Zobrazeno 1 - 10
of 359
pro vyhledávání: '"Á Skúladóttir"'
The elusive properties of the first (Pop III) stars can be indirectly unveiled by uncovering their true descendants. To this aim, we exploit our data-calibrated model for the best-studied ultra-faint dwarf (UFD) galaxy, Bo\"otes I, which tracks the c
Externí odkaz:
http://arxiv.org/abs/2406.12960
The Gaia-Sausage-Enceladus merger was a major event in the history of the Milky Way. Studies on Milky Way satellite dwarf galaxies show that key elemental abundance patterns, which probe different nucleosynthetic channels, reflect the host galaxy's s
Externí odkaz:
http://arxiv.org/abs/2405.13641
Autor:
Skúladóttir, Ása, Koutsouridou, Ioanna, Vanni, Irene, Amarsi, Anish M., Lucchesi, Romain, Salvadori, Stefania, Aguado, David
The first (Pop III) stars formed only out of H and He and were likely more massive than present-day stars. Massive Pop III stars in the range 140-260 M$_\odot$ are predicted to end their lives as pair-instability supernovae (PISNe), enriching the env
Externí odkaz:
http://arxiv.org/abs/2404.19086
Autor:
Magrini, Laura, Bensby, Thomas, Brucalassi, Anna, Randich, Sofia, Jeffries, Robin, de Silva, Gayandhi, Skuladottir, Asa, Smiljanic, Rodolfo, Gonzalez, Oscar, Hill, Vanessa, Lagarde, Nadege, Tolstoy, Eline, Arroyo-Polonio, Jose' Maria, Baratella, Martina, Barnes, John R., Battaglia, Giuseppina, Baumgardt, Holger, Bellazzini, Michele, Biazzo, Katia, Bragaglia, Angela, Carter, Bradley, Casali, Giada, Cescutti, Gabriele, Danielski, Camilla, Mena, Elisa Delgado, Drazdauskas, Arnas, Gieles, Mark, Giribaldi, Riano, Hawkins, Keith, Hoeijmakers, H. Jens, Jablonka, Pascale, Kamath, Devika, Louth, Tom, Marino, Anna Fabiola, Martell, Sarah, Merle, Thibault, Montet, Benjamin, Murphy, Michael T., Nisini, Brunella, Nordlander, Thomas, D'Orazi, Valentina, Pino, Lorenzo, Romano, Donatella, Sacco, Germano, Sandford, Nathan R., Sollima, Antonio, Spina, Lorenzo, Tautvaivsiene, Grazina, Ting, Yuan-Sen, Tozzi, Andrea, Van der Swaelmen, Mathieu, Van Eck, Sophie, Watson, Stephen, Worley, C. Clare, Zocchi, Alice
The High-Resolution Multi-Object Spectrograph (HRMOS) is a facility instrument that we plan to propose for the Very Large Telescope (VLT) of the European Southern Observatory (ESO), following the initial presentation at the VLT 2030 workshop held at
Externí odkaz:
http://arxiv.org/abs/2312.08270
Previous work on the abundances of C, O, Na, Mg, Si, Ca, Ti, Cr, Mn, Fe, Ni, Cu, and Zn in low-alpha (accreted) and high-alpha (in situ born) halo stars is extended to include the abundances of Sc, V, and Co, enabling us to study the nucleosynthesis
Externí odkaz:
http://arxiv.org/abs/2312.07768
Autor:
Lucchesi, R., Jablonka, P., Skúladóttir, Á., Lardo, C., Mashonkina, L., Primas, F., Venn, K., Hill, V., Minniti, D.
Publikováno v:
A&A 686, A266 (2024)
We present our analysis of VLT/UVES and X-shooter observations of six very metal-poor stars, including four stars at [Fe/H]$\approx$$-3$ in the Fornax and Carina dwarf spheroidal (dSph) galaxies. To date, this metallicity range in these two galaxies
Externí odkaz:
http://arxiv.org/abs/2312.07676
Publikováno v:
The Astrophysical Journal Letters (2024), Volume 962, Issue 2, id.L26, 6 pp
The initial mass function (IMF) of the first Pop III stars remains a persistent mystery. Their predicted massive nature implies the existence of stars exploding as pair-instability supernovae (PISN), but no observational evidence had been found. Now,
Externí odkaz:
http://arxiv.org/abs/2312.05309
The metal-poor stars in the Galactic halo are thought to show the imprints of the first (PopIII) stars, and thus provide a glance at the first episodes of star formation. In this work, we aim at understanding whether all very metal-poor stars formed
Externí odkaz:
http://arxiv.org/abs/2309.07958
Publikováno v:
Monthly Notices of the Royal Astronomical Society (2023), Volume 525, Issue 1, pp.190-210
The nature of the first Pop III stars is still a mystery and the energy distribution of the first supernovae is completely unexplored. For the first time we account simultaneously for the unknown initial mass function (IMF), stellar mixing, and energ
Externí odkaz:
http://arxiv.org/abs/2309.00045
The first stars were likely more massive than those forming today and thus rapidly evolved, exploding as supernovae and enriching the surrounding gas with their chemical products. In the Local Group, the chemical signature of the first stars has been
Externí odkaz:
http://arxiv.org/abs/2305.07706