Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264..587s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 264, NO. 3/OCT1, P. 587, 1993
Astronomy and Astrophysics
Astronomy
7
Stars: Pre-Main-Sequence - Dust, Extinction - Ism: Individual: Parsamian 13S - Ism: Jets And Outflows - Infrared: Interstellar: Lines
Scientific paper
A low-resolution (λΔλ ˜ 160) 3-μm spectrum of the infrared source at the apex of the cometary nebula Parsamian 13S (PS13S) has been obtained. A simple H2O ice-coated grain model fitted to this spectrum demonstrates that H2O ice could adequately account for all the absorption between 2.4 and ˜3.2. μm, contradicting an earlier suggestion that an additional absorption feature near 2.7 μm (attributed to terminal OH groups) existed in the PS13S spectrum. The model also indicates the presence of substantial quantities of very cold (<30 K) dust grains around PS 13S, with spectral features remarkably similar to those arising in material in the Taurus dark cloud. The presence of additional absorption, which cannot be explained by H20 ice, longwards of 3.2 μm in the PS13S spectrum (a `long-wavelength wing') is an argument in support of the pre-main-sequence nature of PS13S; this additional absorption is not found in evolved, oxygen-rich objects. Infrared (1.25- and 2.2-μm) images of the Parsamian 13 region reveal a morphology consistent with the proposal that PS 13S is viewed through an edge-on dust disc, the central star being visible only at 2.2 μm, while most of the radiation at 1.25 μm is radiation from the central star scattered by nearby dust.
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