PLANETARY NEBULAE IN THE INNER MILKY WAY II: THE BULGE-DISK TRANSITION

Autor(es)

Cavichia, O. ^[1] ; Costa, R. D. D. ^[1] ; Maciel, W. J. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Astron, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA; v. 47, n. 1, p. 49-61, APR 2011.
• Citações Web of Science: 10

Resumo

In this work, a sample of planetary nebulae located in the inner-disk and bulge of the Galaxy is used in order to find the galactocentric distance which better separates these two populations, from the point of view of abundances. Statistical distance scales are used to study the distribution of abundances across the disk-bulge interface. A Kolmogorov-Smirnov test is used to find the distance at which the chemical properties of these regions better separate. The results of the statistical analysis indicate that, on the average, the inner population has lower abundances than the outer. Additionally, for the a-element abundances, the inner population does not follow the disk radial gradient towards the galactic center. Based on our results, we suggest a bulge-disk interface at 1.5 kpc, marking the transition between the bulge and inner-disk of the Galaxy as defined by the intermediate mass population. (AU)

• Processo FAPESP: 07/07704-2 - Populações e evolução do bojo e região central da Galáxia
• Beneficiário: Oscar Cavichia de Moraes
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 05/03194-4 - Abundâncias químicas de nebulosas planetárias na conexão bojo-disco
• Beneficiário: Oscar Cavichia de Moraes
• Modalidade de apoio: Bolsas no Brasil - Mestrado