Keywords
stars: early-type
stars: individual ($\lambda$ Cep)
stars: oscillations
stars: variables: general
Astrophysics - Solar and Stellar Astrophysics
stars: individual ($\lambda$ Cep)
stars: oscillations
stars: variables: general
Astrophysics - Solar and Stellar Astrophysics
How to Cite
Epoch-dependent absorption line profile variability in lambda Cep. (2014). Revista Mexicana De Astronomía Y Astrofísica, 50(1), 67-76. https://astronomia.unam.mx/journals/rmxaa/article/view/2014rmxaa..50...67u
Abstract
We present the analysis of a multi-epoch spectroscopic monitoring campaign of the O6 Ief star lambda Cep. Previous observations reported the existence of two modes of non-radial pulsations in this star. Our data reveal a much more complex situation. The frequency content of the power spectrum considerably changes from one epoch to the other. We find no stable frequency that can unambiguously be attributed to pulsations. The epoch-dependence of the frequencies and variability patterns are similar to what is seen in the wind emission lines of this and other Oef stars, suggesting that both phenomena likely have the same, currently still unknown, origin.Similar Articles
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