SIMBAD references

1999MNRAS.303..275Z - Mon. Not. R. Astron. Soc., 303, 275-283 (1999/February-3)

The gamma Dor variable HR 8799: results from a multisite campaign.

ZERBI F.M., RODRIGUEZ E., GARRIDO R., MARTIN S., ARELLANO FERRO A., SAREYAN J.-P., KRISCIUNAS K., AKAN M.C., EVREN S., IBANOGLU C., KESKIN V., PEKUENLUE R., TUNCA Z., LUEDEKE K., PAPARO M., NUSPL J. and GUERRERO G.

Abstract (from CDS):

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.

Abstract Copyright: 1999 RAS

Journal keyword(s): stars: individual: HR 8799 - stars: pulsation - stars: variables: other

Simbad objects: 10

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