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Period Variation of the Cepheid Zeta Geminorum

1974; IOP Publishing; Volume: 188; Linguagem: Inglês

10.1086/181436

1538-4357

Helmut A. Abt, S. G. Levy,

Astronomy and Astrophysical Research

view Abstract Citations (14) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Period Variation of the Cepheid Zeta Geminorum Abt, Helmut A. ; Levy, Saul G. Abstract In anticipation of the coming lunar occultations of Gem on 1974 March 4 and 31, we derive a new ephemeris based on 70 years of radial-velocity measurements. The phases at the two occultations are predicted to be 0.96 and 0.65 phases, respectively, after light maximum. The period decreases at a steady rate of per year, which is 4 times the evolutionary rate for a 7 9) Cepheid in the fundamental mode. However, it is also possible that the period decrease is due to a light-time effect in a long-period (>225 years) binary having a low-mass secondary. Subject headings: Cepheids and W Virginis stars - lunar occultation - stars, individual - stellar evolution Publication: The Astrophysical Journal Pub Date: March 1974 DOI: 10.1086/181436 Bibcode: 1974ApJ...188L..75A full text sources ADS | data products SIMBAD (1)