TY - JOUR
T1 - N II λλ5668-5712
T2 - A New class of spectral features in eta Carinae
AU - Mehner, Andrea
AU - Davidson, Kris
AU - Ferland, Gary J.
PY - 2011/8/20
Y1 - 2011/8/20
N2 - We report on the N II λλ5668-5712 emission and absorption lines in the spectrum of η 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.
AB - We report on the N II λλ5668-5712 emission and absorption lines in the spectrum of η 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.
KW - stars: emission-line, Be
KW - stars: individual (eta Carinae)
KW - stars: variables: general
KW - stars: winds, outflows
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U2 - 10.1088/0004-637X/737/2/70
DO - 10.1088/0004-637X/737/2/70
M3 - Article
AN - SCOPUS:80052052950
SN - 0004-637X
VL - 737
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 70
ER -