J/A+A/343/841 J/A+A/343/841 Imaging of symbiotic stars R L M Corradi E Brandi O E Ferrer H E Schwarz Astron. Astrophys. 343 841 1999 1999A&A...343..841C III/174 : Atlas of line profiles of symbiotic stars (VanWinckel+, 1994) Spectrophotometry Stars, variable binaries: symbiotic ISM: jets and outflows surveys Narrowband images of 51 symbiotic stars were obtained at the ESO and ORM observatories to search for resolved optical nebulae. Ionized nebulae much larger than previously known are found around CH Cyg, HM Sge and V1016 Cyg, and they will be discussed in detail in forthcoming papers. A nebula with a deconvolved size between 0.9" and 1.5" is found around the symbiotic Mira H 1-36. The radio sources located few arcminutes aside of R Aqr (Hollis et al., 1987ApJ...321L..55H), which were suggested to be the remnant of a prehistoric eruption of the system, are found to be background galaxies. We also present a bibliographical compilation, updated to October 1998, of all the extended nebulae around symbiotic stars detected at optical and radio wavelengths, as well as a list of optical non-detections. The statistics of occurrence of these large ionized nebulae among symbiotic stars is discussed. Extended ionized nebulae appear to be a common component of the D-type symbiotics, and we infer that they are formed by the Mira wind and/or high velocity winds ejected by the hot component during outbursts. On the contrary, very few nebulae are detected around the systems containing normal red giants.

Name1 First name of the object --- Name2 Second name (only when existing) --- IRType Symbiotic IR type --- Tel Telescope number=1 2.6NOT: 2.6m Nordic Optical Telescope of the ORM 1.5DAN: 1.54m Danish telescope of ESO 3.5NTT: 3.5m NTT of ESO 0.9DUT: 0.9m Dutch telescope of ESO 1SAAO : 1m telescope at the South African Astronomical Observatory --- Filter Filter number=2 Ha+[NII]: relatively broad filter (FWHM>=5nm) including both H{alpha} and [NII] emission Ha or [NII]: narrow filter isolating one of the two lines, with no or little contamination from the other (FWHM=2.5nm at the 1.5DAN, 1nm at the 2.6NOT) [OIII]: [OIII]500.7nm [OII]: [OII]372.8nm Ha cont.: off-band filter (continuum) --- ExpTime Exposure time number=3 (C) = coronographic spot s See Seeing arcsec Notes Notes number=4 saturated: indicated only when all exposures in a specific filter produced saturated images of the central source. 1: Munari & Patat, 1993A&A...277..195M 2: Kohoutek, 1997A&AS..125..445K 3: Extended nebula detected by Paresce (1990ApJ...357..231P), using a coronograph and after substraction of a stellar profile 4: A sub-arcsec nebula was detected by HST (Schild & Schmid, 1997A&A...324..606S) 5: An H{alpha} nebula with a size of 8 arcsec was detected by Fuensalida et al. (1988A&A...191L..13F) 6: No field stars available for comparison --- Patricia Bauer CDS 1999Jan05Romano Corradi <rcorradi@ll.iac.es> J_A+A_343_841.xml