The effect of metallicity on Cepheid magnitudes and the distance to M33
We present the results from a multi–epoch survey of two regions of M33 using the 3.5–m Wisconsin–Indiana–Yale–NOAO (WIYN) telescope. The inner field is located close to the centre of the galaxy, with the outer region situated about 5.1 kpc away in the southern spiral arm, allowing us to sample a lar...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2009-07, Vol.396 (3), p.1287-1296 |
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| creator | Scowcroft, V. Bersier, D. Mould, J. R. Wood, P. R. |
| description | We present the results from a multi–epoch survey of two regions of M33 using the 3.5–m Wisconsin–Indiana–Yale–NOAO (WIYN) telescope. The inner field is located close to the centre of the galaxy, with the outer region situated about 5.1 kpc away in the southern spiral arm, allowing us to sample a large metallicity range. We have data for 167 fundamental mode Cepheids in the two regions. The reddening–free Wesenheit magnitude Wvi period–luminosity (PL) relations were used to establish the distance modulus of each region, with μinner= 24.37 ± 0.02 mag and μouter= 24.54 ± 0.03 mag. The apparent discrepancy between these two results can be explained by the significant metallicity gradient of the galaxy. We determine a value for the metallicity parameter of the PL relation =−0.29 ± 0.11 mag dex−1, consistent with previous measurements. This leads to a metallicity corrected distance modulus to M33 of μγ= 24.53 ± 0.11 mag. |
| doi_str_mv | 10.1111/j.1365-2966.2009.14822.x |
| format | Article |
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R.</creatorcontrib><creatorcontrib>Wood, P. R.</creatorcontrib><title>The effect of metallicity on Cepheid magnitudes and the distance to M33</title><title>Monthly notices of the Royal Astronomical Society</title><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><description>We present the results from a multi–epoch survey of two regions of M33 using the 3.5–m Wisconsin–Indiana–Yale–NOAO (WIYN) telescope. The inner field is located close to the centre of the galaxy, with the outer region situated about 5.1 kpc away in the southern spiral arm, allowing us to sample a large metallicity range. We have data for 167 fundamental mode Cepheids in the two regions. The reddening–free Wesenheit magnitude Wvi period–luminosity (PL) relations were used to establish the distance modulus of each region, with μinner= 24.37 ± 0.02 mag and μouter= 24.54 ± 0.03 mag. The apparent discrepancy between these two results can be explained by the significant metallicity gradient of the galaxy. We determine a value for the metallicity parameter of the PL relation =−0.29 ± 0.11 mag dex−1, consistent with previous measurements. This leads to a metallicity corrected distance modulus to M33 of μγ= 24.53 ± 0.11 mag.</description><subject>Astronomy</subject><subject>catalogues</subject><subject>Cepheids</subject><subject>Chemical elements</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>galaxies: distances and redshifts</subject><subject>galaxies: individual: M33</subject><subject>Luminosity</subject><subject>Red shift</subject><subject>Telescopes</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNqNkV9r2zAUxcVYYVm77yAG7Zu9K8my7JdBCesflrZQMlr2IlT5qlXm2Kll0-TbT6lLHkbLqhcJ9DtHV-cQQhmkLK5vi5SJXCa8zPOUA5QpywrO0_UHMtldfCQTACGTQjH2iXwOYQEAmeD5hJzOH5Cic2h72jq6xN7Utbe-39C2oVNcPaCv6NLcN74fKgzUNBXto6byoTeNRdq39EKIA7LnTB3wy8u-T36d_JhPz5LZ1en59HiW2FwwntxlIMqqclVhVOksAiosmZTC2jg1SJOpOyy4QZ4ZcMIAMgYZV8ohGMiY2CdHo--qax8HDL1e-mCxrk2D7RC0yBTwGMF_QQ4sPpzLCH79B1y0Q9fET0RGRT8lVYSKEbJdG0KHTq86vzTdRjPQ2x70Qm_j1tu49bYH_dyDXkfp4Yu_CdbUroup-bDTc5YLCQoi933knnyNm3f764vL6-djNBCjQTus3pAnr42XjKrYJ653OtP90bkSSuqz29_Rpfh5czuf6RvxF8LZtz8</recordid><startdate>200907</startdate><enddate>200907</enddate><creator>Scowcroft, V.</creator><creator>Bersier, D.</creator><creator>Mould, J. 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| source | Oxford Journals Open Access Collection; Wiley Online Library Journals Frontfile Complete |
| subjects | Astronomy catalogues Cepheids Chemical elements Earth, ocean, space Exact sciences and technology galaxies: distances and redshifts galaxies: individual: M33 Luminosity Red shift Telescopes |
| title | The effect of metallicity on Cepheid magnitudes and the distance to M33 |
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