Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238..675e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, May 15, 1989, p. 675-688.
Astronomy and Astrophysics
Astronomy
11
Binary Stars, H Alpha Line, Light Curve, Line Spectra, Signal To Noise Ratios, Astronomical Photometry, High Resolution, Iue, Orbital Elements
Scientific paper
HR 7275 is a bright, long-period (28 day), single-lined RS CVn binary. High-resolution (0.36 A) and good signal-to-noise ratio echelle spectra do not show any clear evidence of the secondary in the system on spectral lines. Also, absence of a continuum on a low-resolution UV spectrum (IUE merged log) and the known mass function imply a main-sequence secondary with a spectral type late F to middle G, corresponding to the mass range of M2 of between 0.9 and 1.1 solar masses. The present spectra show variable H-alpha from the primary (K 1 III-IV). At least 30 percent excess emission with respect to Arcturus and about 7 percent modulation of the central intensity in the term of continuum at H-alpha has been measured. The maximum emission occurred during light minimum on the light curve of the same cycle of present observations.
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