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Title: THE DWARF NOVA OUTBURSTS OF NOVA HER 1960 (=V446 HER)

V446 Her is the best example of an old nova which has developed dwarf nova (DN) eruptions in the post-nova state. We report on observed properties of the long-term light curve of V446 Her, using photometry over 19 years. Yearly averages of the outburst (OB) magnitudes show a decline of {approx}0.013 mag yr{sup -1}, consistent with the decline of other post-novae that do not have DN OBs. Previous suggestions of bimodal distributions of the amplitudes and widths of the OBs are confirmed. The OBs occur at a mean spacing of 18 days but the range of spacings is large (13-30 days). From simulations of DN OBs, it has been predicted that the OB spacing in V446 Her will increase as M-dot from the red dwarf companion slowly falls following the nova; however, the large intrinsic scatter in the spacings serves to hide any evidence of this effect. We do find a systematic change in the OB pattern in which the brighter, wider type of OBs disappeared after late 2003, and this phenomenon is suggested to be due to falling M-dot following the nova.
Authors:
 [1] ;  [2] ;  [3]
  1. Astronomy Department, Indiana University, Swain Hall West, Bloomington, IN 47405 (United States)
  2. Department of Physical Sciences, Arkansas Tech University, 1701 N. Boulder Ave., Russellville, AR 72801-2222 (United States)
  3. Department of Terrestrial Magnetism, Carnegie Institute of Washington, 5241 Broad Branch Road NW, Washington, DC 2001 (United States)
Publication Date:
OSTI Identifier:
21583175
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 141; Journal Issue: 4; Other Information: DOI: 10.1088/0004-6256/141/4/121
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ERUPTION; NOVAE; PHOTOMETRY; SIMULATION; VISIBLE RADIATION BINARY STARS; ELECTROMAGNETIC RADIATION; ERUPTIVE VARIABLE STARS; RADIATIONS; STARS; VARIABLE STARS