2007A&A...469..671J


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET13:10:19

2007A&A...469..671J - Astronomy and Astrophysics, volume 469, 671-680 (2007/7-2)

Atmospheric dynamics and the mass loss process in red supergiant stars.

JOSSELIN E. and PLEZ B.

Abstract (from CDS):

Red supergiant stars represent a key phase in the evolution of massive stars. Recent radiative hydrodynamic simulations suggest that their atmospheres may be the location of large-scale convective motions. As supergiant convection is expected to generate supersonic motions and shocks, we seek constraints on these atmospheric motions and their possible relation with mass-loss rates. We present high-resolution, visible spectroscopy of a sample of red supergiants (spectral type M I) and analyse them with a tomographic technique. We observe steep velocity gradients, characterising both upward and downward supersonic motions, which are time variable on time scales of a few hundred days. These convective motions will generate turbulent pressure, which will strongly decrease the effective gravity. We suggest that this decrease, combined with radiative pressure on molecular lines, initiate the mass loss in red supergiant stars.

Abstract Copyright:

Journal keyword(s): supergiants - stars: atmospheres - stars: mass-loss

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* HS Cas s*r 01 08 19.9201927629 +63 35 11.504718283 14.52 12.33 9.82     M4Ia 44 0
2 V* V466 Cas LP* 01 19 53.6178739342 +58 18 30.744479337 13.04 10.74 8.62 6.86 5.44 M0.5Ib 63 0
3 V* XX Per LP* 02 03 09.3584858564 +55 13 56.623349355 11.66 10.34 8.20 6.02 4.19 M4Ib+ 80 0
4 V* AD Per s*r 02 20 29.0027235674 +56 59 35.243403712 12.70 10.16 7.8490   7.1111 M3Iab 119 1
5 V* FZ Per s*r 02 20 59.6453535686 +57 09 29.965933600 12.75 10.20 7.9620   6.7185 M1Iab 105 0
6 Ass Aur OB 1 As* 05 22 +33.9           ~ 76 0
7 V* NO Aur s*r 05 40 42.0501780592 +31 55 14.202295199 10.52 8.30 6.21 4.43 3.02 M2Iab 137 1
8 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1497 0
9 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 1014 0
10 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2152 0
11 V* UY Sct s*r 18 27 36.5286196699 -12 27 58.893326502   14.20 11.20 9.51 6.93 M4Iae 53 0
12 V* V336 Vul s*r 19 34 41.9084829814 +23 53 22.350545182   10.82 8.60     M2/3I 22 0
13 V* NR Vul s*r 19 50 11.9279772343 +24 55 24.177460007   12.41 9.36 6.60 4.49 M1Ia: 72 0
14 V* BI Cyg s*r 20 21 21.8871531507 +36 55 55.725144903   11.48 8.40     M4Iab 98 0
15 V* BC Cyg s*r 20 21 38.5480930133 +37 31 58.917783927   14.61 11.30     M3.5Ia 154 0
16 V* RW Cyg s*r 20 28 50.5902663365 +39 58 54.418023246 13.00 10.60 8.00 5.32 3.25 M3-M4Ia-Iab 112 0
17 HD 203338 LP? 21 19 15.6844340919 +58 37 24.634540958 7.09 7.09 5.75 4.26 2.93 M1Ibep 109 0
18 V* SW Cep LP* 21 25 45.9184367578 +62 34 26.431767346 15.40 13.16 10.80     M5 40 0
19 * mu. Cep s*r 21 43 30.4610574 +58 46 48.160181 8.85 6.43 4.08 1.98 0.22 M2-Ia 624 1
20 V* VV Cep Al* 21 56 39.1438495 +63 37 32.017439 7.03 6.65 4.90 3.19 1.85 M2epIa-Iab+B8:eV 429 1
21 V* RW Cep s*r 22 23 07.0152079533 +55 57 47.616196874 11.25 8.87 6.65 4.94 3.78 K2_0-Ia 151 0
22 V* ST Cep s*r 22 30 10.7378149736 +57 00 03.067223413 14.30 11.98 9.70 7.50 5.75 M2Ia-Iab 73 0
23 V* U Lac s*r 22 47 43.4264404880 +55 09 30.316069125 13.20 11.74 9.40     M3Ia 71 0
24 V* V386 Cep LP* 22 53 12.3314657743 +61 17 00.550458793           M3Ib 44 0
25 V* V582 Cas Mi* 23 30 11.2238360123 +60 16 45.406787814       10.84   M4I 28 0
26 V* TZ Cas s*r 23 52 56.2369314439 +61 00 08.390398268 14.18 11.75 9.18     M3Iab 81 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-13:10:19

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