Spectral classification of the cool components of symbiotic stars |
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| Affiliation: | 1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 China;2. Institut d''Astrophysique, 98 bis Boulevard Arago, 75014 Paris, France;1. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China;2. College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, Guangdong, China;1. “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania;2. Center of Materials Technology and Laser, School of Electrical Engineering, Technological Educational Institute of Crete, Heraklion, Greece;3. National Institute for Research and Development in Microtechnologies (IMT-Bucharest), 126 A, Erou Iancu Nicolae Street, P.O. Box 38-160, 023573 Bucharest, Romania;1. Universidad Nacional de Colombia, Facultad de Ciencias, Medellín, Colombia;2. Universidad Nacional de Colombia, Facultad de Ciencias Agrarias, Medellín, Colombia;3. Universidad de Sucre, Facultad de Ingeniería, Sincelejo, Colombia;1. Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India;2. TCS Research, Tata Research Development and Design Centre, A Division of Tata Consultancy Services, 54-B, Hadapsar Industrial Estate, Pune, 411013, India |
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| Abstract: | We have made near infrared spectroscopic observations of 10 symbiotic and 27 K-M comparison stars. For stars later than M3, we found the band depth of the triple-headed TiO absorption band to be sensitive to temperature and insensitive to gravity. We fitted the spectral type to the band depth with a standard error of 0.22 of a subtype and derived the spectral types for 6 symbiotic stars. We measured the EW of a large number of lines including the CaII lines (very sensitive to luminosity), the FeI and TiO lines (moderately sensitive) and the NaI lines (not sensitive). The EW of these lines vary with the spectral type, particularly for stars later than M3, both spectral type and luminosity effects must be considered. We give the luminosity classes for 10 of the brighter symbiotic stars, they are all giant stars, showing no features of bright giants or supergiants. |
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