Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012arep...56..124b&link_type=abstract
Astronomy Reports, Volume 56, Issue 2, pp.124-130
Astronomy and Astrophysics
Astronomy
Scientific paper
We present JHKLM photometry of the carbon stars ST And and T Lyn acquired in 2000-2010. Along with brightness variations due to pulsations, changes on timescales of 2000-3000 days are also observed. Our combined light curves can be satisfactorily represented with light elements derived from visual observations, but the maxima are delayed relative to the calculated times. A color-index analysis demonstrates that the dust shell of ST And is fairly weak, and is manifest only episodically, while the presence of hot dust was always detected for T Lyn. These results confirm models of spherically symmetric stellar dust shells based on mean-flux data, supplemented with observations in the intermediate IR from the IRAS and AKARI satellites. The visual optical depth of the relatively cool dust shell of ST And assuming a dust temperature at the inner edge of T 1 = 510 K is very low: τ V = 0.047. The dust shell of T Lyn is considerably hotter ( T 1 = 940 K), with τ V = 0.95. We estimate the mass-loss rate to be 1.8 × 10-7 M &sun;/year for ST And and 3.7 × 10-7 M &sun;/year for T Lyn.
Bogdanov Mikhail B.
Taranova O. G.
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