On the distance to M33 determined from magnitude corrections to Hubble's original Cepheid photometry

Astronomy and Astrophysics – Astronomy

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Astrometry, Cepheid Variables, Stellar Magnitude, Stellar Spectrophotometry, Electrophotometry, Light Curve, Reference Stars

Scientific paper

New photoelectric photometry in Selected Area 45, and transfers from a faint photoelectric sequence adjacent to the south-preceding arm in M33 have been made to the comparison stars for Hubble's Cepheids in M33. Progressive magnitude corrections are required to Hubble's M33 scales. Hubble's Cepheid light curves have been corrected to the B photoelectric system, and new photometric parametes are given for 35 of his variables. Application of an adopted absolute P-L relation, calibrated by Martin, Warren, and Feast, to these data gives an apparent blue modulus of (m-M)M33AB = 25.35, which is 0.67 mag fainter than a previously adopted value. The consequences of this larger apparent distance modulus are discussed.

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