Astronomy and Astrophysics – Astronomy
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006arep...50..387b&link_type=abstract
Astronomy Reports, vol. 50, Issue 5, p.387-391
Astronomy and Astrophysics
Astronomy
Pacs Numbers 97.30.J
Scientific paper
We present the results of JHKLM photometry of the oxygen Mira variable V2108 Oph acquired in 2000 2004. The period of brightness variations is refined (570 ± 3 days), and light and color curves in the near-IR are presented. The mean fluxes, color temperatures, and sizes for two blackbodies representing the combined radiation of the star and dust shell at minimum and maximum brightness are estimated. Additional IRAS data were used to compute a model with a spherically symmetric dust shell of silicate grains; the best-fit model has a radius for its inner boundary of 2.4 × 1014 cm, a dust temperature at this boundary of 1150 K, an optical depth of the shell at 0.55 µm of 16.8, and implies a distance to the star of 980 pc. We estimate the mass-loss rate for V2108 Oph to be 1.2 × 10-5 M &sun;/yr.
Bogdanov Mikhail B.
Shenavrin V. I.
Taranova O. G.
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