Spectropolarimetry of the post-main-sequence bipolar nebulae GL 618, M2-56, and M1-92

Details Spectropolarimetry of the post-main-sequence bipolar nebulae GL 618, M2-56, and M1-92 Spectropolarimetry of the post-main-sequence bipolar nebulae GL 618, M2-56, and M1-92

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402..249t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 1, p. 249-263.

Astronomy and Astrophysics

Astrophysics

38

Astronomical Polarimetry, Asymptotic Giant Branch Stars, Planetary Nebulae, Visible Spectrum, Bipolarity, Line Spectra, Space Density, Stellar Evolution

Scientific paper

New high-quality spectropolarimetry of the post-main-sequence bipolar nebulae GL 618, M2-56, and M1-92 is presented which permits accurate separation of the scattered and unscattered components. Shock emission dominates the optical line spectrum of the three nebulae and probably plays a significant role in their dynamical evolution. The central H II region spectrum for GL 6189 is isolated and T(stellar) of 36,000-40,000 and log (N/O) = 0.0 +/- 0.2 are derived. GL 618 and M2-56 have shock velocities of 40-60 km/s; that of M1-92 is 60-100 km/s. Log (N/O) is derived for different regions of the three nebulae. There is an apparent correlation of outflow velocity with chemical abundance.

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