Other
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...446l..23b&link_type=abstract
Astrophysical Journal Letters v.446, p.L23
Other
52
Stars: Binaries: Close, Stars: Individual Henry Draper Number: Hd 60435, Stars: Variables: Other Luminous Blue Variables, Stars: Wolf-Rayet
Scientific paper
We report a sudden outburst-like behavior of the WR binary system HD 5980 in the SMC, as disclosed by spectroscopic and photometric observations performed in 1994 October and November. Our spectra show that the WR type spectrum of HD 5980 has changed drastically, now exhibiting a luminous blue variable (LBV) type spectrum with strong emission of H I and He I with P Cyg profiles and weaker emissions of N II, Si II, Si III, and Fe III. The previously dominant He II 4686 ÅA emission has remarkably weakened and other WR type emission lines have disappeared. Our photometry of HD 5980 reveals a visual brightening of 2.3 mag. The behavior shown by HD 5980, i.e., the transformation of a WNE star in a sort of LBV star, is unprecedented.
Barba Rodolfo H.
Baume Gustavo
Niemela Virpi S.
Vázquez Ricardo A.
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