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Metallicity and effective temperature of the secondary of RS Oph | Ya.V.Pavlenko
; A.Evans
; T.Kerr
; L.Yakovina
; C.E.Woodward
; D.Lynch
; R.Rudy
; R.L.Pearson
; R.W.Russell
; | Date: |
21 Apr 2008 | Abstract: | The recurrent nova RS Oph undergoes nova eruptions every ~ 10-20years as a
result of thermonuclear runaway on the surface of a white dwarf close to the
Chandrasekhar limit. Both the progress of the eruption, and its aftermath,
depend on the (poorly known) composition of the red giant in the RS Oph system.
Our aim is to understand better the effect of the giant secondary on the
recurrent nova eruption. Synthetic spectra were computed for a grid of M-giant
model atmospheres having a range of effective temperatures 3200 < Teff < 4400
K, gravities 0 < log g < 1 and abundances -4 <[Fe/H] < 0.5, and fit to infrared
spectra of RS Oph as it returned to quiescence after its 2006 eruption. We have
modelled the infrared spectrum in the range 1.4-2.5 micron to determine
metallicity and effective temperature of the red giant. We find Teff = 4100 +/-
100 K, log g = 0.0 +/- 0.5, [Fe/H] = 0.0 +/- 0.5, [C/H] = -0.8 +/- 0.2, [N/H] =
+0.6 +/- 0.3 in the atmosphere of the secondary, and demonstrate that that
inclusion of some dust ’veiling’ in the spectra cannot improve our fits. | Source: | arXiv, 0804.3316 | Services: | Forum | Review | PDF | Favorites |
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