J/A+A/480/409       IPHAS symbiotic stars candidates            (Corradi+, 2008)
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Beginning of ReadMe : J/A+A/480/409 IPHAS symbiotic stars candidates (Corradi+, 2008) ================================================================================ IPHAS and the symbiotic stars. I. Selection method and first discoveries. Corradi R.L.M., Rodriguez-Flores E.R., Mampaso A., Greimel R., Viironen K., Drew J.E., Lennon D.J., Mikolajewska J., Sabin L., Sokoloski J.L. <Astron. Astrophys., 480, 397-407 (2008)> =2008A&A...480..409C ================================================================================ ADC_Keywords: Surveys ; Binaries, cataclysmic ; Photometry, infrared Keywords: surveys - Galaxy: stellar content - stars: binaries: symbiotic - stars: emission-line, Be - stars: pre-main sequence - ISM: planetary nebulae: general Abstract: The study of symbiotic stars is essential to understand important aspects of stellar evolution in interacting binaries. Their observed population in the Galaxy is however poorly known, and is one to three orders of magnitudes smaller than the predicted population size. IPHAS, the Isaac Newton Telescope Photometric Halpha survey of the Northern Galactic plane, gives us the opportunity to make a systematic, complete search for symbiotic stars in a magnitude-limited volume, and discover a significant number of new systems. A method of selecting candidate symbiotic stars by combining IPHAS and near-IR (2MASS) colours is presented. It allows us to distinguish symbiotic binaries from normal stars and most of the other types of Halpha emission line stars in the Galaxy. The only exception are T Tauri stars, which can however be recognized because of their concentration in star forming regions. Description: As the present study was progressing, we started a campaign of spectroscopic follow-up of the Halpha emitters detected by IPHAS. Accordingly a dozen candidate symbiotic stars, selected as described in the next sections, were observed at the INT using the IDS spectrograph, on nights of May 11, June 14, and September 9, 2006.

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