Classical nova V339 Del (Nova Del 2013) - a short review

Abstract

Multifrequency observations of the classical CO nova V339 Del, detected in all frequencies from γ-rays to radio, are reviewed. Nova V339 Del was discovered on 2013 August 14.584 UT. The times of decline from the brightness maximum V = 4.4 mag, reached on 2013 August 16.47, UT, was estimated as t 2,V = 10 days, t 3,V = 18 days, so V339 Del can be classified as a fast nova with super-Eddington luminosity at maximum. The maximum-magnitude-rate-of-decline relations were used to determine an absolute magnitude at maximum M V,max = −8.70± 0.03, M B,max = -8.45 ±0.08 and distance d = 3.2±0.3 kpc, using the interstellar extinction E(B −V ) = 0.184±0.035. The distance to the nova found by different methods is in the range 2.7 -4.54 kpc. The white dwarf mass was estimated from M B,max as M wd = 1.04±0.02 M ⊙ . We suggest that the eruption occurred on the surface of a CO white dwarf. V339 Del is the first nova that has been observed to synthesize the element lithium. The dust consisted of amorphous carbon grains was detected in infrared region. The UBV R C I C light curves of nova constructed from daily means of all available data, including our own observations obtained from its discovery till August 2015, are presented and used to show the track of the nova in the color-color diagram during the first 100 days. The dust particles formed in the dense clumps of ejecta were responsible for the U light curve variability. Our medium-resolution spectrum of V339 Del taken in August 2015 by the 6m SAO telescope in North Caucasus confirms a non-spherical structure of the ejected shell.

Multiwavelength Modeling of the SED of Nova V339 Del: Stopping the Wind and Long-lasting Super-Eddington Luminosity with Dust Emission

“…As a result, a large amount of observations with a high cadence in the optical, has 1 E-mail: skopal@ta3.sk 2 http://www.aavso.org/apass been performed from γ-rays (Ackermann et al 2014;Ahnen et al 2015) to the radio/mm-2 cm wavelengths Anderson et al 2013). A short review of V339 Del was presented by Munari et al (2015), Shore et al (2016), Evans et al (2017) and Chochol et al (2017). Figure 1 shows the optical light curve (LC) of the nova from day ∼1 after its explosion (see below) to day ∼1800.…”

Multiwavelength models SED of the classical nova V339 Del (Nova Del 2013) along its age

“…A short review of V339 Del was presented by [12], [8] and [4]. In this contribution we present the SED in the optical to near-IR of the nova throughout its main stages of evolution: The fireball stage, transition to a harder spectrum, super-soft source phase and in the nebular phase.…”