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9 - Spectroscopy of peculiar stars

Published online by Cambridge University Press:  05 April 2014

John B. Hearnshaw
John B. Hearnshaw
Affiliation:
University of Canterbury, Christchurch, New Zealand
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Summary

Introduction to peculiar stars

The study of peculiar stellar spectra has always played an important role in stellar spectroscopy, ever since emissionline stars such as γ Cas, T CrB and the Wolf–Rayet stars were first recognized during the 1860s as being unusual (see Chapter 4).

Thirteen types of peculiar star are discussed in this chapter. In general, the peculiarities are either the presence of emission lines in the spectra, or the presence of absorption lines of abnormal strength or profile. These peculiarities often aggravate attempts to classify stellar spectra in a two-dimensional scheme such as the MK system, described in the previous chapter. This is especially so if the peculiarities are due to photospheric abundance abnormalities which result in either unusually strong or weak absorption lines.

The list of types of star having peculiar spectra is certainly not exhaustive; emphasis is given to discussing those in which the spectral peculiarities predominate or were the first observed. Other peculiarities, such as intrinsic light variability or those arising from the star being a binary, may also be present in many of these types. However a full discussion of the peculiarities in the spectra of all known types of variable or binary star is omitted for want of space.

Carlyle Beals and the Wolf – Rayet classification

By 1928 the problem of how to classify the absorption-line spectra of O stars had been essentially settled by the IAU Commission 29.

Type
Chapter
Information
The Analysis of Starlight
Two Centuries of Astronomical Spectroscopy
 , pp. 193 - 252
Publisher: Cambridge University Press
Print publication year: 2014

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