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Evidence for symbiotic nature of 2MASS J21012803+4555377
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Just less than 300 symbiotic stars are currently known in the Galaxy. The population synthesis methods predict that this amount should be 10--100 times larger. In recent years, several works have attempted to find symbiotic candidates from photometric surveys. Regular spectroscopic observations of these candidates can increase the number of known symbiotic systems. We aim to verify the symbiotic nature of 2MASS J21012803+4555377. Archive photometry and low-resolution spectra (R=1500-2000) of the candidate are presented. Besides molecular bands, the spectrum displays numerous emission lines including forbidden and high-ionization ones -- He II, [Fe VII], etc. A strong Raman-scattered O VI line is observed at 6825A. The source shows prominent excessive emission in the infrared related to a dense circumstellar dust shell. All this evidence indicates that 2MASS J21012803+4555377 should be classified as a D-type symbiotic star.
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New symbiotic stars or candidates in LAMOST low resolution spectra
A Gaia-based HRD preselection plus LAMOST emission-line diagnostics yields five new symbiotic stars and twenty-six new symbiotic star candidates.
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