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2023RNAAS...7..139M - Research Notes of the AAS, 7, 139 (2023/July-0)
The Behavior of Bp He-weak Stars in the Far UV-Paper IX: HD 142990.
MONIER R.
Abstract (from CDS):
The analysis of eighteen spectra of the B6 He-weak star HD 142990 recorded by the SWP camera on board the International Ultraviolet Explorer reveals variations of the far-ultraviolet spectral energy distribution shortwards of 1700 Å over about 6 hr, ie. about 25% of the rotational period. Several Si II, Si III and Si IV vary consistently. Silicon must be distributed in a non uniform manner over the surface of HD 142990 so as to modulate the FUV flux over the rotational period. The low resolution spectra also confirm this variability.
Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.
Journal keyword(s): Chemically peculiar stars - Helium-weak stars
Simbad objects: 1
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