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Rapid Variations of Discrete Absorption Components in the spectrum of P Cygni

Published online by Cambridge University Press:  12 April 2016

G.L. Israelian
G.L. Israelian*
Affiliation:
Insituto de Astrofisica de Canarias, Canary Islands, Tenerife, Spain

Abstract

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The morphology and variability of spectral lines in the P Cygni high-resolution and high signal-to-noise near-UV spectra have been studied in detail over a period of few days. It is found that several Balmer lines have profiles with a complicated structure. All those lines which are well developed, but still not saturated, show two absorption components. A striking profile variability is discovered on a time-scale of from 1 to 3 days. The most dominant part of rapid variations is the drift of absorption components. It appears that there are two different kinds of components: long lived (with a characteristic time-scale of 200 days) and short-lived (time-scale of few days). The DAC phenomenon in the P Cygni stellar wind is a problems that still remains unsolved.

Type
1. Overview
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 96 - 99
Copyright
Copyright © Astronomical Society of the Pacific 2000

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