Bibcode
Manchado, A.; Stanghellini, L.; Villaver, E.; Garcia-Segura, G.; Shaw, R.; García-Hernández, D. A.
Referencia bibliográfica
Asymmetrical Planetary Nebulae VI conference, Proceedings of the conference held 4-8 November, 2013. Edited by C. Morisset, G. Delgado-Inglada and S. Torres-Peimbert. Online at http://www.astroscu.unam.mx/apn6/PROCEEDINGS/, id. #56
Fecha de publicación:
4
2014
Número de citas
0
Número de citas referidas
0
Descripción
We present high spatial resolution (~60-90 milliarcseconds) images of
the molecular hydrogen emission in the planetary nebula NGC 2346.
Molecular hydrogen images in the (1-0)S(1) 2.218um line were recently
obtained during the Scientific Verification of the new instrument at
Gemini South; Gemini South Adaptive Optics Imager (GSAOI). GSAOI was
used with Gemini Multi-conjugate Adaptive Optics System (GeMS). GSAOI
has 2 x 2 mosaic Rockwell HAWAII-2RG 2048 x 2048 arrays as the detector,
with a pixel scale of 0.02"/pixel, thus providing a FOV of 85" x 85".
The total exposure time (on-target) was 1200 seconds and the final
spatial resolution over the whole FOV (after the combination of 10
dithered positions) was ~60-90 milliarcseconds. NGC 2346 is at a
distance of 700 pc, thus the spatial resolution corresponds to ~28
Astronomical Units (slightly better than the NGC 2346 Halpha image
obtained by the HST/WFPC2). With this unprecedented resolution, we were
able to resolve for the first time the molecular knots and filaments
that are expected to be formed after the fast wind ceases. We find that
the evolutionary status of the central star is inconsistent with the
dynamical age (2500 yrs), derived from the molecular hydrogen knots and
that the mass and orbital separation of the binary is compatible with a
system that might have evolved through the common envelope phase.