Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997balta...6..395p&link_type=abstract
Baltic Astronomy, vol. 6, p. 395
Astronomy and Astrophysics
Astronomy
1
Stellar Spectrophotometry, Binary Stars, Stellar Spectra, Spectrograms, Line Spectra, Balmer Series, Iron, Hydrogen
Scientific paper
The interacting binary star AX Mon (K0III + B3 V) has been observed at the Tartu Observatory, Estonia, from 1985 to 1997 using the 1.5-m telescope. Seventy-five spectrograms are analyzed in the present paper. The hydrogen Balmer lines, H-alpha and H-beta, and, occasionally H-gamma and H-delta exhibit P Cygni-like profiles. Variations in the intensities, equivalent widths, radial velocities, and full widths at half maximum of the emission and absorption components of the Balmer lines on timescales from days to about 10-12 yr have been found. The variations are caused mostly by variability in the extent and physical characteristics of the B star envelope. Weak orbital variations (P = 232.5 d) of H-beta and H-gamma show that these lines form closer to the B star than H-alpha. Emission lines of Fe II probably arise in the envelope of the hot star as well as in the stream of matter between the K giant and the B star.
Leedjarv Laurits
Puss Alar
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