Observations of the inner core of the Southern Crab

Details Observations of the inner core of the Southern Crab Observations of the inner core of the Southern Crab

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..199b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 1, Sept. 1991, p. 199-204.

Astronomy and Astrophysics

Astrophysics

7

Crab Nebula, Emission Spectra, Line Spectra, Planetary Nebulae, Stellar Envelopes, Symbiotic Stars, Astronomical Catalogs, Charge Coupled Devices, Hot Stars, Mira Variables

Scientific paper

Observations of He 2-104 (the Southern Crab) are carried out with the STScI coronograph and the RANICON photon-counting detector through B and (O-III) 5007 A filters. No evidence of the outer legs can be found in the continuum, confirming the emission-line nature of this outer structure. The 0.8 arcsec (FWHM) seeing and the coronograph allow us to resolve the bright inner nebula into a second, smaller crablike pattern showing the same general NE-SW orientation and point of origin of the legs. The core seems to form two complete oval loops. The similarity of this double nebula with the outer structure of R Aquarii is striking and reinforces the model of He 2-104 composed of an already detected 400 day Mira variable and an invisible hot evolved star. Multiwavelength comparisons also show that He 2-104 could be similar to the D-type symbiotic novae HM Sge and V 1016 Cyg.

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