A Study of the Eclipsing Cataclysmic Variable Lanning 90

As of this writing, permission to reproduce published American Astronomical Society (AAS) poster papers or papers published in American Institute of Physics (AIP) journals is restricted. The AIP Copyright attorney has interpreted the reproduction of published works on the WWW as a distribution rather than a republication in violation of existing copyright agreements. Therefore, the text of the Lanning 90 paper cannot be provided at this time.

However, quotations of segments of papers are allowed with the permission of the author or the journal. Therefore, with the permission of the author, the following basic data on Lanning 90 is presented:

Lanning 90 (V1776 Cyg)...

1. Photometric Elements:
   • Period: 3h57m
   • Ephemeris: HJD = 2447048.7925 +/- 0.0007+E*0.16473857 +/- 0.00000025

   Two Photometric Light Curves Exhibiting Variations of Features

   

   Fig. 2: Lanning 90 Eclipse Light Curve from October 13, 1986

   

   Fig. 6: Lanning 90 Eclipse Light Curve from October 30, 1987

2. Spectroscopic Orbital Elements:
   • K = 144 +/- 20 km/sec
   • gamma = -12 +/- 28 km/sec
   • phi(0) = 0.19 +/- 0.04 (phase shift between photometric phase and radial velocity phase)
   • M(1) = 0.6 M(sun)
   • M(2) = 0.37M(sun)
   • i = 75 deg
   • R(2) = 0.42 R(sun)
   • a = 1.24 R(sun)

   
   

   Fig. 12: Lanning 90 Spectroscopic Velocity Curve

UV Survey Intro Page