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Title:
The History of the Mysterious Eclipses of KH 15D. II. Asiago, Kiso, Kitt Peak, Mount Wilson, Palomar, Tautenburg, and Rozhen Observatories, 1954-1997
Authors:
Johnson, John Asher; Winn, Joshua N.; Rampazzi, Francesca; Barbieri, Cesare; Mito, Hiroyuki; Tarusawa, Ken-ichi; Tsvetkov, Milcho; Borisova, Ana; Meusinger, Helmut
Affiliation:
AA(Department of Astronomy, University of California, Mail Code 3411, Berkeley, CA 94720.), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.; Hubble Fellow.), AC(Department of Astronomy, University of Padova, Vicolo Osservatorio 2, 35122 Padua, Italy.), AD(Department of Astronomy, University of Padova, Vicolo Osservatorio 2, 35122 Padua, Italy.), AE(Kiso Observatory, Institute of Astronomy, School of Science, University of Tokyo, Mitake-mura, Kiso-gun, Nagano-ken 397-0101, Japan.), AF(Kiso Observatory, Institute of Astronomy, School of Science, University of Tokyo, Mitake-mura, Kiso-gun, Nagano-ken 397-0101, Japan.), AG(Institute of Astronomy, Bulgarian Academy of Sciences, Tsarigradsko Shosse Boulevard 72, Sofia 1784, Bulgaria.; Space Research Institute, Bulgarian Academy of Sciences, Moskovska Strasse 6, Sofia 1000, Bulgaria.), AH(Space Research Institute, Bulgarian Academy of Sciences, Moskovska Strasse 6, Sofia 1000, Bulgaria.), AI(Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany.)
Publication:
The Astronomical Journal, Volume 129, Issue 4, pp. 1978-1984. (AJ Homepage)
Publication Date:
04/2005
Origin:
UCP
AJ Keywords:
Stars: Circumstellar Matter, Stars: Individual: Alphanumeric: KH 15D, Stars: Pre-Main-Sequence, Techniques: Photometric
DOI:
10.1086/428597
Bibliographic Code:
2005AJ....129.1978J

Abstract

The unusual pre-main-sequence binary star KH 15D undergoes remarkably deep and long-lasting periodic eclipses. Some clues about the reason for these eclipses have come from the observed evolution of the system's light curve over the last century. Here we present UBVRI photometry of KH 15D from 1954 to 1997 based on photographic plates from various observatories. The system has been variable at the ~1 mag level since at least 1965. There is no evidence of color variations, with a typical limit of Δ(B-V)<0.2 mag. We confirm some previously published results that were based on a smaller sample of plates: from approximately 1965 to 1990, the total flux was modulated with the 48 day orbital period of the binary, but the maximum flux was larger, the fractional variations were smaller, and the phase of minimum flux was shifted by almost a half-cycle relative to the modern light curve. All these results are consistent with the recently proposed theory that KH 15D is being occulted by an inclined, precessing, circumbinary ring.

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