Suchergebnisse

The parallax expansion and kinematics of a nova shell can be used to assess its age and distance, and to investigate the interaction of the ejecta with the circumstellar medium. These are key to understand the expansion and dispersal of the nova ejecta in the Galaxy. Multi-epoch images and high-dispersion spectroscopic observations of the recently discovered classical nova shell IPHASX J210204.7 + 471015 around a nova-like system have been used to derive a present-day expansion rate of 0 ''. 100 yr(-1) and an expansion velocity of 285 km s(-1). These data are combined to obtain a distance of 600 pc to the nova. The secular expansion of the nova shell place the event sometime between 1850 and 1890, yet it seems to have been missed at that time. Despite its young age, 130-170 yr, we found indications that the ejecta has already experienced a noticeable deceleration, indicating the interaction of this young nova shell with the surrounding medium.© 2019 The Author(s).Published by Oxford University Press on behalf of the Royal Astronomical Society ; ES acknowledges support from Universidad de Guadalajara and Consejo Nacional de Ciencia y Tecnologia (CONACyT). MAG acknowledges support of the grant AYA2014-57280-P, cofunded with Fondo Europeo para el Desarrollo Regional (FEDER) funds. GR-L acknowledges support from Fundacion Marcos Moshinsky, CONACyT, and Programa para el Desarrollo Profesional Docente (PRODEP) (Mexico). LS acknowledges support from Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT) grant IA-101316 (Mexico). JAT and MAG are funded by Universidad Nacional Autonoma de Mexico (UNAM), Direccion General de Asuntos del Personal Academico (DGAPA) PAPIIT project IA100318. We thank Martin Henze for his advise on historical records of novae and photographic plates. This paper also makes use of data obtained as part of the INT Photometric H alpha Survey of the Northern Galactic Plane (IPHAS: http://www.iphas.org) carried out at the Isaac Newton Telescope (INT). The INT is operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio delRoque de los Muchachos of the Instituto de Astrofisica de Canarias. All IPHAS data are processed by the Cambridge Astronomical Survey Unit at the Institute of Astronomy in Cambridge. The band-merged DR2 catalogue was assembled at the Centre for Astrophysics Research, University of Hertfordshire, supported by STFC grant ST/J001333/1. The Digitized Sky Surveys were produced at the Space Telescope Science Institute (STScI) under US Government grant NAGW-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions. The National Geographic Society-Palomar Observatory Sky Atlas (POSS-I) was made by the California Institute of Technology with grants from the National Geographic Society. The second Palomar Observatory Sky Atlas (POSS-II) was made by the California Institute of Technology with funds from the National Science Foundation, the National Geographic Society, the Sloan Foundation, the Samuel Oschin Foundation, and the Eastman Kodak Corporation. The Oschin Schmidt Telescope is operated by the California Institute of Technology and Palomar Observatory. The UK Schmidt Telescope was operated by the Royal Observatory, Edinburgh, with funding from the UK Science and Engineering Research Council (later the UK Particle Physics and Astronomy Research Council), until 1988 June, and thereafter by the Anglo-Australian Observatory. Supplemental funding for sky-survey work at the STScI is provided by the European Southern Observatory. This work made use of the HDAP which was produced at Landessternwarte Heidelberg-Konigstuhl under grant no. 00.071.2005 of the Klaus-Tschira-Foundation.