Bibcode
Hensley, K.; Balick, B.; Henry, R. B. C.; Corradi, R. L. M.; Kwitter, K. B.
Referencia bibliográfica
The Astrophysical Journal, Volume 807, Issue 2, article id. 181, 11 pp. (2015).
Fecha de publicación:
7
2015
Revista
Número de citas
23
Número de citas referidas
14
Descripción
We present spectroscopy of nine planetary nebulae (PNe) in the outskirts
of M31, all but one obtained with the 10.4 m GTC telescope. These
sources extend our previous study of the oxygen abundance gradient of
M31 to galactocentric radii as large as 100 kpc. None of the targets are
bona fide members of a classical, metal-poor, and ancient halo. Two of
the outermost PNe have solar oxygen abundances, as well as radial
velocities consistent with the kinematics of the extended disk of M31.
The other PNe have a slightly lower oxygen content ([O/H] ∼ -0.4)
and in some cases large deviations from the disk kinematics. These PNe
support the current view that the external regions of M31 are the result
of a complex interaction and merger process, with evidence for a
widespread population of solar-metallicity stars produced in a starburst
that occurred ∼2 Gyr ago.
Proyectos relacionados
Nebulosas Bipolares
Nuestro proyecto persigue tres objetivos principales: 1) Determinar las condiciones físico-químicas de las nebulosas planetarias con geometría bipolar y de las nebulosas alrededor de estrellas simbióticas. El fin es entender el origen de la bipolaridad y poner a prueba los modelos teóricos que intentan explicar la morfología y la cinemática nebular
Antonio
Mampaso Recio