We study the chemical composition of 5 giant stars in the globular cluster Terzan 7 associated with the Sagittarius dwarf spheroidal galaxy ( Sgr dSph), based on high resolution UVES-VLT spectra. We confirm the metallicity found by previous high resolution investigations: [Fe/H] similar to -0.6. We also show that this cluster displays the same low alpha-element to iron ratio found in Sgr dSph field stars of similar metallicity, as well as the same low Ni/Fe ratio. These chemical signatures are characteristic of the Sgr dSph system, and appear to be shared both by the globular cluster Pal 12, which was most likely stripped from Sgr by tidal interaction, and by Pal 5, which may also have belonged in the past to the Sgr dSph system. Intriguingly even globular cluster Ruprecht 106, although not associated to Sgr, displays similar characteristics.

Sbordone, L., Bonifacio, P., Marconi, G., Buonanno, R., & Zaggia, S. (2005). Family ties: Abundances in Terzan 7, a Sgr dSph globular cluster. ASTRONOMY & ASTROPHYSICS, 437(3), 905-910 [10.1051/0004-6361:20042315].

Family ties: Abundances in Terzan 7, a Sgr dSph globular cluster

BUONANNO, ROBERTO;
2005

Abstract

We study the chemical composition of 5 giant stars in the globular cluster Terzan 7 associated with the Sagittarius dwarf spheroidal galaxy ( Sgr dSph), based on high resolution UVES-VLT spectra. We confirm the metallicity found by previous high resolution investigations: [Fe/H] similar to -0.6. We also show that this cluster displays the same low alpha-element to iron ratio found in Sgr dSph field stars of similar metallicity, as well as the same low Ni/Fe ratio. These chemical signatures are characteristic of the Sgr dSph system, and appear to be shared both by the globular cluster Pal 12, which was most likely stripped from Sgr by tidal interaction, and by Pal 5, which may also have belonged in the past to the Sgr dSph system. Intriguingly even globular cluster Ruprecht 106, although not associated to Sgr, displays similar characteristics.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/05 - Astronomia e Astrofisica
English
Con Impact Factor ISI
Galaxies: abundances galaxies: individual: Terzan 7; Galaxies: evolution; Galaxy: globular clusters: individual: Terzan 7; Stars: abundances; Stars: atmospheres
Sbordone, L., Bonifacio, P., Marconi, G., Buonanno, R., & Zaggia, S. (2005). Family ties: Abundances in Terzan 7, a Sgr dSph globular cluster. ASTRONOMY & ASTROPHYSICS, 437(3), 905-910 [10.1051/0004-6361:20042315].
Sbordone, L; Bonifacio, P; Marconi, G; Buonanno, R; Zaggia, S
Articolo su rivista
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/25690
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 57
social impact