On the Possibility of V4444 Sgr as a Recurrent Nova
نویسندگان
چکیده
V4444 Sgr (Nova Sgr 1999) has been recently suggested to be a possible recurrent nova based on the detection of the preexisting dust, which may have been formed in a previous outburst. We examined this possibility using the available outburst observations, including the VSNET observations. We also noticed that this nova was recorded in the OGLE II public photometric database, which covered both preoutburst and late decline phases. The outburst light curve constructed from these observations showed a plateau phase, particularly in the OGLE II I-band light curve, which was followed by a more rapid decline. The light curve resembled those of “fast” recurrent novae and candidates in the presence of the distinct plateau phase. The outburst spectrum and the preoutburst magnitude more resembled those of classical novae, but they do not exclude the possibility of a recurrent nova.
منابع مشابه
Looking for Dust and Molecules in Nova V 4743 Sagittarii ⋆
We present 1.2 mm continuum images and spectral line observations of CO(1–0) and SiO(3–2) rotational transitions of the recent nova V4743 Sgr. The nova is detected at 1.2 mm showing a variable millimetre emission. Only upper limits of T ⋆ A = 0.06 K for CO and T ⋆ A = 0.03 K for SiO could be derived. We discuss the results in terms the nature of the millimetre emission favouring dust from a pha...
متن کاملRecurrent Novae , Classical Novae , Symbiotic Novae , and Population II
Light curve analysis of decay phase of nova outburst are summarized. Nova duration is determined by the strong wind mass-loss which depends only on the white dwarf mass. Fast novae correspond very massive white dwarfs and very slow novae correspond almost lower mass limit of white dwarfs. This relation is shown in both of classical novae and recurrent novae. Light curves are theoretically repro...
متن کاملSgr – a probable second asynchronous polar classical nova
Photometric observations of V4633 Sgr (Nova Sagittarii 1998) during 1998-2005 reveal the presence of a stable photometric periodicity at P1 = 180.8 min which is probably the orbital period of the underlying binary system. A second period was present in the light curve of the object for six years. Shortly after the nova eruption it was measured as P2 = 185.6 min. It has decreased monotonically i...
متن کاملRemarkable changes in the near-infrared spectrum of the nova-like variable V4332 Sgr
We report on recent near-IR observations of V4332 Sgr the nova-like variable that erupted in 1994. Its rapid, post-outburst evolution to a cool M type giant/supergiant, soon after its outburst, had showed that it was an unusual object differing from other eruptive variables like classical/symbiotic novae or born-again AGB stars. The present study of V4332 Sgr was motivated by the keen interest ...
متن کاملX-ray Observations of Classical and Recurrent Novae in Outburst
I review X-ray observations of classical and recurrent novae in outburst, some of them recently done with Chandra and XMM-Newton for 12 objects. Significant X-ray flux is emitted by the nova shell, with a peak luminosity up to Lx=10 35 erg s in the 0.2-10 keV range. In recurrent nova systems, or in novae hosting a red giant, the source of X-rays may be previous circumstellar matter shocked by t...
متن کامل