NDLI: On the nature of the unique eclipsing system H 187 (HMW 15)

Content Provider	Springer Nature Link
Author	Grinin, V. P. Barsuva, O. Yu. Sergeev, S. G. Sotnikova, N. Ya. Demidova, T. V.
Copyright Year	2006
Abstract	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 $_{⊙}$ yr$^{−1}$.
Starting Page	827
Ending Page	831
Page Count	5
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	32
Issue Number	12
e-ISSN	15626873
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2006-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	young eclipsing systems photometry accretion UX Ori stars Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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