7Be in the outburst of the ONe nova V6595 Sgr
| Autor: | M. Della Valle, P. Selvelli, Piercarlo Bonifacio, E. Aydi, G. Cescutti, E. J. Harvey, Paolo Molaro, Valentina D'Odorico, Luca Izzo, Margarita Hernanz |
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| Přispěvatelé: | Villum Fonden, Ministerio de Ciencia, Innovación y Universidades (España), Molaro, P., Izzo, L., D'Odorico, V., Aydi, E., Bonifacio, P., Cescutti, G., Harvey, E. J., Hernanz, M., Selvelli, P., Della Valle, M., ITA, USA, ESP |
| Rok vydání: | 2021 |
| Předmět: |
GIANT
Astrophysics nuclear reaction Spectral line nucleosynthesis abundances Neon ABSORPTION ELEMENTS Abundances Emission spectrum Absorption (electromagnetic radiation) Novae Physics cataclysmic variables GAMMA-RAY LINES Isotope ORIGIN nucleosynthesis stars individual V6595 Sgr Astrophysics - Solar and Stellar Astrophysics Stars: individual: V6595 Sgr novae cataclysmic variable stars abundance Nucleosynthesis Cataclysmic variable V5668 SGR LI-7 chemistry.chemical_element evolution [Galaxy] Galaxy evolution LITHIUM stars abundances nucleosynthesis abundance nuclear reactions Galaxy: evolution novae abundances novae cataclysmic variables Stars: abundances Resonance Astronomy and Astrophysics Nova (laser) K-line EVOLUTION abundances [stars] individual: V6595 Sgr [stars] chemistry Space and Planetary Science EMISSION |
| Zdroj: | Molaro, P, Izzo, L, D'Odorico, V, Aydi, E, Bonifacio, P, Cescutti, G, Harvey, E J, Hernanz, M, Selvelli, P & della Valle, M 2021, ' Be-7 in the outburst of the ONe nova V6595 Sgr ', Monthly Notices of the Royal Astronomical Society, vol. 509, no. 3, pp. 3258-3267 . https://doi.org/10.1093/mnras/stab3106 Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stab3106 |
| Popis: | We report on the search for the 7Be ii isotope in the outbursts of the classical nova V6595 Sgr by means of high-resolution Ultraviolet and Visual Echelle Spectrograph (UVES) observations taken at the European Southern Observatory's Very Large Telescope in 2021 April, about two weeks after its discovery and under difficult circumstances due to the pandemic. Narrow absorption components with velocities at -2620 and-2820 km s-1, superposed on broader and shallow absorption, are observed in the outburst spectra for the 7Be ii λλ313.0583, 313.1228 nm doublet resonance lines, as well as in several other elements such as Ca ii, Fe i, Mg i, Na i, H i and Li i. Using the Ca ii K line as a reference element, we infer N(7Be)/N(H) ≈ 7.4 × 10-6, or ≈ 9.8 × 10-6 when the 7Be decay is taken into account. The 7Be abundance is about half of the value most frequently measured in novae. The possible presence of overionization in the layers where 7Be ii is detected is also discussed. Observations taken at the Telescopio Nazionale Galileo in La Palma 91 days after discovery showed prominent emission lines of oxygen and neon, which allow us to classify the nova as ONe type. Therefore, although 7Be is expected to be higher in CO novae, it is found at comparable levels in both nova types. LI was supported by two grants from VILLUM FONDEN (project number 16599 and 25501). M. H. acknowledges support from grant PID2019-108709GB-100 from MICINN (Spain). |
| Databáze: | OpenAIRE |
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