FS CMa type stars is a group of ~70 objects formerly known as unclassified stars with the B[e] phenomenon. Their very strong emission-line spectra in combination with a nearly main-sequence luminosity suggest the binary nature for them. They possess strong IR excesses due to radiation of circumstellar dust that implies a compact distribution probably in a circumbinary disk. Our long-term spectroscopic monitoring revealed neutral metal lines, which always include that of Li I 6708 \AA, in the spectra of some FS CMa objects indicating the presence of a cool star. We present a summary of our results with a first overview of FS CMa type binaries and review possible implications for the nature and evolutionary status of the entire group.
Cite
@article{arxiv.1508.06298,
title = {FS CMa type binaries},
author = {Anatoly Miroshnichenko and Sergey Zharikov},
journal= {arXiv preprint arXiv:1508.06298},
year = {2015}
}
Comments
4 pages, 1 figure, to appear in EAS Publication Series, in proceedings of the "Physics Of Evolved Star 2015" conference