Kinematics and chemical abundances of the B star HD 28248

Autor(es)

Levenhagen, R. S. ^[1] ; Kuenzel, R. ^[2] ; Leister, N. V. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Depto Ciencias Exatas & Terra, BR-09972270 Diadema, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NEW ASTRONOMY; v. 21, p. 27-32, JUL 2013.
• Citações Web of Science: 1

Resumo

We perform a detailed elemental abundance study of the early-type B star HD 28248 and estimate its orbital path in the Galaxy. From the comparison of spectroscopic observations performed at the European Southern Observatory at La Silla in 2001/Oct/07 with non-LTE synthetic spectra using a new wrapper for the simultaneous fitting of several lines of a given atomic species, the abundances of He, C, N, O, Mg, Al, Si, P, S, Ar and Fe were determined for the first time. The radial velocity of HD 28248 has been also estimated from the positions of centroids of nine neutral helium lines and Mg II lambda 4481 angstrom, allowing to calculate its right-handed Galactic space-velocity components U, V and W and estimate its orbital path in the Galaxy for the first time. Our chemical analysis depicted an outstanding enrichment of several atomic species, particularly {[}Fe/H] = +0.25 dex and {[}O/Fe] = +0.32 dex. The kinematic parameters show that its orbit is confined to the galactic disk with a scale height of 400 pc and the star has moved about 4 kpc from its birthplace to the current position. The elemental abundances do not follow the predicted {[}Fe/H] and {[}O/Fe] gradients currently established for the Galaxy. A hypothetical scenario for the contamination could be the mass transfer in a binary system during previous evolutionary phases. (C) 2012 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 98/10138-8 - Espectroscopia de média e alta resolução: abundâncias químicas e populações estelares
• Beneficiário: Beatriz Leonor Silveira Barbuy
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/06816-4 - Atenuação e espalhamento da radiação por materiais nanoestruturados.
• Beneficiário: Roseli Kunzel
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado