High-resolution observations of CO from the bipolar nebula CRL 2688

Kawabe, R.; Ishiguro, M.; Kimura, Takashi; Morita, Koh-Ichiro; Ukita, Nobuharu; Kobayashi, Hiroshi; Okumura, Shin-ichiro; Fomalont, Edward B.; Kaifu, N.

doi:10.1086/165062

Cited by 18 publications

(14 citation statements)

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“…Molecular line radiation has been detected in both nebulae. Kawabe et al (1987) have mapped the CO J = 1o emission from AFGL 2688 and found three structures: a central compact core elongated in the equatorial plane of the system and centered on the IR core, spurs of emission from the outer edge of the northern optical lobe, and blueshifted emission along the polar axis of the system. Structures perpendicular to the polar axis in the equatorial plane have also been detected in NH3t HC 7 N, andHCN (Nguyen-Q.-Rieu, Winnberg, andBujarrabal 1986, Bieging andNguyen-Q.-Rieu 1988).…”

Section: Ngc 2392 and Ngc 6543mentioning

confidence: 99%

“…The assymetry between the lobes may be in part due to the orientation of the source, where the N lobe is tipped toward the observer at an angle of less than 30 0 (Kawabe et al 1987). The spacing of the peak is different in the I, H, and K…”

mentioning

confidence: 99%

“…42. Model of AFGL 2688 fromKawabe et al (1987). Region A is the expanding disk in the equatorial plane of the system.…”

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confidence: 99%

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A New Mid-Infrared Camera for Ground-Based Astronomy and an Infrared Study of Planetary Nebulae

Hora¹

1992

PASP

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The dissertation is composed of two parts. The first part is a description of the Mid-Infrared Array Camera (MIRAC), a new camera for ground-based astronomy. The second part of the dissertation is an infrared study of planetary nebulae utilizing observations with the new camera.MIRAC is a collaborative effort between the University of Arizona, Smithsonian Astrophysical Observatory, and Naval Research Laboratory. It currently utilizes a Hughes 20x64 Si:As impurity-band-conduction (IBC) detector array with a capacitive transimpedance amplifier (CTIA) readout, which is sensitive to IR radiation from 2 to 26 ¡xm. The camera is equipped with 10% bandwidth filters at 2. 2, 3.8, 4.6, 8.8, 9.8, 11.7, and 12.5 /xm, and a wide-band 8.0-12.8 ¡xm (A-band) filter. There is also a 20% filter at 20.5 jum, and an 8-14 ¡xm CVF with a resolution of 1.8%. An adjustable slide with several pupil stops allows the camera to be configured for telescopes with focal ratios ranging from 15 to 45. Two externally selectable magnifications are provided by the fully reflective optics, giving plate scales of 0'.'35 and 0''7 pixel -1 on the NASA IRTF. The MIRAC electronics provides timing signals and coadds successive frames at a maximum rate of 10 kHz for the full array, and higher rates for a partial array readout. The data are transferred via a serial interface to a PC for real-time display, storage, and further processing. MIRAC recently achieved a NEFD of 0.010 Jy arcsec -2 at 8.8, 11.7, and 12.5 ¡xm for a 900-s on-source integration on the Steward Observatory 1.5-m telescope.Planetary nebulae (PNe) are formed from circumstellar material ejected during the late stages of stellar evolution. These nebulae are an important source of enrichment for the interstellar medium. In many PNe, there is an excess of emission in the IR, indicating the presence of dust. There are several different components seen in the IR emission, including a family of unidentified IR (UIR) emission features at 3.3, 6.2, 7.7, and 11.3 ¡xm. The source morphology provides information on the structure of the nebula as well as the carriers of the emission features. Images in the nearand/or mid-IR are presented for the following PNe: IC 418, BD + 30°3639, J900, NGC 2392, NGC 6543, AFGL 2688, and M 2-9. The mid-IR images were obtained using MIRAC, and the images at J, H, and K were obtained using the Steward Observatory 64x64 Hg:Cd:Te array camera. In BD + 30°3639, the UIR emission is seen to be spatially distinct from the IR continuum and the ionized gas as traced by the 12.8 ¡xm [Ne il] line emission. The average temperature across the nebula of the dust responsible for the mid-IR continuum emission is 172 K. In IC 418, the size of the nebula increases as a function of wavelength in the near-IR images at «/, H, and K. Emission from the halo is detected in the H and K images. In NGC 2392 and NGC 6543, evidence for excess emission is seen in the distribution of the near-IR flux. The distribution of IR emission differs significantly from the emission observed at optical wavele...

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Section: Ngc 2392 and Ngc 6543mentioning

confidence: 99%

mentioning

confidence: 99%

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A New Mid-Infrared Camera for Ground-Based Astronomy and an Infrared Study of Planetary Nebulae

Hora¹

1992

PASP

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“…This special interest is stimumated by the hope of finding a new approach to the problem of the origin and the galactic role of the planetary nebulae. The only thing we can do here is to enumerate some recent publications on the chemical compositions of many objects: Czyzak (1983a), French (1983), , Kholtygin (1984), , Kaler (1985b) and the reviews by Kaler (1983a) and . Some new papers contribute to the scarce data on the chemical compositions of the high-latitude galactic planetary nebulae (Barker, 1983b;Adams et aL, 1984;Barker and Cudworth, 1984) and of the planetary nebulae in the Magellanic Clouds (Aller, 1983b;Aller and Czyzak, 1983b;Barlow et al, 1983).…”

Section: Chemical Compositions Of Planetary Nebulaementioning

confidence: 99%

“…There are indications of mass leaving the compact nuclei of these objects with rates of 3 x 10 -5 _/14o yr-1 (Beckwith et aL, 1984). The linear dimensions of the objects are of the order of 1018 cm, and the expansion velocities reach approximately + 20 km s -a (Kawabe et aL, 1987).…”

Section: Voxmentioning

confidence: 99%