Multiple Stellar Populations in Globular Clusters with JWST
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arXiv
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866909500274900992 |
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| author | Milone, A. P. |
| author_facet | Milone, A. P. |
| contents | I present the first evidence of multiple populations in the globular cluster (GCs) 47Tucanae based on images collected with the near-infrared camera (NIRCam) on board the James Webb Space Telescope (JWST). While NIRCam photometry is poorly sensitive to multiple populations among stars brighter than the main-sequence (MS) knee, the M-dwarfs more-massive than 0.1 solar masses define a wide F115W-F322W2 color range due to multiple populations. The star-to-star color differences are mostly due to the different amounts of water vapor (hence oxygen) that affect the spectra of M-dwarfs. The chromosome map unveils an extended first population (1P) composed of M-dwarfs with different metallicities and three main groups of second-population (2P) stars that are depleted in oxygen with respect to the 1P. I present the discovery of an MS of very-low-mass stars (masses smaller than 0.1 solar masses) and tentatively associated it with a sequence composed of O-rich stars alone. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_07770 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Multiple Stellar Populations in Globular Clusters with JWST Milone, A. P. Solar and Stellar Astrophysics Astrophysics of Galaxies I present the first evidence of multiple populations in the globular cluster (GCs) 47Tucanae based on images collected with the near-infrared camera (NIRCam) on board the James Webb Space Telescope (JWST). While NIRCam photometry is poorly sensitive to multiple populations among stars brighter than the main-sequence (MS) knee, the M-dwarfs more-massive than 0.1 solar masses define a wide F115W-F322W2 color range due to multiple populations. The star-to-star color differences are mostly due to the different amounts of water vapor (hence oxygen) that affect the spectra of M-dwarfs. The chromosome map unveils an extended first population (1P) composed of M-dwarfs with different metallicities and three main groups of second-population (2P) stars that are depleted in oxygen with respect to the 1P. I present the discovery of an MS of very-low-mass stars (masses smaller than 0.1 solar masses) and tentatively associated it with a sequence composed of O-rich stars alone. |
| title | Multiple Stellar Populations in Globular Clusters with JWST |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2304.07770 |