Near-infrared Stellar Populations in the Metal-poor, Dwarf Irregular Galaxies Sextans A and Leo A
| Autor: | Margaret Meixner, Olivia Jones, Helen Meskhidze, Martha L. Boyer, Matthew T. Maclay, Iain McDonald |
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| Rok vydání: | 2018 |
| Předmět: |
Metallicity
FOS: Physical sciences Astrophysics circumstellar matter 01 natural sciences Metal 0103 physical sciences 10. No inequality 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Physics stars [infrared] 010308 nuclear & particles physics Near-infrared spectroscopy mass-loss [stars] Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Interstellar medium Stars Leo A Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) visual_art visual_art.visual_art_medium late-type [stars] Production (computer science) Irregular galaxy |
| Zdroj: | The Astrophysical Journal Jones, O C, Maclay, M T, Boyer, M L, Meixner, M, McDonald, I & Meskhidze, H 2018, ' Near-infrared Stellar Populations in the Metal-poor, Dwarf Irregular Galaxies Sextans A and Leo A ', Astrophysical Journal, vol. 854, no. 2, 117 . https://doi.org/10.3847/1538-4357/aaa542 |
| ISSN: | 1538-4357 1538-3881 0004-6361 0004-637X 0067-0049 0002-7537 |
| DOI: | 10.3847/1538-4357/aaa542 |
| Popis: | We present JHK$_{s}$ observations of the metal-poor ([Fe/H] $10^{-11}$ $M_\odot \,{\rm yr}^{-1}$, confirming that metal-poor stars can form substantial amounts of dust. We also find tentative evidence for oxygen-rich dust formation at low metallicity, contradicting previous models that suggest oxygen-rich dust production is inhibited in metal-poor environments. The total rates of dust injection into the interstellar medium of Leo A and Sextans A are (8.2 $\pm$ 1.8) $\times 10^{-9}$ $M_\odot \,{\rm yr}^{-1}$ and (6.2 $\pm$ 0.2) $\times 10^{-7}$ $M_\odot \,{\rm yr}^{-1}$, respectively. The majority of this dust is produced by a few very dusty evolved stars, and does not vary strongly with metallicity. Comment: 21 pages, 11 figures, 10 tables; accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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