Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1108s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, Aug. 1983, p. 1108-1125.
Astronomy and Astrophysics
Astronomy
56
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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