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| Paper: |
The Variable Line Width of Achernar |
| Volume: |
506, Bright Emissaries: Be Stars as Messengers of Star-Disk Physics |
| Page: |
17 |
| Authors: |
Rivinius, Th.; Townsend, R.H.D.; Baade, D.; Carciofi, A.C.; Leister, N.; ̌Stefl, S. |
| Abstract: |
Spectroscopic observations of Achernar over the past decades, have shown the
photospheric line width, as measured by the rotational parameter v sin i,
to vary in correlation with the emission activity. Here we present new
observations, covering the most recent activity phase, and further archival
data collected from the archives. The v sin i variation is confirmed. On
the basis of the available data it cannot be decided with certainty whether
the increased line width precedes the emission activity, i.e. is a signature
of the ejection mechanism, or postdates it, which would make it a signature of
re-accretion of some of the disk-material. However, the observed evidence
leans towards the re-accretion hypothesis. Two further stars showing the
effect of variable line width in correlation with emission activity, namely
66 Oph and π Aqr, are presented as well. |
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