Bibcode
Simón-Díaz, S.; Uytterhoeven, K.; Herrero, A.; Castro, N.; Puls, J.
Referencia bibliográfica
Astronomische Nachrichten, Vol.331, Issue 9/10, p.1069
Advertised on:
12
2010
Número de citas
7
Número de citas referidas
5
Descripción
The spectrum of O and B Supergiants is known to be affected by an
important extra line-broadening (usually called macroturbulence) that
adds to stellar rotation. Recent analysis of high resolution spectra has
shown that the interpretation of this line-broadening as a consequence
of large-scale turbulent motions would imply highly super-sonic velocity
fields, making this scenario quite improbable. Stellar oscillations have
been proposed as a likely alternative explanation. We present first
encouraging results of an observational project aimed at investigating
the macroturbulent broadening in O and B Supergiants, and its possible
connection with spectroscopic variability phenomena and stellar
oscillations: a) all the studied B Supergiants show line profile
variations, quantified by means of the first (< v >) and third
velocity (< v3 >) moments of the lines, b) there is a
strong correlation between the peak-to-peak amplitudes of the < v
> and < v3 > variability and the size of the
extra-broadening.
Based on observations made with the Nordic Optical Telescope, operated
on the island of La Palma jointly by Denmark, Finland, Iceland, Norway,
and Sweden, in the Spanish Observatorio del Roque de los Muchachos of
the Instituto de Astrofisica de Canarias.
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Sergio
Simón Díaz