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Observations of galactic and extragalactic novae

  • Review Article
  • Published:
The Astronomy and Astrophysics Review Aims and scope

Abstract

The recent GAIA DR2 measurements of distances to galactic novae have allowed to re-analyse some properties of nova populations in the Milky Way and in external galaxies on new and more solid empirical bases. In some cases, we have been able to confirm results previously obtained, such as the concept of nova populations into two classes of objects, that is disk and bulge novae and their link with the Tololo spectroscopic classification in Fe II and He/N novae. The recent and robust estimates of nova rates in the Magellanic Clouds galaxies provided by the OGLE team have confirmed the dependence of the normalized nova rate (i.e., the nova rate per unit of luminosity of the host galaxy) with the colors and/or class of luminosity of the parent galaxies. The nova rates in the Milky Way and in external galaxies have been collected from literature and critically discussed. They are the necessary ingredient to asses the contribution of novae to the nucleosynthesis of the respective host galaxies, particularly to explain the origin of the overabundance of lithium observed in young stellar populations. A direct comparison between distances obtained via GAIA DR2 and maximum magnitude vs. rate of decline (MMRD) relationship points out that the MMRD can provide distances with an uncertainty better than 30%. Multiwavelength observations of novae along the whole electromagnetic spectrum, from radio to gamma rays, have revealed that novae undergo a complex evolution characterized by several emission phases and a non-spherical geometry for the nova ejecta.

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Notes

  1. Out of 37 that constitute his entire work

  2. We derived the GAIA DR2 distance of V1500 Cyg using the parallax provided in the GAIA DR2 database and using the formula given in Bailer-Jones et al. (2018), see also Muraveva et al. (2018). The GAIA DR2 archive is available at https://gea.esac.esa.int/archive/

  3. http://leda.univ-lyon1.fr/

  4. The GAIA DR2 distance of V1500 Cyg used in this paper, \(d = 1.29 \pm 0.31\), can be derived using the parallex measurement as provided in the GAIA DR2 data archive: https://gea.esac.esa.int/archive/.

  5. see Hyperleda archive: http://leda.univ-lyon1.fr

References