The gamma DOR variable HD 164615: results from a multisite photometric campaign

DOI: 
10.1093/mnras/292.1.43
Publication date: 
01/11/1997
Main author: 
Zerbi, F. M.
IAA authors: 
Zerbi, F. M.;Rodriguez, E.;Garrido, R.;Martin, S.
Authors: 
Zerbi, F. M.;Rodriguez, E.;Garrido, R.;Martin, S.;Akan, K.;Luedeke, K.;Keskin, V.;_solaribanoùglu, C.;Evren, S.;Tunca, Z.;Pekunlu, R.;Paparo, M.;Nuspl, J.;Krisciunas, K.;Jiang, S. Y.
Journal: 
Monthly Notices of the Royal Astronomical Society
Publication type: 
Article
Volume: 
292
Pages: 
43
Abstract: 
We present in this paper 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 f_1=1.2328, f_2=1.0899 and f_3=2.3501 d^-1, and a long-term trend f_4=0.1301 d^-1. 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 f_1=1.2321 d^-1, showing amplitude modulation with frequency f_4=0.1301 d^-1. The presence in the power spectra of the coupling terms f_2=f_1-f_4 and f_3=f_1+f_4-1 supports the latter interpretation. In the monoperiodic case the previously given interpretation based on a spot carried through the visible disc by rotation still holds, provided that the spot is bright and evolves on a time-scale of a few days. However, similarities with other gammaDor stars provide indirect indication in favour of the existence of a non-radial pulsation interpretation.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/1997MNRAS.292...43Z/abstract
ADS Bibcode: 
1997MNRAS.292...43Z
Keywords: 
F Stars;Variable Stars;Astronomical Photometry;Stellar Spectra;Stellar Rotation;Astrophysics;STARS: INDIVIDUAL: HD 164615;STARS: VARIABLES: OTHER