Observations of the O'Connell effect system VY Crucis

Details Observations of the O'Connell effect system VY Crucis Observations of the O'Connell effect system VY Crucis

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apjs...56..295m&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 56, Nov. 1984, p. 295-301. Research supported by the Natural Scie

Astronomy and Astrophysics

Astrophysics

2

Eclipsing Binary Stars, Light Curve, Stellar Spectrophotometry, Ubv Spectra, Fourier Analysis, Telescopes

Scientific paper

UBV observations of the 0.696-day period binary VY Cru were made from CTIO, ESO, and UTLCO in 1977. The B and V light curves bear strong resemblance to the photographic light curve of Bruna, which is the only previously published light curve. The system has a sizable O'Connell (1951) effect (+0.11 mag in V and +0.14 mag in B), with the brighter maximum being slightly bluer, and a large difference between the minima (+0.10 mag in V and +0.13 mag in B). Fourier analysis of the light curve shows that the sine term has changed significantly. Despite the large O'Connell effect, the properties of the system appear more characteristic of the A-type W UMa systems. The spectral type of the system is about A8. The spectrum appears single-lined at the nominal 60 A/mm dispersion of the image-tube plates.

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