The distance to the nebula M 1-78

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galactic Structure, H I Regions, H Ii Regions, Planetary Nebulae, Absorption Spectra, Astrometry, Far Infrared Radiation, Very Large Array (Vla)

Scientific paper

Based on the H I absorption spectrum, the authors derive a distance to the emission nebula M1-78 of 5 - 8 kpc. From this distance and the total far infrared flux density, the total luminosity is found to be of order 1×105L_sun;. M1-78 is therefore unlikely to be a planetary nebula, as had been suggested previously. The authors favour a classification as H II region instead. They suggest that M1-78 is possibly associated with an outer spiral arm.

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