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Worldwide photometry of the January 1989 Tau Persei eclipseNew UBV photoelectric photometry of Tau Persei obtained at 19 different observatories during its recent January 1989 eclipse is presented. Mideclipse occurred at JD 2 447 542.31 + or - 0.01. The resulting light curve, though not complete at all phases, is solved for the elements with the help of two quantities derived from spectroscopy: the eclipse is 84 percent total at mideclipse, and the ratio of the radii is 0.135 + or - 0.01. Radii relative to the semimajor axis are 0.0236 for the G5 giant and 0.0032 for the A2 star. With a reasonable total mass assumed, the absolute radii say the A2 star could be luminosity class V or somewhat evolved and the G5 star is between III and II but could be closer to II. The G5 giant is brighter than the A2 star by 1.72 mag in V and the color excess in B - V is 0.06 mag, both quantities consistent (within uncertainties) with earlier estimates of Ake (1986). The eclipse duration, from first to fourth contact, is 2.09 day. The orbital inclination is 88.74 deg, consistent with what McAlister derived from speckle interferometry. Because of the large (e = 0.73) eccentricity, there is no secondary eclipse at all.
Document ID
19910050274
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hall, Douglas S.
(Tennessee State University Nashville, United States)
Curott, David R.
(North Alabama, University Florence, AL, United States)
Barksdale, William S.
(Tennessee State Univ. Nashville, TN, United States)
Diethelm-Sutter, Roger
(Tennessee State Univ. Nashville, TN, United States)
Ells, Jack
(Tennessee State Univ. Nashville, TN, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1991
Publication Information
Publication: Astronomical Journal
Volume: 101
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
91A34897
Funding Number(s)
CONTRACT_GRANT: NAG8-111
Distribution Limits
Public
Copyright
Other

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