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24 April 2024 |
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Multiwavelength Photometry and Hubble Space Telescope Spectroscopy of the Old Nova V842 Centaurus | | Edward M. Sion
; Paula Szkody
; Anjum Mukadam
; Brian Warner
; Patrick Woudt
; Frederic Walter
; Arne Henden
; Patrick Godon
; | | Date: |
20 May 2013 | | Abstract: | We present ground-based optical and near infrared photometric observations
and Hubble Space Telescope COS spectroscopic observations of the old nova V842
Cen (Nova Cen 1986). Analysis of the optical light curves reveals a peak at
56.5 +/- 0.3s with an amplitude of 8.9 +/- 4.2 mma, which is consistent with
the rotation of a magnetic white dwarf primary in V842 Cen that was detected
earlier by Woudt et al., and led to its classification as an intermediate
polar.However, our UV lightcurve created from the COS time-tag spectra does not
show this periodicity. Our synthetic spectral analysis of an HST COS spectrum
rules out a hot white dwarf photosphere as the source of the FUV flux. The
best-fitting model to the COS spectrum is a full optically thick accretion disk
with no magnetic truncation, a low disk inclination angle, low accretion rate
and a distance less than half the published distance that was determined on the
basis of interstellar sodium D line strengths.Truncated accretion disks with
truncation radii of 3Rwd and 5Rwd yielded unsatisfactory agreement with the COS
data. The accretion rate is unexpectedly low for a classical nova only 24 years
after the explosion when the accretion rate is expected to be high and the
white dwarf should still be very hot, especially if irradiation of the donor
star took place. Our low accretion rate is consistent with low accretion rates
derived from X-ray and ground-based optical data. | | Source: | arXiv, 1305.4564 | | Services: | Forum | Review | PDF | Favorites | |
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