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Title: HUBBLE SPACE TELESCOPE FAR ULTRAVIOLET SPECTROSCOPY OF THE RECURRENT NOVA T PYXIDIS

With six recorded nova outbursts, the prototypical recurrent nova T Pyxidis (T Pyx) is the ideal cataclysmic variable system to assess the net change of the white dwarf mass within a nova cycle. Recent estimates of the mass ejected in the 2011 outburst ranged from a few ∼10{sup –5} M {sub ☉} to 3.3 × 10{sup –4} M {sub ☉}, and assuming a mass accretion rate of 10{sup –8}-10{sup –7} M {sub ☉} yr{sup –1} for 44 yr, it has been concluded that the white dwarf in T Pyx is actually losing mass. Using NLTE disk modeling spectra to fit our recently obtained Hubble Space Telescope COS and STIS spectra, we find a mass accretion rate of up to two orders of magnitude larger than previously estimated. Our larger mass accretion rate is due mainly to the newly derived distance of T Pyx (4.8 kpc, larger than the previous 3.5 kpc estimate), our derived reddening of E(B – V) = 0.35 (based on combined IUE and GALEX spectra), and NLTE disk modeling (compared to blackbody and raw flux estimates in earlier works). We find that for most values of the reddening (0.25 ≤ E(B – V) ≤ 0.50) and white dwarf mass (0.70 Mmore » {sub ☉} ≤ M {sub wd} ≤ 1.35 M {sub ☉}) the accreted mass is larger than the ejected mass. Only for a low reddening (∼0.25 and smaller) combined with a large white dwarf mass (0.9 M {sub ☉} and larger) is the ejected mass larger than the accreted one. However, the best results are obtained for a larger value of reddening.« less
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6]
  1. Astronomy and Astrophysics, Villanova University, Villanova, PA 19085 (United States)
  2. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287 (United States)
  3. Space Telescope Science Institute, Baltimore, MD 21218 (United States)
  4. Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN 55455 (United States)
  5. Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT (United Kingdom)
  6. Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH (United Kingdom)
Publication Date:
OSTI Identifier:
22365928
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 784; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DISTANCE; EMISSION SPECTRA; FAR ULTRAVIOLET RADIATION; MASS; NOVAE; SPACE; TELESCOPES; WHITE DWARF STARS