Multiwavelength Superoutburst Observations of T Leonis

Details Multiwavelength Superoutburst Observations of T Leonis Multiwavelength Superoutburst Observations of T Leonis

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasp..111..342h&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 757, pp. 342-355.

Astronomy and Astrophysics

Astronomy

19

Infrared Radiation, Stars: Novae, Cataclysmic Variables, Stars: Individual: Constellation Name: T Leonis, Stars: Individual: Constellation Name: Sw Ursae Majoris, Stars: Individual: Constellation Name: Bc Ursae Majoris, Stars: Individual: Constellation Name: Tv Corvi, Stars: Individual: Constellation Name: Ss Cygni, Stars: Individual: Constellation Name: U Geminorum, Stars: Individual: Constellation Name: Vw Hydri, Ultraviolet Emission, X-Rays

Scientific paper

We present results of simultaneous superoutburst observations in the X-ray, EUV, optical, and IR bands of the tremendous outburst amplitude dwarf novae T Leonis. Near peak luminosity, a single blackbody represents a good fit to T Leo's observed continuum in the EUV spectral region, yielding a boundary layer temperature of 71,000-97,000 K. Inclusion of the longer wavelength observations, UV to the IR, indicates that a blackbody fit is inappropriate. A single-temperature fit to only the UV and redward data for T Leo works well but yields a much lower temperature, near 28,000 K. Using our own observations and previously obtained EUV, UV, and optical (super)outburst observations for the dwarf novae U Gem and SS Cyg, the SU UMa star VW Hyi, and the TOADs, TV Crv, BC UMa, and SW UMa, we find that in all cases, high-energy observations yield high-temperature, small emitting regions, while fits to UV and redward data produce cooler temperatures from much larger emitting regions. These results are consistent with the idea that high-energy data provide a direct measurement of the boundary layer, while the lower energy data measure a much larger, multitemperature region, likely to be dominated by the outburst heated inner accretion disk. High-energy outburst observations show that the boundary layer temperature decreases with decreasing orbital period, and UV outburst observations provide evidence for a missing or weak inner disk in the TOADs. We present a simple model of mass accretion onto the white dwarf during (super)outburst, which can account for the observed correlation between orbital period and boundary layer temperature.

Affiliated with

Also associated with

No associations

Rating

Multiwavelength Superoutburst Observations of T Leonis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Multiwavelength Superoutburst Observations of T Leonis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiwavelength Superoutburst Observations of T Leonis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-846160