Bibcode
Lennon, D. J.; Howarth, I. D.; Herrero, A.; Walborn, N. R.
Referencia bibliográfica
The Newsletter of the Isaac Newton Group of Telescopes (ING Newsl.), issue no. 9, p. 18-19.
Fecha de publicación:
3
2005
Número de citas
0
Número de citas referidas
0
Descripción
There are three known Of?p stars in our galaxy, they are the well known
peculiar stars HD108, HD148937 and HD191612. The question mark in their
spectral classification was introduced by Walborn (1972) to indicate
doubt that these stars are normal Of supergiants. They are characterised
by their CIII 4647, 4650, 4651 emission lines being comparable in
strength to their NIII 4634, 4640, 4642 emission lines, unlike normal Of
supergiants where the CIII lines are always much weaker. In addition the
ultra-violet spectra of Of?p stars also exhibit a stellar wind
morphology more akin to O-type giants than to Of supergiants. HD191612
came to our attention when N. R. Walborn noticed that the spectrum
discussed by Herrero et al. (1992) was different from the discovery
spectrum of Walborn (1973).