The Behavior of HgMn Stars in the Far UV—Paper 23: HD 144844

Abstract

Abstract The analysis of four high resolution spectra of the Mn P Ga star HD 144844 recorded by the SWP camera on board the International Ultraviolet Explorer does not reveal variations of the far ultraviolet flux of this star from 1994 July 1st to July 12th. The IUE spectra sample four different rotational phases of the rotational period derived recently from the Kepler lightcurve which shows that the far ultraviolet flux of HD 144844 is not modulated by rotation. However a previous low resolution SWP spectrum taken in August 1989 has significantly more FUV flux shortwards of 1700 Å than the spectra collected in 1994 July. On the the first spectrum of the 1994 July observations, the Al ii resonance line at 1670.79 Å is split into two components probably reflecting the orbital motions of HD 144844 and its companion.