Abstract
Stars having remarkable emission lines in the optical spectra are called emission-line stars and widely distributed on the Hertzsprung-Russell (HR) diagram including various stellar types:
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(1)
Early type stars—Wolf-Rayet (WR) stars, Of, Oe/Be/Ae stars, Luminous Blue Variables (LBV).
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(2)
Late type stars—dMe stars, flare stars, red giants, Mira variables.
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(3)
Close binaries—Algol stars, cataclysmic variables (CV), symbiotic stars.
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(4)
Pre-main sequence stars—Herbig Be/Ae stars, T Tauri stars.
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Further reading
Hearnshaw, J. B. (1986). The Analysis of Starlight, One Hundred and Fifty Years of Astronomical Spectroscopy. Cambridge University Press, Cambridge.
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Tassoul, J.-L. and Tassoul, M. (2004). A Concise History of Solar and Stellar Physics. Princeton University Press, Princeton, NJ.
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Kogure, T., Leung, KC. (2007). Introduction. In: The Astrophysics of Emission-Line Stars. Astrophysics and Space Science Library, vol 342. Springer, New York, NY. https://doi.org/10.1007/978-0-387-68995-1_1
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