Query : 2009A&A...500..827M

2009A&A...500..827M - Astronomy and Astrophysics, volume 500, 827-831 (2009/6-3)

A high-speed bipolar outflow from the archetypical pulsating star Mira A.


Abstract (from CDS):

Optical images and high-dispersion spectra have been obtained of the ejected material surrounding the pulsating AGB star Mira A. The two streams of knots on either side of the star, found in far-ultraviolet (FUV) GALEX images, have now been imaged clearly in the light of Hα. Spatially resolved profiles of the same line reveal that the bulk of these knots form a bipolar outflow with radial velocity extremes of ±150km/s with respect to the central star. The south stream is approaching and the north stream receding from the observer. A displacement away from Mira A between the position of one of the south-stream knots in the new Hα image and its position in the previous Palomar Observatory Sky Survey (POSS I) red plate was noted. If interpreted as a consequence of expansion proper motions, the bipolar outflow is tilted at 69°±15° to the plane of the sky, has an outflow velocity of 160±10km/s and is ≃1000yr old.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: variables: general - stars: binaries: general - stars: individual: Mira

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1492 0
2 NGC 6302 PN 17 13 44.51256 -37 06 11.3616           O-rich 779 1
3 * P Cyg s*b 20 17 47.2020844 +38 01 58.552724 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1160 1

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