A search for radial velocity variations in the central stars of southern planetary nebulae and planetary-like objects

Astronomy and Astrophysics – Astronomy

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Binary Stars, Planetary Nebulae, Radial Velocity, Southern Sky, Stellar Motions, Stellar Spectra, Double Stars, Nebulae

Scientific paper

Results are presented of a radial velocity analysis of moderate-dispersion spectra of the central stars of the southern planetary nebulae NGC 2346, 3132, and He2-36, as well as of the questionable or misclassified planetaries NGC 6164-5, PK 289-0°1, CN1-1, and VV1-7. With the exception of NGC 2346, a confirmed binary, and possibly NGC 3132 and He2-36, no compelling evidence could be found for large-amplitude radial velocity variations on a time-scale of ≡1 to ≡10 day. The averaged heliocentric velocities for each star are listed and compared with any extant values of the radial velocity of the star or nebula that could be found in the literature.

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