Reexamining the beat Cepheid TU CAS - No second overtone, no mode switching

Details Reexamining the beat Cepheid TU CAS - No second overtone, no mode switching Reexamining the beat Cepheid TU CAS - No second overtone, no mode switching

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..748m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 2, Aug. 1992, p. 748-757. Research supported by NSF and NSERC.

Astronomy and Astrophysics

Astronomy

5

Astronomical Photometry, Cepheid Variables, Least Squares Method, Radial Velocity, Stellar Rotation

Scientific paper

Simultaneous photometry and radial-velocity measurements of the double-mode Cepheid TU Cas were obtained in 1987, to check on the mode behavior of this star after a decade-long gap in the observing record. Least-squares fits of these data are performed to isolate the primary (2.14 d) and secondary (1.52 d) variations. The residuals of the present solution rule out the existence of any tertiary mode with V and velocity amplitudes greater than 0.004 mag and 0.7 km/s, respectively, contradicting Faulkner's (1977) report of such a mode with amplitude 0.05 mag. Nor is a significant change detected in the relative amplitudes of the modes compared to previous data, cited as evidence for mode switching in this star by earlier investigators.

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