Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ap%26ss.304..311k&link_type=abstract
Astrophysics and Space Science, Volume 304, Issue 1-4, pp. 311-313
Astronomy and Astrophysics
Astrophysics
Rr Tel, Ir Photometry, Dust, Miras, Reddening, Distance
Scientific paper
JHKL photometry of the symbiotic Mira RR Tel over 25 years shows variable fading in all bands, which can be explained by variable obscuration due to dust. The evolutionary track of the star is presented in a two-colour diagram together with the corresponding mean values for normal Miras with thick and thin dust shells and pulsation periods between 350 and 600 days. The observed colours for RR Tel are significantly shifted from the range shown by normal unreddened Miras. The distance of RR Tel is estimated from its K magnitude and the Mira period luminosity relation after correcting for reddening. The dust envelope is discussed with respect to a simple model involving two blackbodies. There appears to be rather little dust emission even at 3 μm, but considerable extinction.
Friedjung Michael
Kotnik-Karuza Dubravka
Whitelock Patricia
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