Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241l.161v&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 241, Nov. 1, 1980, p. L161-L164. Research supported by the Nederland
Astronomy and Astrophysics
Astrophysics
41
Companion Stars, Optical Emission Spectroscopy, Stellar Spectrophotometry, X Ray Sources, X Ray Stars, Centaurus Constellation, Main Sequence Stars, Red Shift
Scientific paper
The optical spectrum of the transient X-ray burst source Centaurus X-4 was observed about 5 weeks after the source reached its maximum. The brightness of the optical counterpart had decreased to V = 18.2, and the star had become appreciably redder (B - V = 0.7) compared to its color at maximum. The spectrum of Centaurus X-4 is similar to that of cataclysmic variables showing strong emission lines of H-1 and weaker lines of He-1 and He-2. The N03 lambda 4640 line is not visible. The continuum energy distribution of Centaurus X-4 shows the presence of a main-sequence star in the system, with spectral type between K3 and K7. This is consistent with the orbital period of 8.2 hr proposed by Kaluzienski et al (1980), if the main-sequence star is close to filling its Roche lobe.
Paradijs Jan van
Pedersen Holger
van der Linden T.
Verbunt Frank
Wamsteker Willelm
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