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25 April 2024

» arxiv » astro-ph/0208203

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Fine Structure in the Circumstellar Environment of a Young, Solar-like Star: the Unique Eclipses of KH 15D
William Herbst ; Catrina M. Hamilton ; Frederick J. Vrba ; Mansur A. Ibrahimov ; Coryn A.L. Bailer-Jones ; Reinhard Mundt ; Markus Lamm ; Tsevi Mazeh ; Zodiac T. Webster ; Karl E. Haisch ; Eric C. Williams ; Andrew H. Rhodes ; Thomas J. Balonek ; Alexander Scholz ; Arno Riffeser ;
Date:	9 Aug 2002
Subject:	astro-ph
Abstract:	Results of an international campaign to photometrically monitor the unique pre-main sequence eclipsing object KH 15D are reported. An updated ephemeris for the eclipse is derived that incorporates a slightly revised period of 48.36 d. There is some evidence that the orbital period is actually twice that value, with two eclipses occurring per cycle. The extraordinary depth (~3.5 mag) and duration (~18 days) of the eclipse indicate that it is caused by circumstellar matter, presumably the inner portion of a disk. The eclipse has continued to lengthen with time and the central brightness reversals are not as extreme as they once were. V-R and V-I colors indicate that the system is slightly bluer near minimum light. Ingress and egress are remarkably well modeled by the passage of a knife-edge across a limb-darkened star. Possible models for the system are briefly discussed.
Source:	arXiv, astro-ph/0208203
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