¿y que diablos es eso en el cielo?
pues
RA 2000 23h19m12s
Dec2000 +17 11' 33"
USNO B1.0 1071-0708610
GSC-2.3 N0Q2006855
Cross IDs: , LR77, LL Peg, Sop85, VKL92, GWSK, AFGL 3068,
Cool Galactic Carbon Star CGCS 6913 (aunque la posición y la precisión estimada no coinciden bien)
IR mag
17 J Band
9.6 K band
( 22 en B - azul, 19 en R - rojo , .... es como un radiador )
https://www.spacetelescope.org/static/archives/releases/science_papers/potw1020.pdfA Binary-Induced Pinwheel Outflow from the Extreme Carbon Star, AFGL 3068
Abstract. The extreme carbon star, AFGL 3068, is losing mass at a rate in excess of 10−4
Msolar yr−1, and has so far been detected only in the infrared because it is hidden by a thick
dust photosphere having a color temperature of ∼300K. Using the ACS camera on HST, we
have imaged AFGL 3068 with broad-band filters at 0.6 and 0.8 μm and find a thin, apparently
continuous spiral arc winding 4 or 5 times around the location of the star, from angular radii of
2 to 10 arcsec. We interpret this as the projection of nested spiral shells such as were predicted
to occur when the mass-losing star is a member of a binary system. In this case, the illumination
is presumably provided by ambient galactic starlight. Subsequent near-IR observations with the
NIRC2 camera on the Keck II telescope using adaptive optics reveal that AFGL 3068 has two
components separated by 0.11 arcsec, or 109 AU at a distance of 1 kpc. One very red component
is presumably the mass-losing carbon star, while the other component is apparently a much
bluer companion. Assuming each component has mass M(Msolar), and ignoring the projection of
the separation vector, we find the binary period to be 810 M−0.5 yrs, strikingly comparable to
the 710-yr separation of the shells obtained from the known outflow velocity of 14.7 km s−1.
Keywords. stars: AGB and post-AGB, stars: carbon, binaries: general, stars: winds, outflows
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