Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010astl...36..134t&link_type=abstract
Astronomy Letters, Volume 36, Issue 2, pp.134-143
Astronomy and Astrophysics
Astronomy
2
Rv Tau Variable Stars, Infrared Photometry, Variability, Dust Shells
Scientific paper
We have analyzed our long-term (1995-2008) JHKLM photometry for three variable RV Tau supergiants. It follows from this analysis that: the amplitude of the JHK brightness variations is approximately the same, 0 m . 9-1 m , for the three stars; a negative linear trend is noticeable in the variations of the mean J brightness for AC Her; and the mean J brightness of R Sct and V Vul remained constant. The observed J brightness fluctuations in the supergiants are shown to be consistent either only with the temperature pulsations (AC Her and V Vul) or with the temperature and radial pulsations (R Sct). We have detected long-term pulsations in the J brightness and J- H color variations of the supergiants with the following characteristic time scales: ˜1500 days (AC Her), ˜3500 days (R Sct), and ˜800 and ˜1500 days (V Vul). Our search for a periodic component in the infrared brightness variations of the three stars has revealed periods that differ from those obtained from optical observations. We show that relatively hot dust shells ( T d ˜ 700-800 K) exist around the supergiants under study; the densest and most massive shell was observed for V Vul. The ranges of optical-depth variations for the dust shells were τ(1.25 µm) ≈ 0.04-0.10 (AC Her), ≈0.02-0.12 (R Sct), and ≈0.18-0.32 (V Vul). The spectral types in the infrared varied over narrower ranges than those that followed from optical observations of these stars.
Shenavrin V. I.
Taranova O. G.
Tatarnikov A. M.
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