SIMBAD references

2019PASP..131d4201S - Publ. Astron. Soc. Pac., 131, part no 4, 4201-44201 (2019/April-0)

Ultraviolet activity as indicators of small-scale magnetic fields in γ Cassiopeiae.

SMITH M.A.

Abstract (from CDS):

The recorded activity of γ Cas (B0.5 IVe) in the ultraviolet is important to an understanding of the mechanism behind this prototypical Be star's high-energy activity, especially its hard X-ray emissions. The analysis here focuses first on the phasing of ultraviolet and optical light curves from different epochs. The rotational interpretation of the 1.22 d optical signal is justified in part on this phasing. Next, observations of "migrating subfeatures" are detailed, which traverse blue to red across line profiles in high-quality spectra. These are likely to be proxies for surface magnetic fields, which have not been detected yet by spectropolarimetric means in rapidly rotating Be stars like γ Cas. Also, the important responses of the semi-forbidden resonance S IV line at λ1404.8 to simultaneous X-ray variations are analyzed. These results offer indirect support for the existence of small-scale magnetic fields on this Be star.

Abstract Copyright: © 2019. The Astronomical Society of the Pacific. All rights reserved.

Journal keyword(s):

Simbad objects: 5

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2019PASP..131d4201S and select 'bookmark this link' or equivalent in the popup menu


2020.02.28-05:12:19

© Université de Strasbourg/CNRS

    • Contact