Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.5104t&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #51.04; Bulletin of the American Astronomical Society, Vol. 25, p.1370
Astronomy and Astrophysics
Astronomy
Scientific paper
We present high resolution near-infrared spectroscopy of two young bipolar planetary nebulae M2-9 and M1-92. These longslit observations were made with the Cryogenic Grating Spectrometer on the 2.1m telescope at KPNO. We detect H_2 emission from both nebulae. We determine that this emission is radiatively excited in M2-9. Phillips et al. (1985) detected the 2.122microns line of H_2 in M2-9 using a 12 arcsec beam and speculated that this emission was confined to the central regions of the object. Using our longslit data, we conclude that the H_2 emission is actually not present in the core of the object, but rather is confined to the lobes of M2-9. We compare the spatial distribution of the H_2 to that of Brgamma and optical lines. We find that the H_2 emission in M1-92 is thermally excited. Previous work by Trammell et al. (1993) showed that the optical spectrum of M1-92 is dominated by shock emission produced in the lobes of the object. By comparing the optical line ratios to published shock models, we determined the velocity of this shock to be 80-100 kms({-) 1}. We now compare our measured H_2 line ratios with published shock models to estimate the shock velocity implied by the IR lines. By comparing the IR velocities to the velocities indicated by the optical lines, we unify studies of the shocked material at different wavelengths. This work was supported in part by NSF grant 91-15101.
Dinerstein Harriet L.
Goodrich Robert W.
Trammell Susan Rebecca
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