HFG1: A Planetary Nebula with a Close-Binary Nucleus

  • Howard E. Bond
  • Robin Ciardullo
  • Thomas A. Fleming
  • Albert D. Grauer
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 131)


HFG1 (136+5°1) is a large, low-surface-brightness planetary nebula that was discovered by Heckathorn, Fesen, and Gull (Astron. Astrophys., 114, 414, 1982). In the autumn of 1986, photoelectric photometry by A.D.G. and H.E.B. showed that the 14th-mag central star of HFG1 is a large-amplitude variable. Subsequent CCD photometry by R.C. and H.E.B. reveals a sinusoidal variation with a period of 13.96 hr and an amplitude of 1.1 mag in the B band.


Emission Line Central Star Planetary Nebula Companion Star Carnegie Institution 
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Copyright information

© International Astronomical Union 1989

Authors and Affiliations

  • Howard E. Bond
    • 1
  • Robin Ciardullo
    • 2
  • Thomas A. Fleming
    • 3
  • Albert D. Grauer
    • 4
  1. 1.Space Telescope Science InstituteUSA
  2. 2.Dept. of Terrestrial MagnetismCarnegie Institution of Wash.USA
  3. 3.Steward ObservatoryUniversity of ArizonaUSA
  4. 4.University of ArkansasLittle RockUSA

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