Emission-line CCD imaging of three southern symbiotic stars |
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| Authors: | Harish C Bhatt Ram Sagar |
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| Institution: | (1) Indian Institute of Astrophysics, 560034 Bangalore |
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| Abstract: | Symbiotic stars that are strong radio sources and have cool dust emitting in the infrared are expected to have extended emission
nebulae around them. In order to search for such emission nebulae, we have carried out CCD imaging of three symbiotic stars
(R Aqr, RR Tel and H1-36) with narrow-band filters centred at the emission lines of O III] λ5007, Hα λ6563, N II] λ6584,
S II] λ6717 + 6731. RR Tel and H1-36 images do not show any extended nebulosities around them. The CCD image of the R Aqr
nebulosity in the high excitation O m] line is different from its image in Hα and the low excitation lines of N II] and
S II] indicating ionization-stratification in the nebula. In H1-36 the optical nebulosity (if it exists) is smaller than
∽2 arcsec while the radio image size is known to be large (∽5 arcsec). This behaviour is opposite to that seen in R Aqr in
which the radio emission comes from the core region of a much larger optical nebulosity. Interstellar and/or circumstellar
extinctions are suggested to be responsible for this difference |
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| Keywords: | narrow-band CCD imaging symbiotic star morphology |
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