Query : 2008A&A...491..229R

2008A&A...491..229R - Astronomy and Astrophysics, volume 491, 229-238 (2008/11-3)

The Antares emission nebula and mass loss of α Scorpii A.


Abstract (from CDS):

The Antares nebula is a peculiar emission nebula seen in numerous [FeII] lines and in radio free-free emission, probably associated with the HII region caused by α Sco B in the wind of α Sco A. High-resolution spectra with spatial resolution were used to study the emission line spectrum, the physical nature of the nebula and to determine the mass-loss rate of the M supergiant α Sco A. The Antares nebula was mapped with long-slit (10") and high-resolution optical and GHRS/HST spectra with Hα velocities, the HII region is found to be located ∼215AU behind the plane of the sky of α Sco A. From the Hα/[NII] intensity ratio and the non-visibility of the [OII] 3726/3729Å lines we estimate a low mean electron temperature of <T>e=4900K and an N abundance enhanced by a factor of ∼3 due to the CNO cycle in α Sco A. The shape and size of the HII region yield a mean mass-loss rate of (1.05±0.3)x10–6M/yr. The [FeII] lines originate predominantly at the edges (rear and front) of the HII region. UV continuum pumping as well as collisional excitation seem to be responsible for the observed iron lines.

Abstract Copyright:

Journal keyword(s): binaries: visual - circumstellar matter - stars: mass-loss - stars: late-type

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 M 42 OpC 05 35 17 -05 23.4           ~ 4000 0
2 IC 4606 HII 16 29 -26.6           ~ 7 0
3 * alf Sco B Em* 16 29 24.20 -26 25 51.0   5.0 5.2     B2.5V 115 0
4 * alf Sco s*r 16 29 24.45970 -26 25 55.2094 4.08 2.75 0.91 -0.64 -1.87 M1.5Iab+B2Vn 739 0

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