Lithium and beryllium in the Gaia-Enceladus galaxy. Issue 3 (16th June 2020)
- Record Type:
- Journal Article
- Title:
- Lithium and beryllium in the Gaia-Enceladus galaxy. Issue 3 (16th June 2020)
- Main Title:
- Lithium and beryllium in the Gaia-Enceladus galaxy
- Authors:
- Molaro, P
Cescutti, G
Fu, X - Abstract:
- ABSTRACT: Data from Gaia DR2 and The Apache Point Observatory Galactic Evolution Experiment surveys revealed a relatively new component in the inner Galactic halo, which is likely the dynamical remnant of a disrupted dwarf galaxy named Gaia-Enceladus that collided with the Milky Way about 10 Gyr ago. This merging event offers an extraordinary opportunity to study chemical abundances of elements in a dwarf galaxy, since they are generally hampered in external galaxies. Here, we focus on 7 Li and 9 Be in dwarf stars that are out of reach even in Local Group galaxies. Searching in GALAH, Gaia-ESO survey and in literature, we found several existing 7 Li abundance determinations of stars belonging to the Gaia-Enceladus galaxy. The 7 Li abundances of stars at the low metallicity end overlap with those of the Galactic halo. These are effective extragalactic 7 Li measurements, which suggest that the 7 Li Spite plateau is universal, as is the cosmological 7 Li problem. We found a 7 Li-rich giant out of 101 stars, which suggests a small percentage similar to that of the Milky Way. We also collect 9 Be abundance for a subsample of 25 Gaia-Enceladus stars from literature. Their abundances share the Galactic [Be/H] values at the low metallicity end but grow slower with [Fe/H] and show a reduced dispersion. This suggests that the scatter observed in the Milky Way could reflect the different 9 Be evolution patterns of different stellar components that are mixed-up in the Galactic halo.
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 496:Issue 3(2020)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 496:Issue 3(2020)
- Issue Display:
- Volume 496, Issue 3 (2020)
- Year:
- 2020
- Volume:
- 496
- Issue:
- 3
- Issue Sort Value:
- 2020-0496-0003-0000
- Page Start:
- 2902
- Page End:
- 2909
- Publication Date:
- 2020-06-16
- Subjects:
- stars: abundances -- Galaxy: halo -- Galaxy: stellar content -- galaxies: abundances -- galaxies: individual: Gaia-Enceladus -- primordial nucleosynthesis
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/staa1653 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 24947.xml