Roberts 22 - A bipolar nebula with OH emission

Details Roberts 22 - A bipolar nebula with OH emission Roberts 22 - A bipolar nebula with OH emission

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192..505a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 192, Aug. 1980, p. 505-519.

Astronomy and Astrophysics

Astronomy

45

Hydroxyl Emission, Infrared Astronomy, Interstellar Masers, Nebulae, Stellar Evolution, Stellar Spectrophotometry, Supergiant Stars, Balmer Series, Emission Spectra, Photoionization

Scientific paper

Roberts 22 is a bipolar reflection nebula which shows strong OH maser emission (OH 284.18-0.79) on the 1612 and 1665 MHz transitions, over a velocity range of -30 to +20 km/s, LSR. A refinement of its position yields the mean of three independent estimates measured at both 1612 and 1665 MHz of 10h 19m 45.1s plus or minus 1.2s; -57 deg 50 min 28 sec plus or minus 10 sec (1950). From an analysis of the properties of Roberts 22, other bipolar nebulae are investigated as to the derivation of spectral types for their underlying stars by the assumption of photoionization of the gas, and their evolutionary description as protoplanetary nebulae. It is suggested that Roberts 22 provides a yardstick by which subsequent discoveries of similar objects may be classified.

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