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pro vyhledávání: '"Garcia Hernandez, D."'
The atmospheres of phosphorus-rich stars have been shown to contain between 10 and 100 times more P than our Sun. Given its crucial role as an essential element for life, it is especially necessary to uncover the origin of P-rich stars to gain insigh
Externí odkaz:
http://arxiv.org/abs/2408.12938
Autor:
Foster, Steve, Schiavon, Ricardo P., de Castro, Denise B., Lucatello, Sara, Daher, Christine, Penoyre, Zephyr, Price-Whelan, Adrian, Badenes, Carles, Fernández-Trincado, JJ. G., García-Hernández, D. A., Holtzman, Jon, Jönsson, Henrik, Shetrone, Matthew
Carbon abundances in first-ascent giant stars are usually lower than those of their main-sequence counterparts. At moderate metallicities, stellar evolution of single stars cannot account for the existence of red-giant branch stars with enhanced carb
Externí odkaz:
http://arxiv.org/abs/2407.18130
Autor:
Tosi, Silvia, Dell'Agli, Flavia, Kamath, Devika, Stanghellini, Letizia, Ventura, Paolo, Bianchi, Stefano, Gómez-Muñoz, Marco A., García-Hernández, D. A.
Planetary nebulae (PNe) have three main components: a central star (CS), ionised gas and dust in the nebula. Each of them contains critical chemical fingerprints of their evolution, serving as tracers of the evolution, nucleosynthesis and dust produc
Externí odkaz:
http://arxiv.org/abs/2405.03640
Autor:
Mohorian, Maksym, Kamath, Devika, Menon, Meghna, Ventura, Paolo, Van Winckel, Hans, García-Hernández, D. A., Masseron, Thomas
Dusty post-red giant branch (post-RGB) stars are low- and intermediate-mass stars where the RGB evolution was prematurely terminated by a poorly understood binary interaction. These binary stars are considered to be low-luminosity analogues of post-a
Externí odkaz:
http://arxiv.org/abs/2403.09999
Publikováno v:
A&A 682 (2024) L18
Fullerenes have been observed in several astronomical objects since the discovery of C$_{60}$ in the mid-infrared (mid-IR) spectrum of the planetary nebula (PN) Tc 1. It has been suggested that the carriers of the broad unidentified infrared (UIR) pl
Externí odkaz:
http://arxiv.org/abs/2402.14943
Publikováno v:
MNRAS 528 (2024) 2871-2881
Several planetary nebulae (PNe) have been found to contain both polycyclic aromatic hydrocarbon (PAH-like) species and fullerenes (C$_{60}$) distinguished by their mid-infrared emission. Previous laboratory and astronomical studies suggest that the f
Externí odkaz:
http://arxiv.org/abs/2401.09868
Autor:
Dell'Agli, F., Tosi, S., Kamath, D., Stanghellini, L., Bianchi, S., Ventura, P., Marini, E., García-Hernández, D. A.
We present a novel approach to address dust production by low- and intermediate-mass stars. We study the asymptotic giant branch (AGB) phase, during which the formation of dust takes place, from the perspective of post-AGB and planetary nebula (PN) e
Externí odkaz:
http://arxiv.org/abs/2310.03454
Autor:
Barzaga, R., Garcia-Hernandez, D. A., Diaz-Tendero, S., Sadjadi, S., Manchado, A., Alcami, M., Gomez-Muñoz, M. A., Huertas-Roldan, T.
Small metal-containing molecules have been detected and recognized as one of the hybrid species efficiently formed in space; especially in the circumstellar envelopes of evolved stars. It has been predicted also that more complex hybrid species like
Externí odkaz:
http://arxiv.org/abs/2309.11265
Autor:
Garcia-Hernandez, D. A., Rao, N. Kameswara, Lambert, D. L., Eriksson, K., Reddy, A. B. S., Masseron, T.
Optical and near-IR photometry suggests that the carbon star DY Persei exhibits fadings similar to those of R Coronae Borealis (RCB) variables. Photometric surveys of the Galaxy and Magellanic Clouds uncovered new DY Per variables with infrared photo
Externí odkaz:
http://arxiv.org/abs/2303.12436
Autor:
Brauner, Maren, Masseron, Thomas, García-Hernández, D. A., Pignatari, Marco, Womack, Kate A., Lugaro, Maria, Hayes, Christian R.
Publikováno v:
A&A 673, A123 (2023)
The origin of phosphorus, one of the essential elements for life on Earth, is currently unknown. Prevalent models of Galactic chemical evolution (GCE) underestimate the amount of P compared to observations. The recently discovered P-rich ([P/Fe] > 1
Externí odkaz:
http://arxiv.org/abs/2303.12590