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

V. P. Grinin, O. Yu Barsunova, S. G. Sergeev, N. Ya Sotnikova, T. V. Demidova

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

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 Ȯ yr-1.

Original languageEnglish
Pages (from-to)827-831
Number of pages5
JournalAstronomy Letters
Volume32
Issue number12
DOIs
StatePublished - 1 Dec 2006
Externally publishedYes

Keywords

  • Accretion
  • Photometry
  • UX Ori stars
  • Young eclipsing systems

Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Grinin, V. P. ; Barsunova, O. Yu ; Sergeev, S. G. ; Sotnikova, N. Ya ; Demidova, T. V. / On the nature of the unique eclipsing system H 187 (HMW 15). In: Astronomy Letters. 2006 ; Vol. 32, No. 12. pp. 827-831.
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On the nature of the unique eclipsing system H 187 (HMW 15). / Grinin, V. P.; Barsunova, O. Yu; Sergeev, S. G.; Sotnikova, N. Ya; Demidova, T. V.

In: Astronomy Letters, Vol. 32, No. 12, 01.12.2006, p. 827-831.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Demidova, T. V.

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