Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21443103b&link_type=abstract
American Astronomical Society, AAS Meeting #214, #431.03; Bulletin of the American Astronomical Society, Vol. 41, p.702
Astronomy and Astrophysics
Astronomy
Scientific paper
We present ultraviolet spectra of the Mira AB binary system taken by IUE from 1979 to 1995. In this study, we concentrated on the Mg II k & h emission lines arising primarily from Mira B. The broad Mg II profiles from Mira B are enhanced on the red side of the profile and obscured on the blue side due to the wind of Mira B. Small-scale variations in the flux of these lines are seen in the spectra. At some phases the absorption and emission components appear in the blue side of the k & h lines and disappear at other phases. These components are not mentioned in previous studies. The absorption component originates from the circumstellar envelope, while the emission features likely arise from both Mira A and the accretion disk around Mira B. Overlying wind absorption is present on the red side of the Mg II lines, extending out to -450 km s-1. There is a relation between the parameters of these lines (line flux, line width, line velocity) and phase, which we attribute to time variations in the density of matter around Mira B. Mg II emission in single Mira variables often displays a stronger h line than k line, opposite to the values of their oscillator strengths. Meanwhile, non-Mira red giants typically show the k line being stronger than the h line in accordance with their respective oscillator strengths. The Mg II k-to-h emission ratio from Mira B more closely follows the relative strength of k and h as seen in the non-Mira red giants than for single Mira-type red giants.
M.B. acknowledges support from NASA, through grant number HST-AR-10304.01-A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.
Abo-Elazm Mohamed S.
Bobrowsky Matthew
Hamdy Mounir A.
Sanad M. R.
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