27459, alpha(1950.0)=4h17m46s, delta=14deg58.6arcmin) was made at the Xinlong Station of Beijing Astronomical Observatory, with the 60cm reflector and its classical single channel photoelectric photometer. The filter is Johnson V. The comparison star is HR1358 (=HD 27483).

After the raw magnitudes of the target stars were corrected for extinction by applying the nightly determined extinction coefficient from the comparison, 863 measurements of 57 Tau and 155 measurements of 58 Tau relative to HR 1358 were obtained, respectively. And then, nightly zero-point adjustments normalized to zero were made for the two measurement sets.