CCD photometry of the RR Lyrae stars in NGC 121 and the distance to the Small Magellanic Cloud

Details CCD photometry of the RR Lyrae stars in NGC 121 and the distance to the Small Magellanic Cloud CCD photometry of the RR Lyrae stars in NGC 121 and the distance to the Small Magellanic Cloud

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96..872w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Sept. 1988, p. 872-876.

Astronomy and Astrophysics

Astronomy

38

Astronomical Photometry, Blue Stars, Cepheid Variables, Giant Stars, Magellanic Clouds, Variable Stars, Brightness Distribution, Charge Coupled Devices, Stellar Magnitude

Scientific paper

CCD photometry of the RR Lyrae variables in the SMC cluster NGC 121 gives a true distance modulus for the cluster of 18.86±0.07 mag if = 0.6. Assuming the mean SMC distance to be the same as for NGC 121, then the difference in modulus between the LMC and the SMC, based on RR Lyraes alone, is 0.43±0.09 mag if RR Lyrae luminosities are independent of metallicity, or 0.31±0.10 mag if ΔMV(RR)/Δ[Fe/H] = 0.20. The latter estimate is in better agreement with the differential modulus found from Cepheids; however, a displacement between the mean distance of the SMC Cepheids and NGC 121 could provide an equally valid explanation for the difference.

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