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Variations of the high-level Balmer line spectrum of the helium-strong star Sigma Orionis E
Myron A. Smith, David A Bohlender
Using the high-level Balmer lines and continuum, we trace the density structure of two magnetospheric disk segments of the prototypical Bp star sigma Ori E (B2p) as these segments…
Variations of the ultraviolet resonance lines of the Be IV-V star zeta Cassiopeiae
Myron A. Smith, David A. Bohlender
Recently Neiner et al. reported that the B2 IV-V star zeta Cas contains a weak magnetic field which varies on the same 5.37 day period found from the modulations of its N V, C IV,…
On the X-ray and optical properties of the Be star HD 110432: a very hard-thermal X-ray emitter
Raimundo Lopes de Oliveira, Christian Motch, Myron A. Smith +3
(ABRIDGED) - HD 110432 is the first proposed, and best studied, member of a growing group of Be stars with X-ray properties similar to gamma Cas. These stars exhibit hard-thermal X…
Variations of the HeII 1640A Line in B0e--B2.5e Stars
Myron A. Smith
Using the IUE data archive, we have examined the SWP-camera echellograms of 74 B0--B2.5e stars for statistically significant fluctuations in the He II ("Halpha") 1640A line profile…
Rotational and Cyclical Variability in gamma Cassiopeia
M. A. Smith, G. W. Henry, E. Vishniac
We report results of a nine-year monitoring effort on the unusual classical Be with a robotic ground-based (APT) B,V-filtered telescope as well as simultaneous observations in 2004…
The Remarkable Be Star HD110432
Myron A. Smith, Luis Balona
HD110432 has gained considerable attention because it is a hard, variable X-ray source similar to gamma Cas. From time-serial echelle data obtained over two weeks during 2005 Janua…