A Planetary Nebula around Nova V458 Vulpeculae Undergoing Flash Ionization

Nova V458 Vul erupted on 2007 August 8 and reached a visual magnitude of 8.1 a few days later. Ha images obtained 6 weeks before the outburst as part of the IPHAS Galactic plane survey reveal an 18th magnitude progenitor surrounded by an extended nebula. Subsequent images and spectroscopy of the nebula reveal an inner nebular knot increasing rapidly in brightness due to flash ionization by the nova event. We derive a distance of 13 kpc based on light travel time considerations, which is supported by two other distance estimation methods. The nebula has an ionized mass of 0.2 Msolar and a low expansion velocity: this rules it out as ejecta from a previous nova eruption, and is consistent with it being a ~14,000 year old planetary nebula, probably the product of a prior common envelope (CE) phase of evolution of the binary system. The large derived distance means that the mass of the erupting WD component of the binary is high. We identify two possible evolutionary scenarios, in at least one of which the system is massive enough to produce a Type Ia supernova upon merging.

York; Shadows in Siberia According to Kapuscinski

Two poems

New York City: 12 December, 1980

This article compares two documentary treatments of the Central Park vigil for John Lennon in 1980: Happy Birthday to John (Jonas Mekas, 1995, 16mm, 18 min.), and Dix minutes de silence pour John Lennon/Ten Minutes Silence for John Lennon (Raymond Depardon, 1980, 16mm, 10 min.). Mekas and Depardon might seem an improbable combination but as the article demonstrates there are affinities, if not direct points of convergence, in outlook and documentary method: both sensibilities have been shaped by migrant experiences, and much of their work, for all its formal and structural differences, is preoccupied with experiences of exile and displacement, rootedness and the meaning of home, the country and the city (and in Mekas’s case, the country in the city). Mekas and Depardon are also Europeans who have developed an intimate social and artistic relationship with New York City; both are concerned with the place of autobiography in their work, using captions, inter-titles, diary entries, photographs, and 1st person commentary to complicate relations between the imaginary and the documentary. In addition to discussing the significance of these preoccupations, and differences in the manner in which both filmmakers witness the apotheosis of Lennon as cultural martyr (and natural New Yorker), the article also examines the phenomenon of public mourning, and how it often displaces its ostensible subject: associatively, in the case of Mekas; incidentally, in the case of Depardon; and intentionally, in the case of the mass media, and popular culture.

Classical novae from the POINT-AGAPE microlensing survey of M31 - II. Rate and statistical characteristics of the nova population

The POINT-AGAPE (Pixel-lensing Observations with the Isaac Newton Telescope-Andromeda Galaxy Amplified Pixels Experiment) survey is an optical search for gravitational microlensing events towards the Andromeda galaxy (M31). As well as microlensing, the survey is sensitive to many different classes of variable stars and transients. In our first paper of this series, we reported the detection of 20 classical novae (CNe) observed in Sloan r' and i' passbands.

Classical novae from the POINT-AGAPE microlensing survey of M31 - I. The nova catalogue

The POINT-AGAPE (Pixel-lensing Observations with the Isaac Newton Telescope-Andromeda Galaxy Amplified Pixels Experiment) survey is an optical search for gravitational microlensing events towards the Andromeda galaxy (M31). As well as microlensing, the survey is sensitive to many different classes of variable stars and transients. Here we describe the automated detection and selection pipeline used to identify M31 classical novae (CNe) and we present the resulting catalogue of 20 CN candidates observed over three seasons. CNe are observed both in the bulge region as well as over a wide area of the M31 disc. Nine of the CNe are caught during the final rise phase and all are well sampled in at least two colours. The excellent light-curve coverage has allowed us to detect and classify CNe over a wide range of speed class, from very fast to very slow. Among the light curves is a moderately fast CN exhibiting entry into a deep transition minimum, followed by its final decline. We have also observed in detail a very slow CN which faded by only 0.01 mag d(-1) over a 150-d period. We detect other interesting variable objects, including one of the longest period and most luminous Mira variables. The CN catalogue constitutes a uniquely well-sampled and objectively-selected data set with which to study the statistical properties of CNe in M31, such as the global nova rate, the reliability of novae as standard-candle distance indicators and the dependence of the nova population on stellar environment. The findings of this statistical study will be reported in a follow-up paper.