Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period–Wesenheit–Metallicity Relation in the Gaia Bands
It is beneficial to calibrate the period–Wesenheit–metallicity relation (PWZR) of Delta Cephei stars (DCEPs), i.e., classical Cepheids, using accurate parallaxes of associated open clusters (OCs) from Gaia data release 3 (DR3). To this aim, we obtain a total of 43 OC–DCEPs (including 33 fundamental...
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IOP Publishing
2024-01-01
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| Online Access: | https://doi.org/10.3847/1538-3881/ad50d3 |
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| author | Huajian Wang Ye Xu Zehao Lin Chaojie Hao Dejian Liu Yingjie Li |
| author_facet | Huajian Wang Ye Xu Zehao Lin Chaojie Hao Dejian Liu Yingjie Li |
| author_sort | Huajian Wang |
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| description | It is beneficial to calibrate the period–Wesenheit–metallicity relation (PWZR) of Delta Cephei stars (DCEPs), i.e., classical Cepheids, using accurate parallaxes of associated open clusters (OCs) from Gaia data release 3 (DR3). To this aim, we obtain a total of 43 OC–DCEPs (including 33 fundamental mode, 9 first overtone mode, and 1 multimode DCEPs) and calibrate the PWZR as ${W}_{G}=(-3.356\pm 0.033)(\mathrm{log}P-1)+(-5.947\pm 0.025)$ + (−0.285 ± 0.064)[Fe/H]. The concurrently obtained residual parallax offset in OCs, zp = −4 ± 5 μ as, demonstrates the adequacy of the parallax corrections within the magnitude range of OC member stars. By comparing the field DCEPs’ DR3 parallaxes with their photometric parallaxes derived by our PWZR, we estimated the residual parallax offset in field DCEPs as zp = −15 ± 3 μ as. Using our PWZR, we estimate the distance modulus of the Large Magellanic Cloud to be 18.482 ± 0.040 mag, which aligns well with the most accurate published value obtained through geometric methods. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| spelling | doaj-art-bbffca0bc4534b97adbdfaf1571b0efc2025-01-30T15:12:31ZengIOP PublishingThe Astronomical Journal1538-38812024-01-0116813410.3847/1538-3881/ad50d3Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period–Wesenheit–Metallicity Relation in the Gaia BandsHuajian Wang0Ye Xu1https://orcid.org/0000-0001-5602-3306Zehao Lin2Chaojie Hao3Dejian Liu4Yingjie Li5https://orcid.org/0000-0001-7526-0120Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210008, People's Republic of China ; xuye@pmo.ac.cn; University of Science and Technology of China , 96 Jinzhai Road, Hefei 230026, People's Republic of ChinaPurple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210008, People's Republic of China ; xuye@pmo.ac.cn; University of Science and Technology of China , 96 Jinzhai Road, Hefei 230026, People's Republic of ChinaPurple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210008, People's Republic of China ; xuye@pmo.ac.cn; University of Science and Technology of China , 96 Jinzhai Road, Hefei 230026, People's Republic of ChinaPurple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210008, People's Republic of China ; xuye@pmo.ac.cn; University of Science and Technology of China , 96 Jinzhai Road, Hefei 230026, People's Republic of ChinaPurple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210008, People's Republic of China ; xuye@pmo.ac.cn; University of Science and Technology of China , 96 Jinzhai Road, Hefei 230026, People's Republic of ChinaPurple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210008, People's Republic of China ; xuye@pmo.ac.cnIt is beneficial to calibrate the period–Wesenheit–metallicity relation (PWZR) of Delta Cephei stars (DCEPs), i.e., classical Cepheids, using accurate parallaxes of associated open clusters (OCs) from Gaia data release 3 (DR3). To this aim, we obtain a total of 43 OC–DCEPs (including 33 fundamental mode, 9 first overtone mode, and 1 multimode DCEPs) and calibrate the PWZR as ${W}_{G}=(-3.356\pm 0.033)(\mathrm{log}P-1)+(-5.947\pm 0.025)$ + (−0.285 ± 0.064)[Fe/H]. The concurrently obtained residual parallax offset in OCs, zp = −4 ± 5 μ as, demonstrates the adequacy of the parallax corrections within the magnitude range of OC member stars. By comparing the field DCEPs’ DR3 parallaxes with their photometric parallaxes derived by our PWZR, we estimated the residual parallax offset in field DCEPs as zp = −15 ± 3 μ as. Using our PWZR, we estimate the distance modulus of the Large Magellanic Cloud to be 18.482 ± 0.040 mag, which aligns well with the most accurate published value obtained through geometric methods.https://doi.org/10.3847/1538-3881/ad50d3Cepheid variable starsCepheid distanceOpen star clusters |
| spellingShingle | Huajian Wang Ye Xu Zehao Lin Chaojie Hao Dejian Liu Yingjie Li Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period–Wesenheit–Metallicity Relation in the Gaia Bands The Astronomical Journal Cepheid variable stars Cepheid distance Open star clusters |
| title | Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period–Wesenheit–Metallicity Relation in the Gaia Bands |
| title_full | Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period–Wesenheit–Metallicity Relation in the Gaia Bands |
| title_fullStr | Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period–Wesenheit–Metallicity Relation in the Gaia Bands |
| title_full_unstemmed | Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period–Wesenheit–Metallicity Relation in the Gaia Bands |
| title_short | Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period–Wesenheit–Metallicity Relation in the Gaia Bands |
| title_sort | search for classical cepheids in galactic open clusters and calibration of the period wesenheit metallicity relation in the gaia bands |
| topic | Cepheid variable stars Cepheid distance Open star clusters |
| url | https://doi.org/10.3847/1538-3881/ad50d3 |
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