Abstract
We performed the slitless spectroscopic survey to identify classical Be (CBe) stars in open clusters older than 100 Myr. Observing a sample of 71 open clusters, we identified 13 CBe stars in 11 open clusters, one of, which (TYC 2679-432-1) is a new detection. The 13 CBe stars show both H\(\alpha \) in emission and IR excess, which confirm that they possess gaseous circumstellar discs. Two more CBe stars are found to exhibit H\(\alpha \) in absorption for the first time, indicating that might be passing through disc-less episode presently. The spectral-type estimation is done for all these 15 stars and it is noticed that they belong to B0.5–B8 type. Moreover, we found that the distribution of our sample is peaking near late B-types as expected.
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Acknowledgements
This research has made use of the WEBDA data base, maintained by the Institute for Astronomy of the University of Vienna. Also JHK data from the 2MASS catalog, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Centre/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. The following databases are also used: (1) SIMBAD data base, operated at CDS, Strasbourg, France. (2) VOSA, developed under the Spanish Virtual Observatory project supported from the Spanish MINECO through grant AyA2017-84089. (3) VizieR is a joint effort of CDS (Centre de Données astronomiques de Strasbourg) and ESA-ESRIN (Information Systems Division). Special thanks to Mrs Akshaya Subbanna, PhD scholar and Dr Sreeja S. Kartha, Assistant Professor, Department of Physics & Electronics, CHRIST (Deemed to be University) for all technical discussions.
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Jagadeesh, M.K., Mathew, B., Paul, K.T. et al. Study of classical Be stars in open clusters older than 100 Myr. J Astrophys Astron 42, 109 (2021). https://doi.org/10.1007/s12036-021-09780-w
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DOI: https://doi.org/10.1007/s12036-021-09780-w