The ? Dor variable HR 8799: Results from a multisite campaign
Küçük Resim Yok
Tarih
1999
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Blackwell Publishing Ltd
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this paper, we present the results of a multisite photometric campaign devoted to the ? 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 1? 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 ? 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.
Açıklama
Anahtar Kelimeler
Stars: individual: HR 8799, Stars: oscillations, Stars: variables: other
Kaynak
Monthly Notices of the Royal Astronomical Society
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
303
Sayı
2
