STUDIES OF EARLY-TYPE VARIABLE-STARS .6. A SPECTROSCOPIC STUDY OF V-599 AQUILAE

From a new spectroscopic orbit of the early-type binary system V 599 Aql, based on Reticon observations, we find: m(p) sin3i = 4.54 +/- 0.07 m . , m(s) sin3i = 3.06 +/- 0.04 m . , (a(p) + a(s)) sin i = 12.43 +/- 0.06 R . and m(p)/m(s) = 1.49 +/- 0.02. The velocity measures themselves are based on fitting a cross-correlation function derived from a spectrum taken at conjunction to the observed c.c.f's. Such a profile matched the various observed cross-correlation functions very well, much better in fact than either a Gaussian or Lorentzian function. A spectrophotometric analysis yields spectral types of B3V and B5V for each component and a luminosity ratio (primary/secondary) of 3.44 + 0.1. The system may be very young because only by assuming the components are zero-age main-sequence objects could we find a self-consistent solution to the spectrophotometry. We have analysed the system assuming masses consistent with ZAMS objects and synchronous rotation but this leads to radii and absolute magnitudes that are similar to main-sequence values. Alternatively, assuming ZAMS masses and radii we find that the stars are rotating approximately 50% above synchronism. Both analyses produce photometric elements that satisfy a rather noisy light curve. The system could be marginally eclipsing and would benefit from a new light curve. It is reddened, E(B - V) = 0.42, but a distance must await further light curve analysis.