The Gamma DOR variable HD 164615 - Results from a multisite photometric campaign

Details The Gamma DOR variable HD 164615 - Results from a multisite photometric campaign The Gamma DOR variable HD 164615 - Results from a multisite photometric campaign

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292...43z&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 43

Other

29

F Stars, Variable Stars, Astronomical Photometry, Stellar Spectra, Stellar Rotation

Scientific paper

We present the results from a multisite photometric campaign devoted to the Gamma Dor variable HD 164615. During the campaign, data were collected in the Johnson and Stromgren photometric systems. A first search for sinusoidal periodicities yielded a three-term solution with frequencies f1 = 1.2328, f2 = 1.0899, and f3 = 2.3501/d, and a long-term trend f4 = 0.1301/d. The star may therefore be multiperiodic with each frequency related to a pulsation mode. However, a further examination of the curve provided evidence that the amplitude at the instant of maximum brightness is modulated. Alternatively, HD 164615 may be a monoperiodic variable with frequency f1 = 1.2321/d, showing amplitude modulation with frequency f4 = 0.1301/d. The presence in the power spectra of the coupling terms f2 = f1 - f4 and f3 = f1 + f4 - 1 supports the latter interpretation. In the monoperiodic case the previously given interpretation based on a spot carried through the visible disk by rotation still holds, provided that the spot is bright and evolves on a time scale of a few days. However, similarities with other Gamma Dor stars provide indirect indication in favor of the existence of a nonradial pulsation interpretation.

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