The spectroscopic binary nature of the Cepheid Z Lacertae

Details The spectroscopic binary nature of the Cepheid Z Lacertae The spectroscopic binary nature of the Cepheid Z Lacertae

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pasp..101..160g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, Feb. 1989, p. 160-165. Research supported by the U

Astronomy and Astrophysics

Astronomy

8

Astronomical Photometry, Binary Stars, Cepheid Variables, Stellar Spectra, Radial Velocity, Stellar Mass

Scientific paper

New radial-velocity measures of high precision are used to demonstrate the spectroscopic binary nature of the 10.9-day Cepheid Z Lac. New photometric observations are presented and used to establish the correct phase relation of the new velocity measures to earlier radial-velocity observations of the Cepheid. The data now available are not sufficient to establish the orbital parameters of the Z Lac system, but there is evidence that the orbital period is several decades and possibly in excess of 100 years.

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