2004A&A...428L..13D


Query : 2004A&A...428L..13D

2004A&A...428L..13D - Astronomy and Astrophysics, volume 428, L13-16 (2004/12-2)

First detection of dust clouds around R CrB variable stars.

DE LAVERNY P. and MEKARNIA D.

Abstract (from CDS):

From VLT/NACO diffraction-limited images of RY Sgr, we report the first direct detection of heterogeneities in the circumstellar envelope of a R Coronae Borealis variable star. Several bright and very large dust clouds are seen in various directions at several hundred stellar radii from RY Sgr, revealing high activity for the ejection of stellar material by R CrB variables. These observations do support the current interpretation that optically thick dust clouds are formed around the surface of this type of variable stars and, when passing between the star and the observer, produce the huge and sudden declines characterizing these objects in visible light. This is the first direct confirmation of a scenario proposed about 70 years ago.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: variables: general - stars: individual: RY Sgr - stars: mass-loss - stars:circumstellar matter - techniques: high angular resolution

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11040 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17259 1
3 V* RY Sgr RC* 19 16 32.7668605944 -33 31 20.340212592 6.20 6.27 6.25     Cpec 363 0

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