Long-period Variable Stars in NGC 147 and NGC 185. II. Their Dust Production
This study presents a comparative analysis of mass-loss and dust production rates in the dwarf galaxies NGC 147 and NGC 185, focusing on long-period variables (LPVs) and pulsating asymptotic giant branch stars as primary indicators of dust feedback into the interstellar medium. For NGC 147, the tota...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/407457 |
| Acceso en línea: | http://hdl.handle.net/10261/407457 https://api.elsevier.com/content/abstract/scopus_id/105018377143 |
| Access Level: | acceso abierto |
| Palabra clave: | Interstellar medium Asymptotic giant branch stars Long period variable stars Stellar mass loss Dust formation |
| Sumario: | This study presents a comparative analysis of mass-loss and dust production rates in the dwarf galaxies NGC 147 and NGC 185, focusing on long-period variables (LPVs) and pulsating asymptotic giant branch stars as primary indicators of dust feedback into the interstellar medium. For NGC 147, the total mass-loss rate is calculated as (9.44 ± 3.78) × 10<sup>−4</sup> M<inf>⊙</inf> yr<sup>−1</sup>, with LPV luminosities ranging from (6.20 ± 0.25) × 10<sup>2</sup> L<inf>⊙</inf> to (7.87 ± 0.32) × 10<sup>3</sup> L<inf>⊙</inf>. In NGC 185, the total mass-loss rate is higher, at (1.58 ± 0.63) × 10<sup>−3</sup> M <inf>⊙</inf> yr<sup>−1</sup>, with LPV luminosities spanning (5.68 ± 0.23) × 10<sup>2</sup> L<inf>⊙</inf> to (1.54 ± 0.66) × 10<sup>4</sup> L<inf>⊙</inf>. A positive correlation is observed between stellar luminosity, intrinsic reddening due to circumstellar dust self-extinction, and elevated mass-loss rates. Additionally, comparisons of calculated dust injection rates, two-dimensional dust distribution maps, and observed dust masses provide evidence for a gravitational interaction between NGC 147 and the Andromeda galaxy, which influences the dust distribution within the system. |
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