Worldwide photometry of the January 1989 Tau Persei eclipse Academic Article uri icon


  • We present new UBV photoelectric photometry of Persei obtained at 19 different observatories during its recent January 1989 eclipse. Mideclipse occurred at JD 2 447 542.31 0d.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% total at mideclipse and the ratio of the radii is 0.135 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 1m.72 in V and the color excess in B - V is 0m.06, both quantities consistent (within uncertainties) with earlier estimates of Ake. The eclipse duration, from first to fourth contact, is 2d.09. The orbital inclination is 88.74, consistent with what McAlister derived from speckle interferometry. Because of the large (e = 0.73) eccentricity, there is no secondary eclipse at all.

published proceedings

  • The Astronomical Journal

author list (cited authors)

  • Hall, D. S., Barksdale, W. S., Curott, D. R., Diethelm-Sutter, R., Ells, J., Frey, G. J., ... Williams, D. B.

citation count

  • 3

complete list of authors

  • Hall, Douglas S||Barksdale, William S||Curott, David R||Diethelm-Sutter, Roger||Ells, Jack||Frey, Gary J||Houchen, Michael B||Krisciunas, Kevin||Leiker, P Steven||Lines, Helen C||Lines, Richard D||Miles, Richard||Milton, Russell E||Ohshima, Osamu||Powell, Harry D||Pasour, John L||Schroder, Klaus-Peter||Slauson, Douglas M||Smith, Diane Pyper||Snyder, Leroy F||Williams, David B

publication date

  • May 1991