N II lambda lambda 5668-5712: A NEW CLASS OF SPECTRAL FEATURES IN ETA CARINAE

作者：Mehner Andrea^*; Davidson Kris; Ferland Gary J

来源：Astrophysical Journal, 2011, 737(2): 70.

DOI：10.1088/0004-637X/737/2/70

• stars: emission-line, Be
• stars: individual (eta Carinae)
• stars: variables: general
• stars: winds, outflows

We report on the N II lambda lambda 5668-5712 emission and absorption lines in the spectrum of. Carinae. Spectral lines of the stellar wind regions can be classified into four physically distinct categories: (1) low-excitation emission such as H I and Fe II, (2) higher-excitation He I features, (3) the N II lines discussed in this paper, and (4) He II emission. These categories have different combinations of radial velocity behavior, excitation processes, and dependences on the secondary star. The N II lines are the only known features that originate in "normal" undisturbed zones of the primary wind but depend primarily on the location of the hot secondary star. N II probably excludes some proposed models, such as those where He I lines originate in the secondary star's wind or in an accretion disk.

• 出版日期2011-8-20