Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-02-14
Astronomy and Astrophysics
Astrophysics
26 pages, 12 figures; AASTEX v5.0 plus EPSF extensions in mkfig.sty; to appear in ApJ
Scientific paper
10.1086/308838
We present results from an empirical study of the Mg II h & k emission lines of selected Mira variable stars, using spectra from the International Ultraviolet Explorer (IUE). The stars all exhibit similar Mg II behavior during the course of their pulsation cycles. The Mg II flux always peaks after optical maximum near pulsation phase 0.2-0.5, although the Mg II flux can vary greatly from one cycle to the next. The lines are highly blueshifted, with the magnitude of the blueshift decreasing with phase. The widths of the Mg II lines are also phase-dependent, decreasing from about 70 km/s to 40 km/s between phase 0.2 and 0.6. We also study other UV emission lines apparent in the IUE spectra, most of them Fe II lines. These lines are much narrower and not nearly as blueshifted as the Mg II lines. They exhibit the same phase-dependent flux behavior as Mg II, but they do not show similar velocity or width variations.
Karovska Margarita
Wood Brian E.
No associations
LandOfFree
Studying the Pulsation of Mira Variables in the Ultraviolet does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Studying the Pulsation of Mira Variables in the Ultraviolet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Studying the Pulsation of Mira Variables in the Ultraviolet will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-612715