ÆSOPUS 2.0: Low-temperature Opacities with Solid Grains

Autor: Paola Marigo, Peter Woitke, Emanuele Tognelli, Léo Girardi, Bernhard Aringer, Alessandro Bressan

Publikováno v: The Astrophysical Journal, Vol 960, Iss 1, p 18 (2023)

In this study we compute the equation of state and Rosseland mean opacity from temperatures of T ≃ 30,000 K down to T ≃ 400 K, pushing the capabilities of the Æ SOPUS code into the regime where solid grains can form. The GGchem code is used to s

Externí odkaz: https://doaj.org/article/c648cb3297dd40a7a532c22615992159

The mass-loss, expansion velocities, and dust production rates of carbon stars in the Magellanic Clouds

Autor: Alessandro Bressan, Martin Groenewegen, Bernhard Aringer, Martha L. Boyer, Jacco Th. van Loon, Ambra Nanni, S. Rubele, S. R. Goldman

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2019, 487, pp.502-521. ⟨10.1093/mnras/stz1255⟩

The properties of carbon stars in the Magellanic Clouds (MCs) and their total dust production rates are predicted by fitting their spectral energy distributions (SED) over pre-computed grids of spectra reprocessed by dust. The grids are calculated as

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8963aa6fd836f0f3e1554dda7351f473
https://doi.org/10.1093/mnras/stz1255

Carbon star formation as seen through the non-monotonic initial–final mass relation

Autor: Giada Pastorelli, Sara Bladh, Jason S. Kalirai, Pierre Bergeron, Sihao Cheng, Léo Girardi, Piero Dal Tio, Bernhard Aringer, Alessandro Bressan, Pier-Emmanuel Tremblay, Enrico Ramirez-Ruiz, Paola Marigo, Jason L. Curtis, Michele Trabucchi, Yang Chen, Jeffrey D. Cummings

Publikováno v: Nature Astronomy

The initial-final mass relation (IFMR) links the birth mass of a star to the mass of the compact remnant left at its death. While the relevance of the IFMR across astrophysics is universally acknowledged, not all of its fine details have yet been res

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed8fc59a638087827978fcf4fbc0fb5c

A DARWIN C-star model grid with new dust opacities

Autor: Susanne Höfner, Bernhard Aringer, Kjell Eriksson

Publikováno v: Proceedings of the International Astronomical Union. 14:391-393

We have improved the treatment of dust opacity from the small-particle limit approximation to size-dependent which leads to models with smaller grains, lower dust-to-gas ratios, but about the same mass-loss rates and outflow velocities. The K-magnitu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0d2018050dbed3d1b58b7fd47a37982c
https://doi.org/10.1017/s1743921318007299

Carbon stars with increased oxygen and nitrogen abundances: Hydrostatic dust-free model atmospheres

Autor: Ambra Nanni, Léo Girardi, Walter Nowotny, M. Mecina, Bernhard Aringer, Paola Marigo

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2019, 487, pp.2133-2147. ⟨10.1093/mnras/stz1429⟩

We have computed a grid of hydrostatic spherical COMARCS models for C stars covering metallicities from [Z/H]=0 to -2 and values of the carbon excess [C-O] from 6.41 to 9.15, plus some temperature sequences, where the amount of oxygen and nitrogen is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eca4941a6c5b0dff1f95fd001507996c
http://hdl.handle.net/11577/3309172