2007A&A...465..457C


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST12:01:11

2007A&A...465..457C - Astronomy and Astrophysics, volume 465, 457-467 (2007/4-2)

Arcsecond-resolution 12CO mapping of the yellow hypergiants IRC +10420 and AFGL 2343.

CASTRO-CARRIZO A., QUINTANA-LACACI G., BUJARRABAL V., NERI R. and ALCOLEA J.

Abstract (from CDS):

IRC+10420 and AFGL2343 are the unique, known yellow hypergiants (YHGs) presenting a heavy circumstellar envelope (CSE). We aim to study the morphology, exceptional kinematics, and excitation conditions of their CSEs, and the implications for mass-loss processes. We have mapped the 12CO J=2-1 and 1-0 emission in these YHGs with the IRAM Plateau de Bure interferometer and the 30m telescope. We developed LVG models in order to analyze their circumstellar characteristics. The maps show that the overall shape of both CSEs is approximately spherical, although they also reveal several aspherical features. The CSE around IRC+10420 shows a rounded extended halo surrounding a bright inner region, with both components presenting aspherical characteristics. It presents a brightness minimum at the center. The envelope around AFGL2343 is a detached shell, showing spherical symmetry and clumpiness at a level of ∼15% of the maximum brightness. The envelopes expand isotropically at ∼35 km/s, about two or three times faster than typical CSEs around AGB stars. High temperatures (∼200K) are derived for the innermost regions in IRC+10420, while denser and cooler (∼30K) gas is found in AFGL2343. The mass-loss processes in these YHGs have been found to be similar. The deduced mass-loss rates (∼10–4-10–3M/yr) are much higher than those obtained in AGB stars, and they present significant variations on time scales of ∼1000yr.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: mass-loss - radio lines: stars - stars: individual: IRC+10420 - stars: individual: AFGL2343

Simbad objects: 22

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Number of rows : 22

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 * b Vel V* 08 40 37.5701711 -46 38 55.476997 4.86 4.52 3.81 3.16 2.62 F0Ia 126 0
2 HD 80077 s*b 09 15 54.7869106351 -49 58 24.573847509 10.50 10.29 9.00 7.89   B2Ia+e 122 0
3 * x Car cC* 11 08 35.3899998 -58 58 30.135741 6.07 5.09 3.83 2.86 2.27 G5_0-Ia 140 0
4 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5242 1
5 HD 119796 ** 13 47 10.86726 -62 35 22.9574 10.24 9.05 6.80 4.74 3.54 G8Ia++B0Ibp: 116 0
6 HD 119796A s*y 13 47 10.875 -62 35 23.06   9.329 6.830 6.81   K0_0-Ia 110 0
7 QSO B1741-038 QSO 17 43 58.85613396 -03 50 04.6166450     18.5 17.98   ~ 465 1
8 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 784 1
9 EM* MWC 300 Ae* 18 29 25.6915000349 -06 04 37.289920628 12.55 12.67 13.795     B1Ia+[e] 125 0
10 V* S Sct C* 18 50 20.0367524071 -07 54 27.430964220 13.93 9.89 6.80     C-N5 193 0
11 HD 179821 pA* 19 13 58.6083165753 +00 07 31.934676028 10.81 9.694 8.19     G4_0-Ia 216 0
12 ICRF J192559.6+210626 QSO 19 25 59.60535560 +21 06 26.1620442           ~ 172 1
13 IRC +10420 pA* 19 26 48.0981288433 +11 21 16.756524951   13.98 11.66     F8Ia+e 448 0
14 V* TT Cyg C* 19 40 57.0159854799 +32 37 05.755486755   10.43 10.20     C-N5- 185 0
15 V* KY Cyg s*r 20 25 58.0435813037 +38 21 07.675238156   13.62 13.50     M3Ia 91 0
16 EM* MWC 349 Em* 20 32 45.6328 +40 39 36.143   15.88 13.15 12.13   Bep 689 1
17 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 825 1
18 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 148 0
19 V* V509 Cas LP* 23 00 05.1007915562 +56 56 43.348681058 8.01 6.68 5.13 3.96 3.11 G4_0 307 0
20 HD 217459 PM* 23 00 42.9002609517 +03 00 42.492698453   7.204 5.848     K2/3III 42 0
21 * 6 Cas sg* 23 48 50.17052 +62 12 52.2577 6.08 6.10 5.43     A3Ia+ 178 0
22 * rho Cas LP* 23 54 23.0339951270 +57 29 57.766930774 7.00 5.85 4.59 3.63 2.89 G2_0 357 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-12:01:11

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