A Time-Series Analysis of the H alpha Emission Line in V3885 Sagitarii

Autor(es)

Ribeiro, Fabiola M. A. ^[1] ; Diaz, Marcos P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN; v. 61, n. 1, p. 137-146, 2009.
• Citações Web of Science: 1

Resumo

Flickering is a phenomenon related to mass accretion observed among many classes of astrophysical objects. In this paper we present a study of flickering emission lines and the continuum of the cataclysmic variable V3885 Sgr. The flickering behavior was first analyzed through statistical analysis and the power spectra of lightcurves. Autocorrelation techniques were then employed to estimate the flickering timescale of flares. A cross-correlation study between the line and its underlying continuum variability is presented. The cross-correlation between the photometric and spectroscopic data is also discussed. Periodograms, calculated using emission-line data, show a behavior that is similar to those obtained from photometric datasets found in the literature, with a plateau at lower frequencies and a power-law at higher frequencies. The power-law index is consistent with stochastic events. The cross-correlation study indicates the presence of a correlation between the variability on Ha and its underlying continuum. Flickering timescales derived from the photometric data were estimated to be 25 min for two lightcurves and 10 min for one of them. The average timescales of the line flickering is 40 min, while for its underlying continuum it drops to 20 min. (AU)

• Processo FAPESP: 06/03308-2 - Um estudo tomografico de ventos em variaveis cataclismicas
• Beneficiário: Fabiola Mariana Aguiar Ribeiro
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 01/07078-8 - Uma análise espectroscópica de discos de acreção em variáveis cataclísmicas
• Beneficiário: Fabiola Mariana Aguiar Ribeiro
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto