Discovery of Metastable Helium Absorption Lines in V1280 Scorpii

作者：Naito Hiroyuki^*; Tajitsu Akito; Arai Akira; Sadakane Kozo

来源：Publications of the Astronomical Society of Japan, 2013, 65(2): 37.

DOI：10.1093/pasj/65.2.37

• stars: individual: V1280 Sco
• mass-loss
• novae, cataclysmic variables
• winds, outflows

We report on the discovery of blue-shifted metastable He I* absorption lines at 3188 angstrom and 3889 angstrom with multiple components on high-resolution spectra (R similar to 60000) of V1280 Scorpii. Similar multiple absorption lines associated with the Na ID doublet as well as Ca II H and K were observed. Na I D doublet absorption lines have been observed since 2009, while the metastable He I* absorption lines were absent in 2009, but were detected in 2011 (four years after the burst). We have found different time variations in the depths and velocities of blue-shifted absorption components among He I*, Na I, and Ca II. The complex time evolutions of these lines can be explained by assuming changes in the density and recombination/ionization rate when the ejecta expands and the photosphere contracts to become hotter. The multiple absorption lines originate in ejected materials consisting of clumpy components, which obscure a significant part of the continuum emitting region. We estimate the total mass of the ejected material to be on the order of similar to 10(-4) M-circle dot, using metastable He I* lambda lambda 3188 and 3889 absorption lines.

• 出版日期2013-4-25
• 单位中国科学院国家天文台