Query : 2002A&A...396..581F

2002A&A...396..581F - Astronomy and Astrophysics, volume 396, 581-587 (2002/12-3)

Imaging the circumstellar envelope of OH26.5+0.6.


Abstract (from CDS):

Using the Berkeley-Illinois-Maryland-Association (BIMA) Millimeter Array, we were able to map the extreme OH/IR star, OH26.5+0.6, in the 2co J=1-0 line transition. The CO emission is partially resolved with a deconvolved source size of 8.5"x5.5". The spectrum shows that the blue-shifted emission is missing, most likely due to interstellar absorption. By modelling the infrared spectral energy distribution, we derive a dust mass loss rate of 1.9x10–6M/yr. From this we are able to place an upper limit on the extent of the dusty envelope of 1016cm while our BIMA map shows that the CO photodissociation radius extends out to about 7x1016cm. To best fit the BIMA observations and the higher CO rotational transitions using our full radiative transfer code, we needed to include a second, more tenuous AGB wind, outside the high density superwind to account for the observed flux. From our model, we conclude that up to 80% of the CO flux comes from the unresolved superwind.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: circumstellar matter - stars: individual: OH 26.5+0.6 - stars: late-type - stars: mass loss

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 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2290 0
2 NVSS J173616-130357 Rad 17 36 16.44 -13 04 00.0           ~ 8 1
3 OH 026.5+00.6 OH* 18 37 32.50920 -05 23 59.1936           O-rich 300 1
4 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 864 1

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