SIMBAD references

2010ApJ...720L.174S - Astrophys. J., 720, L174-L178 (2010/September-2)

Observational evidence for a correlation between macroturbulent broadening and line-profile variations in OB supergiants.

SIMON-DIAZ S., HERRERO A., UYTTERHOEVEN K., CASTRO N., AERTS C. and PULS J.

Abstract (from CDS):

The spectra of O and B supergiants (Sgs) are known to be affected by a significant form of extra line broadening (usually referred to as macroturbulence) in addition to that produced by stellar rotation. Recent analyses of high-resolution spectra have shown that the interpretation of this line broadening as a consequence of large-scale turbulent motions would imply highly supersonic velocity fields in photospheric regions, making this scenario quite improbable. Stellar oscillations have been proposed as a likely alternative explanation. As part of a long-term observational project, we are investigating the macroturbulent broadening in O and B Sgs and its possible connection with spectroscopic variability phenomena and stellar oscillations. In this Letter, we present the first encouraging results of our project, namely, firm observational evidence for a strong correlation between the extra broadening and photospheric line-profile variations in a sample of 13 Sgs with spectral types ranging from O9.5 to B8.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: early-type - stars: oscillations - stars: rotation - supergiants

Simbad objects: 19

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2021.09.25-19:49:24

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