The Magnesium b Lines in Late-Type Stars
Open Access
- 1 July 1960
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 121 (1) , 52-75
- https://doi.org/10.1093/mnras/121.1.52
Abstract
The absorption lines of Mg I at λ 5167–84A have been measured photoelectrically in 539 G0–K5 stars. The results show an increasing absorption with advancing spectral type and a negative absolute luminosity effect. No significant differences are found between the strong and weak line groups of Miss Roman, or between weak-CN and strong-CN stars. High velocity class III stars have slightly stronger Mg than normal. It is suggested that the Mg b lines can be used as a good criterion of the MK luminosity class for stars with B−V between 0.70 and 1.30, and as a fairly good criterion of MK spectral type between G8 and K5.Keywords
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