Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287..371p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 2, p. 371-386
Astronomy and Astrophysics
Astronomy
26
Astronomical Photometry, Cepheid Variables, Distance, Galaxies, Local Group (Astronomy), Charge Coupled Devices, Interstellar Extinction, Magellanic Clouds, Stellar Luminosity, Stellar Magnitude
Scientific paper
Five Cepheids in Sextans A and three in Sextans B, already discovered and studied by Sandage & Carlson (1982, 1985), have been measured into a new photometric CCD sequence in B. A zero point offset of 0.22 magnitudes has been detected with respect to previous photographic photometry (CCD magnitudes being brighter). Five additional Cepheid candidates in Sextans A and four in Sextans B have been identified and preliminary periods have been proposed. The new Cepheids allow to extend the period-luminosity relation to one magnitude fainter. For all the variables, single epoch V, R, and I magnitudes are derived. Apparent B, V, and I distance moduli relative to the Large Magellanic Cloud (LMC) have been calculated. Combining the data at different wavelength and assuming a true distance modulus of 18.5 mag for the LMC, we obtain a true distance modulus, corrected for the effects of interstellar extinction, of (m-M)0 = 25.71 +/- 0.20 for Sextans A and (m-M)0 = 25.63 +/- 0.21 for Sextans B. The resulting distances are 20% shorter than previously suggested by Sandage and Carlson. Adopting E(B-V) = 0.08 for the LMC, the interstellar reddening for the Cepheids in Sextans A is E(B-V) = 0.02, and in Sextans B E(B-V) = 0.01. Adopting the above distance moduli and reddening, the absolute magnitudes of the brightest stars are: (MB(3)) = -7.44 for the three brightest blue and (MV(3)) = -7.28 for the three brightest red stars in Sextans A; for Sextans B it is (MB(3)) = -6.39 and (MV(3)) = -6.43.
Capaccioli Massimo
Pellegrini Carla
Piotto Giampaolo
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