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Type II Cepheids as Extragalactic Distance Candles

D. Majaess, D. G. Turner, David J. Lane

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Abstract

Potential Type II Cepheids are identified in surveys of the galaxies IC 1613, M33, M101, M106, M31, NGC 4603, and the SMC, complementing previous discoveries of Type II Cepheids in NGC 5128, NGC 3198, and the LMC. The most distant Type II Cepheid observed may be associated with NGC 4603 (d ≃ 29 Mpc). Preliminary results confirm that Type II Cepheids could play an important role as standard candles, in constraining the effects of metallicity on Cepheid distances to galaxies, and in mapping extinction. Subject headings: manuscript submitted for peer review 1.

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What this paper is about

Potential Type II Cepheids are identified in surveys of the galaxies IC 1613, M33, M101, M106, M31, NGC 4603, and the SMC, complementing previous discoveries of Type II Cepheids in NGC 5128, NGC 3198, and the LMC. The most distant Type II Cepheid observed may be associated with NGC 4603 (d ≃ 29 Mpc). Preliminary results confirm that Type II Cepheids could play an important role as standard candles, in constraining the effects of metallicity on Cepheid distances to galaxies, and in mapping extinction. Subject headings: manuscript submitted for peer review 1.

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Available abstract

Potential Type II Cepheids are identified in surveys of the galaxies IC 1613, M33, M101, M106, M31, NGC 4603, and the SMC, complementing previous discoveries of Type II Cepheids in NGC 5128, NGC 3198, and the LMC. The most distant Type II Cepheid observed may be associated with NGC 4603 (d ≃ 29 Mpc). Preliminary results confirm that Type II Cepheids could play an important role as standard candles, in constraining the effects of metallicity on Cepheid distances to galaxies, and in mapping extinction. Subject headings: manuscript submitted for peer review 1.

Key concepts: Cepheid variable, Cosmic distance ladder, Physics, Astrophysics, Extinction (optical mineralogy), Metallicity, Astronomy, Galaxy

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