2014A&A...561A..75D


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.20CEST12:50:41

2014A&A...561A..75D - Astronomy and Astrophysics, volume 561A, 75-75 (2014/1-1)

The problematically short superwind of OH/IR stars. Probing the outflow with the 69 µm spectral band of forsterite.

DE VRIES B.L., BLOMMAERT J.A.D.L., WATERS L.B.F.M., WAELKENS C., MIN M., LOMBAERT R. and VAN WINCKEL H.

Abstract (from CDS):

Spectra of OH/IR stars show prominent spectral bands of crystalline olivine (Mg(2–2x)Fe(2x)SiO4). To learn more about the timescale of the outflows of OH/IR stars, we study the spectral band of crystalline olivine at 69 µm. The 69 µm band is of interest because its width and peak wavelength position are sensitive to the grain temperature and to the exact composition of the crystalline olivine. With Herschel/PACS, we observed the 69 µm band in the outflow of 14 OH/IR stars. By comparing the crystalline olivine features of our sample with those of model spectra, we determined the size of the outflow and its crystalline olivine abundance. The temperature indicated by the observed 69 µm bands can only be reproduced by models with a geometrically compact superwind (RSW≲2500 AU = 1400 R*). This means that the superwind started less than 1200 years ago (assuming an outflow velocity of 10 km/s). The small amount of mass lost in one superwind and the high progenitor mass of the OH/IR stars introduce a mass loss and thus evolutionary problem for these objects, which has not yet been understood.

Abstract Copyright:

Journal keyword(s): radiative transfer - stars: atmospheres - stars: AGB and post-AGB - stars: evolution - infrared: stars - dust, extinction

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 IRC +10011 OH* 01 06 25.9889735162 +12 35 52.890666456   20.7   18.26 14.01 M8 391 0
2 OH 127.8 -0.0 OH* 01 33 51.21 +62 26 53.2           M9III 170 0
3 V* NV Aur Mi* 05 11 19.4489549676 +52 52 33.222548186           M10 169 0
4 IRAS 16342-3814 pA* 16 37 39.8700524769 -38 20 17.440442399           ~ 126 0
5 IRAS 17010-3840 OH* 17 04 28.3 -38 44 23           ~ 15 0
6 IRAS 17411-3154 OH* 17 44 24.0038735481 -31 55 35.428622508           ~ 82 0
7 HD 161796 pA* 17 44 55.4696 +50 02 39.484 8.00 7.68 7.21 6.77 6.51 F3Ib 308 0
8 OH 2.6 -0.4 OH* 17 53 18.66432 -26 56 36.5748           M8-9 70 0
9 OH 21.5 +0.5 OH* 18 28 30.937 -09 58 14.32           ~ 87 0
10 OH 26.5 +0.6 OH* 18 37 32.51 -05 23 59.2           ~ 280 0
11 OH 30.1 -0.7 OH* 18 48 41.949 -02 50 28.85           ~ 90 0
12 OH 32.8 -0.3 OH* 18 52 22.255 -00 14 11.84           ~ 117 0
13 OH 44.8 -2.3 OH* 19 21 36.6418599501 +09 27 56.536908744           ~ 83 0
14 OH 55.0 +0.7 OH* 19 30 29.48 +19 50 41.0           ~ 47 0
15 RAFGL 4259 OH* 20 06 22.74 +27 02 10.6           ~ 38 0
16 IRAS 21554+6204 OH* 21 56 58.195 +62 18 46.02           ~ 42 0
17 NSV 25875 OH* 22 19 27.48 +59 51 21.7           ~ 133 0

    Equat.    Gal    SGal    Ecl

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2019.08.20-12:50:41

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