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Session 72 - Late Type Stars and Planetary Nebulae.
Display session, Thursday, June 13
Tripp Commons,
As part of a snapshot survey, the two compact planetary nebulae (PNe) Hu 2-1 and M 1-58 were imaged using HST's Planetary Camera. The images show, for the first time, the spatial structure of these young PNe. M 1-58 was imaged in H\beta and shows a partially filled circular shell with an angular radius of 1.^\prime\prime7 and a thickness of 1^\prime\prime. There is also a halo extending out 4^\prime\prime from the center. At an estimated distance of 4 kpc, the radius of the shell is 0.033 pc. Hu 2-1 was imaged using two filters --- H\beta and [O III] 5007ÅHu 2-1 displays an equatorial ring with bubbles of gas above and below the ring. The dimensions of the ring are 1.^\prime\prime5 \times 0.^\prime\prime73 which, if actually circular, implies a tilt of 60\deg. The bubbles extend 2.^\prime\prime2 from the central star and a halo, brighter in the equatorial plane, extends out several arc-seconds further. The morphologies of He 2-1 and M 1-58 are quite different. M 1-58 appears rather amorphous, circularly symmetric, and filamentary. Hu 2-1, on the other hand, is quite asymmetric, and bears a striking resemblance to He 3-1357 --- another compact PN that was spatially resolved in the same snapshot survey.
These observations were made with the NASA/ESA Hubble Space Telescope and obtained at the Space Telescope Science Institute which is operated by the Association of Universities for Research in Astronomy, Inc.\ under NASA contract NAS5-26555. Support for this work was provided by NASA through grant number GO-3603.01-91A from the Space Telescope Science Institute.
