Bibcode
García-Díaz, Ma. T.; Gutiérrez, L.; Steffen, W.; López, J. A.; Beckman, J. E.
Referencia bibliográfica
The Astrophysical Journal, Volume 798, Issue 2, article id. 129, 9 pp. (2015).
Advertised on:
1
2015
Revista
Número de citas
3
Número de citas referidas
2
Descripción
We present measurements of internal proper motions at more than 500
positions of NGC 2392, the Eskimo Nebula, based on images acquired with
WFPC2 on board the Hubble Space Telescope at two epochs separated by
7.695 yr. Comparisons of the two observations clearly show the expansion
of the nebula. We measured the amplitude and direction of the motion of
local structures in the nebula by determining their relative shift
during that interval. In order to assess the potential uncertainties in
the determination of proper motions in this object, in general, the
measurements were performed using two different methods, used previously
in the literature. We compare the results from the two methods, and to
perform the scientific analysis of the results we choose one, the
cross-correlation method, because it is more reliable. We go on to
perform a "criss-cross" mapping analysis on the proper motion vectors,
which helps in the interpretation of the velocity pattern. By combining
our results of the proper motions with radial velocity measurements
obtained from high resolution spectroscopic observations, and employing
an existing 3D model, we estimate the distance to the nebula to be 1.3
kpc.
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Prof.
John E. Beckman