The History of the Mysterious Eclipses of KH 15D: Asiago Observatory, 1967-1982

Details The History of the Mysterious Eclipses of KH 15D: Asiago Observatory, 1967-1982 The History of the Mysterious Eclipses of KH 15D: Asiago Observatory, 1967-1982

2003-12-17

arxiv.org/abs/astro-ph/0312428v2

Astronomy and Astrophysics

Astrophysics

Accepted to AJ. 24 pages, 10 figures, 2 tables. v2: Phase error corrected in figures 8 and 10

Scientific paper

10.1086/382520

We are gathering archival observations to determine the photometric history of the unique and unexplained eclipses of the pre-main-sequence star KH 15D. Here we present a light curve from 1967-1982, based on photographic plates from Asiago Observatory. During this time, the system alternated periodically between bright and faint states, as observed today. However, the bright state was 0.9 mag brighter than the modern value, and the fractional variation between bright and faint states (Delta I = 0.7 mag) was smaller than observed today (3.5 mag). A possible explanation for these findings is that the system contains a second star that was previously blended with the eclipsing star, but is now completely obscured.

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