M 1-16 - Multiple shocked outflows from an evolved object

Details M 1-16 - Multiple shocked outflows from an evolved object M 1-16 - Multiple shocked outflows from an evolved object

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264l...1s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. L1-L4.

Astronomy and Astrophysics

Astronomy

25

Infrared Astronomy, Planetary Nebulae, Shock Wave Propagation, Stellar Evolution, Astronomical Spectroscopy, Millimeter Waves, Spectral Energy Distribution, Stellar Luminosity

Scientific paper

Optical, IR, and mm waves observations of M 1-16 are presented and the obtained data used to show that this is a transition object or proto-planetary nebula. The object is actively ejecting a nebula in three separate events, visible in narrow band images as radially opposite sets of bubbles or lobes. Long slit spectra of these bubbles show a symmetrical radial velocity difference of 500 km/s at their extremes and typical shocked line profiles with a projected shock velocity of 230 km/s. Reddening, scale and size are used to determine the distance to M1-16. Combining this distance with the object's apparent luminosity, it is found that M1-16 is severely subluminous. It is concluded that M1-16 is a binary system and that, in general, bipolar transition objects are members of such systems, and that they will form bipolar PNe.

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