Other
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1598e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, May 1990, p. 1598-1611. Research supported by NSERC.
Other
23
Cepheid Variables, Companion Stars, Stellar Orbits, Iue, Speckle Interferometry, Stellar Evolution, Stellar Luminosity, Stellar Mass, Supergiant Stars
Scientific paper
New radial velocities of the classical Cepheid FF Aql have been obtained and combined with previous observations to provide a revised orbit. A companion has been detected at 1800 A in IUE spectra with a spectral type of A9 V to F3 V. If the Cepheid has an evolutionary mass, then the mass ratio is M1/M2 = 3.8. A companion recently detected by speckle interferometry is in a longer-period orbit if it is a physical companion. In this case it is also an evolved star. The possible fourth member of the system, the visual companion, is unlikely to be a member of the system. The companion at 6 arcsec is unlikely to be a physical companion. Cepheids (in the 'free-fall' descending branch of the light curve) and nonvariable supergiants are shown to have a different spectral slope between 2900 and 1800 A for the same (B-V)0. IUE spectra of Polaris are rediscussed using other Cepheid spectra as comparison stars, and it is concluded that there is probably no sign of a companion.
Remage Evans Nancy
Scarfe Colin D.
Teays Terry J.
Welch Douglas L.
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