The γ Dor variable HR 8799: Results from a multisite campaign

F. M. Zerbi, E. Rodríguez, R. Garrido, S. Martín, A. Arellano Ferro, J. P. Sareyan, K. Krisciunas, M. C. Akan, S. Evren, C. Ibanoǧlu, V. Keskin, R. Pekünlü, Z. Tunca, K. Luedeke, M. Paparó, J. Nuspl, G. Guerrero

Research output: Contribution to journalArticle

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Abstract

In this paper, we present the results of a multisite photometric campaign devoted to the γ Doradus type variable HR 8799. From Johnson and Strömgren data, we were able to identify three independent frequencies (f1, = 1.9791 cycle d-1,f2 = 1.7268 cycle d-1 and f3 = 1.6498 cycle d-1) as well as another signal, which we are able to identify as the coupling term between two of the frequencies (f4 = f1 - f2 = 0.2479 cycle d-1). These four frequencies are able to account for all of the observed variations down to the 1σ significance level. We discuss another possible interpretation of these frequencies using a model of quasi-stochastic amplitude modulation. In this scenario, we are able to show that HR 8799 might be pulsating with two independent frequencies, one of which undergoes amplitude modulation similar to other γ Dor objects. In addition, we discuss a preliminary mode identification based on the observed colour curves. Finally, 18 simultaneous, high-resolution echelle spectra were collected on two nights and we qualitatively compare the radial velocities from these data with our photometry.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume303
Issue number2
Publication statusPublished - Feb 21 1999

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cycles
night
radial velocity
photometry
color
high resolution
curves

Keywords

  • Stars: individual: HR 8799
  • Stars: oscillations
  • Stars: variables: other

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Zerbi, F. M., Rodríguez, E., Garrido, R., Martín, S., Arellano Ferro, A., Sareyan, J. P., ... Guerrero, G. (1999). The γ Dor variable HR 8799: Results from a multisite campaign. Monthly Notices of the Royal Astronomical Society, 303(2), 275-283.

The γ Dor variable HR 8799 : Results from a multisite campaign. / Zerbi, F. M.; Rodríguez, E.; Garrido, R.; Martín, S.; Arellano Ferro, A.; Sareyan, J. P.; Krisciunas, K.; Akan, M. C.; Evren, S.; Ibanoǧlu, C.; Keskin, V.; Pekünlü, R.; Tunca, Z.; Luedeke, K.; Paparó, M.; Nuspl, J.; Guerrero, G.

In: Monthly Notices of the Royal Astronomical Society, Vol. 303, No. 2, 21.02.1999, p. 275-283.

Research output: Contribution to journalArticle

Zerbi, FM, Rodríguez, E, Garrido, R, Martín, S, Arellano Ferro, A, Sareyan, JP, Krisciunas, K, Akan, MC, Evren, S, Ibanoǧlu, C, Keskin, V, Pekünlü, R, Tunca, Z, Luedeke, K, Paparó, M, Nuspl, J & Guerrero, G 1999, 'The γ Dor variable HR 8799: Results from a multisite campaign', Monthly Notices of the Royal Astronomical Society, vol. 303, no. 2, pp. 275-283.
Zerbi FM, Rodríguez E, Garrido R, Martín S, Arellano Ferro A, Sareyan JP et al. The γ Dor variable HR 8799: Results from a multisite campaign. Monthly Notices of the Royal Astronomical Society. 1999 Feb 21;303(2):275-283.
Zerbi, F. M. ; Rodríguez, E. ; Garrido, R. ; Martín, S. ; Arellano Ferro, A. ; Sareyan, J. P. ; Krisciunas, K. ; Akan, M. C. ; Evren, S. ; Ibanoǧlu, C. ; Keskin, V. ; Pekünlü, R. ; Tunca, Z. ; Luedeke, K. ; Paparó, M. ; Nuspl, J. ; Guerrero, G. / The γ Dor variable HR 8799 : Results from a multisite campaign. In: Monthly Notices of the Royal Astronomical Society. 1999 ; Vol. 303, No. 2. pp. 275-283.
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AU - Garrido, R.

AU - Martín, S.

AU - Arellano Ferro, A.

AU - Sareyan, J. P.

AU - Krisciunas, K.

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AU - Pekünlü, R.

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AU - Nuspl, J.

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