The orbit and companion of the Cepheid S SGE - A probable triple system

Details The orbit and companion of the Cepheid S SGE - A probable triple system The orbit and companion of the Cepheid S SGE - A probable triple system

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1599e&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1599-1607.

Astronomy and Astrophysics

Astronomy

7

Celestial Mechanics, Cepheid Variables, Companion Stars, Radial Velocity, Stellar Motions, Stellar Magnitude, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra

Scientific paper

New radial velocities for the classical Cepheid S Sge have been obtained and combined with previous observations to derive a new orbit. The revised orbital elements are: gamma, -10.3 +/- 0.4 km/s; K, 15.5 +/- 0.2 km/s; e, 0.23 +/- 0.02; omega, 203.1 +/- 4.2 deg; T0, 39902.3 +/- 6.6 JD; P, 675.79 +/- 0.18 days; f(m), 0.239 +/- 0.010 solar masses; a sin i, 0.935 AU = 139.9 +/- 2.0 x 10 exp 6 km; s.e., 1.2 km/s. The revised elements differ very little from the orbit determined by Herbig and Moore (1952). We have also obtained low resolution IUE spectra to search for the companion. The IUE spectra show excess flux at 1800 A when compared with spectra of the single Cepheid Delta Cep at the same (B-V)0. The spectral type of the companion determined from this flux excess is A7 V to F0 V. However, the mass of such a companion (1.7 to 1.5 solar masses) is smaller than the minimum mass (2.8 solar masses) required by the mass function and an evolutionary mass of the Cepheid. We infer that the companion is itself a short period binary.

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