IPHAS and the symbiotic stars. II. New discoveries and a sample of the most common mimics - Astrophysics > Astrophysics of GalaxiesReport as inadecuate




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Abstract: In a previous paper arXiv:0712.2391, we presented the selection criterianeeded to search for symbiotic stars in IPHAS, the INT Halpha survey of theNorthern Galactic plane. IPHAS gives us the opportunity to make a systematic,complete search for symbiotic stars in a magnitude-limited volume. Follow-upspectroscopy at different telescopes worldwide of a sample of sixty twosymbiotic star candidates is presented. Seven out of nineteen S-type candidatesobserved spectroscopically are confirmed to be genuine symbiotic stars. Thespectral type of their red giant components, as well as reddening and distance,were computed by modelling the spectra. Only one new D-type symbiotic system,out of forty-three candidates observed, was found. This was as expected seediscussion in our paper on the selection criteria. The object shows evidencefor a high density outflow expanding at a speed larger than 65 km-s. Most ofthe other candidates are lightly reddened classical T Tauri stars and morehighly reddened young stellar objects that may be either more massive youngstars of HAeBe type or classical Be stars. In addition, a few notable objectshave been found, such as three new Wolf-Rayet stars and two relativelyhigh-luminosity evolved massive stars. We also found a helium-rich source,possibly a dense ejecta hiding a WR star, which is surrounded by a largeionized nebula.



Author: R.L.M. Corradi, M. Valentini, U. Munari, J.E. Drew, E.R. Rodríguez-Flores, K. Viironen, R. Greimel, M. Santander-García, L. Sab

Source: https://arxiv.org/







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