Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006astl...32..827g&link_type=abstract
Astronomy Letters, Volume 32, Issue 12, pp.827-831
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We present our photometric observations of the T Tauri star H 187. They confirm our conclusion that a new extended eclipse has begun in this young object. By the end of 2005, H 187 reached its minimum light following which its brightness began to slowly increase. Comparison with the previous ˜3.5-yr-long eclipse observed by Cohen et al. shows that the new eclipse follows the previous eclipse fairly closely and, hence, it was caused by a second passage of the same extended dust or gas-dust cloud around the object. We have estimated the period between these events to be 4.7 yr. The object reddened during the eclipse, suggesting that the extinction was produced by small grains ˜0.1μm in size. Possible mechanisms of such unusual eclipses are discussed. We draw an analogy between these eclipses and the cycles of photometric activity observed in UX Ori stars. Light curves similar to those observed for H 187 are shown to be obtained in the model of a young binary system with a low-mass companion accreting matter from the remnants of a protostellar cloud at a rate of ˜10-9 M &sun; yr-1.
Barsunova Yu. O.
Demidova T. V.
Grinin V. P.
Sergeev Sergey G.
Sotnikova Natalia Ya.
No associations
LandOfFree
On the nature of the unique eclipsing system H 187 (HMW 15) 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 On the nature of the unique eclipsing system H 187 (HMW 15), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the nature of the unique eclipsing system H 187 (HMW 15) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1241829