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HFG1: A Planetary Nebula with a Close-Binary Nucleus

Published online by Cambridge University Press:  19 July 2016

Howard E. Bond ,
Robin Ciardullo ,
Thomas A. Fleming  and
Albert D. Grauer
Howard E. Bond
Affiliation:
Space Telescope Science Institute
Robin Ciardullo
Affiliation:
Dept. of Terrestrial Magnetism, Carnegie Institution of Wash
Thomas A. Fleming
Affiliation:
Steward Observatory, University of Arizona
Albert D. Grauer
Affiliation:
University of Arkansas, Little Rock

Abstract

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HFG1 (136+5°1) is a large, low-surface-brightness planetary nebula that was discovered by Heckathorn, Fesen, and Gull (Astrpn. Astronphys., 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.

Type
III. Central Stars
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 310
Copyright
Copyright © Kluwer 1989