The X-ray emission from Nova V382 Velorum - I. the hard component observed with BeppoSAX

M. Orio, A. Parmar, R. Benjamin, L. Amati, F. Frontera, J. Greiner, H. Ögelman, T. Mineo, Sumner Starrfield, E. Trussoni

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

We present BeppoSAX observations of Nova Velorum 1999 (V382 Vel), carried out in a broad X-ray band covering 0.1-300 keV only 15 d after the discovery and again after 6 months. The nova was detected at day 15 with the BeppoSAX instruments which measured a flux Fx ≃ 1.8 × 10-11 erg cm-2s-1 in the 0.1-10 keV range and a 2σ upper limit Fx < 6.7 × 10-12erg cm-2s-1 in the 15-60 keV range. We attribute the emission to shocked nebular ejecta at a plasma temperature kT ≃ 6 keV. At six months no bright component emerged in the 15-60 keV range, but a bright central supersoft X-ray source appeared. The hot nebular component previously detected had cooled to a plasma temperature kT < 1 keV. There was strong intrinsic absorption of the ejecta in the first observation and not in the second, because the column density of neutral hydrogen decreased from N(H) ≃ 1.7 × 1023 to N(H) ≃ 1021cm-2 (close to the interstellar value). The unabsorbed X-ray flux also decreased from Fx = 4.3 × 10-11 to Fx ≃ 10-12 erg cm-2s-1.

Original languageEnglish (US)
Pages (from-to)L13-L18
JournalMonthly Notices of the Royal Astronomical Society
Volume326
Issue number2
DOIs
StatePublished - Sep 11 2001

Keywords

  • Novae, cataclysmic variables
  • Stars: individual: V382 Vel
  • X-rays: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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