The Optical to Infrared Extinction Law of Magellanic Clouds Based on Red Supergiants and Classical Cepheids
Precise interstellar dust extinction laws are important to infer the intrinsic properties of reddened objects and correctly interpret observations. In this work, we attempt to measure the optical–infrared extinction laws of the Large and Small Magellanic Clouds (LMC and SMC) by using red supergiant...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acb647 |
| _version_ | 1797697160026783744 |
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| author | Shu Wang Xiaodian Chen |
| author_facet | Shu Wang Xiaodian Chen |
| author_sort | Shu Wang |
| collection | DOAJ |
| description | Precise interstellar dust extinction laws are important to infer the intrinsic properties of reddened objects and correctly interpret observations. In this work, we attempt to measure the optical–infrared extinction laws of the Large and Small Magellanic Clouds (LMC and SMC) by using red supergiant (RSG) stars and classical Cepheids as extinction tracers. The spectroscopic RSG samples are constructed based on the APOGEE spectral parameters, Gaia astrometric data, and multiband photometry. We establish the effective temperature–intrinsic color relations for RSG stars and determine the color excess ratio (CER) E ( λ − G _RP )/ E ( G _BP − G _RP ) for the LMC and SMC. We use classical Cepheids to derive base relative extinction ${A}_{{G}_{\mathrm{RP}}}/E({G}_{\mathrm{BP}}-{G}_{\mathrm{RP}})$ . The results are 1.589 ± 0.014 and 1.412 ± 0.041 for the LMC and SMC. By combining CERs with ${A}_{{G}_{\mathrm{RP}}}/E({G}_{\mathrm{BP}}-{G}_{\mathrm{RP}})$ , the optical–infrared extinction coefficients ${A}_{\lambda }/{A}_{{G}_{\mathrm{RP}}}$ are determined for 16 bands. We adjust the parameters of R _V -dependent extinction laws and obtain average extinction laws for the LMC and SMC of R _V = 3.40 ± 0.07 and R _V = 2.53 ± 0.10, respectively, which are consistent with Gordon et al. In the optical bands, the adjusted R _V extinction curves agree with the observations with deviations less than 3%. |
| first_indexed | 2024-03-12T03:36:17Z |
| format | Article |
| id | doaj.art-030781fcab3c44eea9d9685d7ebe2ab4 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:36:17Z |
| publishDate | 2023-01-01 |
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| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-030781fcab3c44eea9d9685d7ebe2ab42023-09-03T13:08:38ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194614310.3847/1538-4357/acb647The Optical to Infrared Extinction Law of Magellanic Clouds Based on Red Supergiants and Classical CepheidsShu Wang0https://orcid.org/0000-0003-4489-9794Xiaodian Chen1https://orcid.org/0000-0001-7084-0484CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China ; shuwang@nao.cas.cn, chenxiaodian@nao.cas.cn; Department of Astronomy, China West Normal University , Nanchong, People’s Republic of ChinaCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China ; shuwang@nao.cas.cn, chenxiaodian@nao.cas.cn; Department of Astronomy, China West Normal University , Nanchong, People’s Republic of China; School of Astronomy and Space Science, University of the Chinese Academy of Sciences , Beijing 101408, People’s Republic of China; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University , Beijing 102206, People’s Republic of ChinaPrecise interstellar dust extinction laws are important to infer the intrinsic properties of reddened objects and correctly interpret observations. In this work, we attempt to measure the optical–infrared extinction laws of the Large and Small Magellanic Clouds (LMC and SMC) by using red supergiant (RSG) stars and classical Cepheids as extinction tracers. The spectroscopic RSG samples are constructed based on the APOGEE spectral parameters, Gaia astrometric data, and multiband photometry. We establish the effective temperature–intrinsic color relations for RSG stars and determine the color excess ratio (CER) E ( λ − G _RP )/ E ( G _BP − G _RP ) for the LMC and SMC. We use classical Cepheids to derive base relative extinction ${A}_{{G}_{\mathrm{RP}}}/E({G}_{\mathrm{BP}}-{G}_{\mathrm{RP}})$ . The results are 1.589 ± 0.014 and 1.412 ± 0.041 for the LMC and SMC. By combining CERs with ${A}_{{G}_{\mathrm{RP}}}/E({G}_{\mathrm{BP}}-{G}_{\mathrm{RP}})$ , the optical–infrared extinction coefficients ${A}_{\lambda }/{A}_{{G}_{\mathrm{RP}}}$ are determined for 16 bands. We adjust the parameters of R _V -dependent extinction laws and obtain average extinction laws for the LMC and SMC of R _V = 3.40 ± 0.07 and R _V = 2.53 ± 0.10, respectively, which are consistent with Gordon et al. In the optical bands, the adjusted R _V extinction curves agree with the observations with deviations less than 3%.https://doi.org/10.3847/1538-4357/acb647Interstellar reddeningInterstellar dust extinctionReddening lawInterstellar extinctionRed supergiant starsLarge Magellanic Cloud |
| spellingShingle | Shu Wang Xiaodian Chen The Optical to Infrared Extinction Law of Magellanic Clouds Based on Red Supergiants and Classical Cepheids The Astrophysical Journal Interstellar reddening Interstellar dust extinction Reddening law Interstellar extinction Red supergiant stars Large Magellanic Cloud |
| title | The Optical to Infrared Extinction Law of Magellanic Clouds Based on Red Supergiants and Classical Cepheids |
| title_full | The Optical to Infrared Extinction Law of Magellanic Clouds Based on Red Supergiants and Classical Cepheids |
| title_fullStr | The Optical to Infrared Extinction Law of Magellanic Clouds Based on Red Supergiants and Classical Cepheids |
| title_full_unstemmed | The Optical to Infrared Extinction Law of Magellanic Clouds Based on Red Supergiants and Classical Cepheids |
| title_short | The Optical to Infrared Extinction Law of Magellanic Clouds Based on Red Supergiants and Classical Cepheids |
| title_sort | optical to infrared extinction law of magellanic clouds based on red supergiants and classical cepheids |
| topic | Interstellar reddening Interstellar dust extinction Reddening law Interstellar extinction Red supergiant stars Large Magellanic Cloud |
| url | https://doi.org/10.3847/1538-4357/acb647 |
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