FS CMa type binaries

Abstract

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 Å, 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.

4 pages, 1 figure, to appear in EAS Publication Series, in proceedings of the "Physics Of Evolved Star 2015" conference

References in corpus (2)

• Spin-up and hot spots can drive mass out of a binary
• First detections of FS Canis Majoris stars in clusters. Evolutionary state as constrained by coeval massive stars

Cited by in corpus (4)

• Catalogue of new Herbig Ae/Be and classical Be stars. A machine learning approach to Gaia DR2
• Time-dependent spectral-feature variations of stars displaying the B[e] phenomenon III. HD 50138
• First detection of a magnetic field in low-luminosity B[e] stars: New scenarios for the nature and evolutionary stages of FS CMa stars
• Intermediate-Mass Mergers: A New Scenario for Several FS CMa Stars