2014A&A...572L...9R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:33:27

2014A&A...572L...9R - Astronomy and Astrophysics, volume 572, L9-9 (2014/12-1)

ALMA sub-mm maser and dust distribution of VY Canis Majoris.

RICHARDS A.M.S., IMPELLIZZERI C.M.V., HUMPHREYS E.M., VLAHAKIS C., VLEMMINGS W., BAUDRY A., DE BECK E., DECIN L., ETOKA S., GRAY M.D., HARPER G.M., HUNTER T.R., KERVELLA P., KERSCHBAUM F., McDONALD I., MELNICK G., MULLER S., NEUFELD D., O'GORMAN E., PARFENOV S.Yu., PECK A.B., SHINNAGA H., SOBOLEV A.M., TESTI L., USCANGA L., WOOTTEN A., YATES J.A. and ZIJLSTRA A.

Abstract (from CDS):

Cool, evolved stars have copious, enriched winds. Observations have so far not fully constrained models for the shaping and acceleration of these winds. We need to understand the dynamics better, from the pulsating stellar surface to ∼10 stellar radii, where radiation pressure on dust is fully effective. Asymmetric nebulae around some red supergiants imply the action of additional forces. We retrieved ALMA Science Verification data providing images of sub-mm line and continuum emission from VY CMa. This enables us to locate water masers with milli-arcsec accuracy and to resolve the dusty continuum. The 658, 321, and 325GHz masers lie in irregular, thick shells at increasing distances from the centre of expansion. For the first time this is confirmed as the stellar position, coinciding with a compact peak offset to the NW of the brightest continuum emission. The maser shells overlap but avoid each other on scales of up to 10au. Their distribution is broadly consistent with excitation models but the conditions and kinematics are complicated by wind collisions, clumping, and asymmetries.

Abstract Copyright:

Journal keyword(s): stars: individual: VY CMa - supergiants - stars: mass-loss - masers

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* S Per s*r 02 22 51.7103845023 +58 35 11.454759954 13.22 10.55 7.90     M4.5-7Iae 354 0
2 QSO B0521-365 BLL 05 22 57.9839686440 -36 27 30.847737786   15.26 14.62 14.48   ~ 712 2
3 QSO B0646-306 QSO 06 48 14.09647071 -30 44 19.6596827   19.53 20.4 18.75   ~ 84 1
4 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 996 0
5 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 697 2

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:33:27

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