Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astl...37...30t&link_type=abstract
Astronomy Letters, Volume 37, Issue 1, pp.30-39
Astronomy and Astrophysics
Astronomy
1
Wolf-Rayet Stars, Infrared Photometry, Variability, Dust Shells
Scientific paper
We present the results of our infrared observations of WR 140 (=V1687 Cyg) in 2001-2010. Analysis of the observations has shown that the J brightness at maximum increased near the periastron by about 0 m .3; the M brightness increased by ˜2 m in less than 50 days. The minimum J brightness and the minimum L and M brightnesses were observed 550-600 and 1300-1400 days after the maximum, respectively. The JHKLM brightness minimum was observed in the range of orbital phases 0.7-0.9. The parameters of the primary O5 component of the binary have been estimated to be the following: R(O5) ≈ 24.7 R &sun;, L(O5) ≈ 8 × 105 L &sun;, and M bol(O5) ≈ -10 m . At the infrared brightness minimum, T g ˜ 820-880 K, R g ≈ 2.6 × 105 R &sun;, the optical depth of the shell at 3.5 µm is ˜5.3 × 10-6, and its mass is ≈1.4 × 10-8 M &sun;. At the maximum, the corresponding parameters are ˜1300 K, 8.6 × 104 R &sun;, ˜2 × 10-4, and ˜6 × 10-8 M &sun;; the mean rate of dust inflow (condensation) into the dust structure is ˜3.3 × 10-8 M &sun; yr-1. The mean escape velocity of the shell from the heating source is ˜103 km s-1 and the mean dispersal rate of the shell is ˜1.1 × 10-8 M &sun; yr-1.
Shenavrin V. I.
Taranova O. G.
No associations
LandOfFree
WR 140 (=V1687 Cyg): Infrared photometry, 2001-2010 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with WR 140 (=V1687 Cyg): Infrared photometry, 2001-2010, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and WR 140 (=V1687 Cyg): Infrared photometry, 2001-2010 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1586921