Query : 2004A&A...414..223T

2004A&A...414..223T - Astronomy and Astrophysics, volume 414, 223-233 (2004/1-4)

On the light echo in V838 Mon.


Abstract (from CDS):

We present a theoretical outline of the light echo phenomenon and results of simple numerical simulations and we study the available images of the light echo in V838 Mon obtained with HST. An investigation of the observed expansion of the light echo leads us to conclude that the distance to V838 Mon is >5kpc. From an analysis of the inner bright echo rim we estimate the distance to be 8.0±2.0kpc. We also investigate the structure of the dust distribution in the vicinity of the object. We find no obvious signs of spherical symmetry in the resultant distribution. Near the central object there is a strongly asymmetric dust-free region which we interpret as produced by a fast wind from the V838 Mon system. The asymmetry would imply that V838 Mon is moving relative to the dusty medium. From these results we conclude that the dust illuminated by the light echo is of interstellar origin rather than produced by mass loss from V838 Mon in the past.

Abstract Copyright:

Journal keyword(s): stars: individual: V838 Mon - stars: distances - stars: circumstellar matter - ISM: reflection nebulae

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 V* GK Per No* 03 31 12.0098863320 +43 54 15.469951212   14.139 13.090 12.589   K1IV 929 0
2 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4907 2
3 V* V838 Mon No* 07 04 04.8221494992 -03 50 50.648894412       15.181 14.51 M10+B3V 418 0

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