The multiple molecular winds of CRL 2688

Details The multiple molecular winds of CRL 2688 The multiple molecular winds of CRL 2688

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..265y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 265-272.

Astronomy and Astrophysics

Astrophysics

66

Asymptotic Giant Branch Stars, Molecular Gases, Planetary Nebulae, Rotational Spectra, Stellar Evolution, Stellar Mass Ejection, Carbon Isotopes, Carbon Monoxide, Hydrocyanic Acid, Nitrogen Isotopes, Radiation Pressure, Stellar Winds

Scientific paper

Three rotational transitions of (C-12)(O-16), two of (C-13)(O-16), and one of (H-1)(C-12)(N-14) were observed toward the proto-planetary nebula CRL 2688. The spectra reveal a previously undetected wing of emission representing an outflow velocity of about 100 km/s. The mechanical momentum in this wind appears to be too large to be supplied by radiation pressure. Also observed is an absorption feature which is on the blueshifted side of the spectrum with respect to the systemic velocity. This feature is interpreted as due to the low-velocity wind absorbing radiation from higher velocity gas near the star. High-resolution spectra of this absorption feature show that its blue edge is very sharp, providing a tight constraint on the turbulent velocity of the low-velocity stellar wind.

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