Ginga observations of the dwarf novae BV Pup and V426 Oph

Journal Article · Wed Aug 01 04:00:00 EDT 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115536· OSTI ID:6551177

Szkody, P; Kii, T; Osaki, Y ^[1]

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1. Washington Univ., Seattle (USA) Institute of Space and Astronautical Science, Sagamihara (Japan) Tokyo Univ. (Japan)

Ginga X-ray observations of the high excitation dwarf nova BV Pup and the suspected DQ Her dwarf nova V426 Oph are presented. The observation of BV Pup took place during optical quiescence and showed no detectable X-ray flux, implying the X-ray luminosity was below that observed by Exosat during the decline from an outburst. An optical spectrum obtained near the time of the X-ray observations showed no high-excitation He II 4686, so that it is not clear if this was an unusual low-excitation time for BV Pup or if this is a normal phase of the outburst cycle. V426 Oph was observed for four days near maximum outburst brightness with overlapping X-ray coverage on three days. The 2-10 keV flux was a factor of 2 below that observed by Exosat during a quiescent state. There is evidence for a 28 min timescale in the X-ray, and optical data which are not strictly periodic in nature. 24 refs.

• OSTI ID: 6551177
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 100; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCRETION DISKS
ASIA
BINARY STARS
DWARF STARS
ELECTROMAGNETIC RADIATION
ERUPTIVE VARIABLE STARS
HEATING
IONIZING RADIATIONS
JAPAN
LUMINOSITY
MAGNETIC STARS
MASS TRANSFER
NOVAE
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATION FLUX
RADIATIONS
SATELLITES
SPECTRA
STARS
VARIABLE STARS
VISIBLE SPECTRA
WHITE DWARF STARS
X RADIATION