Tyck till om SwePub Sök här!
id:"swepub:oai:lup.lub.lu.se:adc2da87-7b26-400f-a886-bcd0eea6bbcd"
Sökning: id:"swepub:oai:lup.lub.lu.se:adc2da87-7b26-400f-a886-bcd0eea6bbcd" > Gaia -ESO Survey : ...
- 1 av 1
- Föregående post
- Nästa post
- Till träfflistan
Gaia -ESO Survey : Detailed elemental abundances in red giants of the peculiar globular cluster NGC 1851
-
- Tautvaišiene, G. (författare)
- Vilnius University,Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10257 Vilnius, Lithuania.
-
- Drazdauskas, A. (författare)
- Vilnius University,Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10257 Vilnius, Lithuania.
-
- Bragaglia, A. (författare)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna,INAF Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy.
- visa fler...
- visa färre...
- Vilnius University Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10257 Vilnius, Lithuania (creator_code:org_t)
- 2022-02-04
- 2022
- Engelska.
- Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 658
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Context. NGC 1851 is one of several globular clusters for which multiple stellar populations of the subgiant branch have been clearly identified and a difference in metallicity detected. A crucial piece of information on the formation history of this cluster can be provided by the sum of A(C+N+O) abundances. However, these values have lacked a general consensus thus far. The separation of the subgiant branch can be based on age and/or A(C+N+O) abundance differences. Aims. Our main aim was to determine carbon, nitrogen, and oxygen abundances for evolved giants in the globular cluster NGC 1851 in order to check whether or not the double populations of stars are coeval. Methods. High-resolution spectra, observed with the FLAMES-UVES spectrograph on the ESO VLT telescope, were analysed using a differential model atmosphere method. Abundances of carbon were derived using spectral synthesis of the C2 band heads at 5135 and 5635.5 Å. The wavelength interval 6470-6490 Å, with CN features, was analysed to determine nitrogen abundances. Oxygen abundances were determined from the [O I] line at 6300 Å. Abundances of other chemical elements were determined from equivalent widths or spectral syntheses of unblended spectral lines. Results. We provide abundances of up to 29 chemical elements for a sample of 45 giants in NGC 1851. The investigated stars can be separated into two populations with a difference of 0.07 dex in the mean metallicity, 0.3 dex in the mean C/N, and 0.35 dex in the mean s-process dominated element-to-iron abundance ratios [s/Fe]. No significant difference was determined in the mean values of A(C+N+O) as well as in abundance to iron ratios of carbon, α- and iron-peak-elements, and of europium. Conclusions. As the averaged A(C+N+O) values between the two populations do not differ, additional evidence is given that NGC 1851 is composed of two clusters, the metal-rich cluster being by about 0.6 Gyr older than the metal-poor one. A global overview of NGC 1851 properties and the detailed abundances of chemical elements favour its formation in a dwarf spheroidal galaxy that was accreted by the Milky Way.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- abundances
- evolution
- Globular clusters
- individual
- NGC 1851
- Stars
- stars: abundances
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
- Astronomy and Astrophysics (Sök värdpublikationen i LIBRIS)
Till lärosätets databas
- 1 av 1
- Föregående post
- Nästa post
- Till träfflistan
Hitta mer i SwePub
- Av författaren/redakt...
- Tautvaišiene, G.
- Drazdauskas, A.
- Bragaglia, A.
- Martell, S. L.
- Pancino, E.
- Lardo, C.
- visa fler...
- Minkevičiute, R.
- Stonkute, E.
- Ambrosch, M.
- Bagdonas, V.
- Chorniy, Y.
- Sanna, N.
- Franciosini, E.
- Smiljanic, R.
- Randich, S.
- Gilmore, G.
- Bensby, T.
- Bergemann, M.
- Gonneau, A.
- Guiglion, G.
- Carraro, G.
- Heiter, Ulrike
- Korn, Andreas, 1 ...
- Magrini, L.
- Morbidelli, L.
- Zaggia, S.
- visa färre...
- Om ämnet
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Fysik
- och Astronomi astrof ...
- Artiklar i publikationen
- Astronomy and As ...
- Av lärosätet
- Lunds universitet
- Uppsala universitet
Sök utanför SwePub
- Sök vidare i:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - Nationella bibliotekssystem
- LIBRIS.kb.se
