Astronomy:V1315 Aquilae

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V1315 Aquilae is a cataclysmic variable star located in the constellation of Aquila. It is a type of cataclysmic variable known as a nova-like variable (NL),[1] specifically a SW Sextantis star.[2][3] Nova-like variables such as these SW Sextantis stars are characterized as having non-magnetic white dwarfs and do not undergo dwarf-nova eruptions.[1] There is some evidence that SW Sextantis stars may contain a magnetic white dwarf.[4][5] Being a SW Sextantis star, V1315 Aquilae has a high rate of mass transfer, so it is in steady-state accretion and in a constant state of outburst.[6] It emits the majority of its light in the visible range, which is emitted from the accretion disk.[6] The eclipse depth is 1.8 mag.[7] No description of the donating star has been mentioned.

Nova shell

V1315 Aquilae has a roughly spherical shell of material around it with a maximum mass of 1×10−5 solar masses, which is too small to be related to a planetary nebula or supernova remnant. It is predicted that this shell is the remnant of a nova eruption. This nova eruption is estimated to be roughly 500 to 1200 years old. V1315 Aquilae is the first nova-like star to have been discovered with a nova shell.[1]


  1. 1.0 1.1 1.2 Hallinan, G.; Littlefair, S. P.; Dhillon, V. S.; Sahman, D. I. (2018-04-16). "Discovery of an old nova shell surrounding the cataclysmic variable V1315 Aql" (in en). Monthly Notices of the Royal Astronomical Society 477 (4): 4483–4490. doi:10.1093/mnras/sty950. Bibcode2018MNRAS.477.4483S. 
  2. Rutten, R. G. M.; Dhillon, V. S. (1995-06-21) (in en). Spectropolarimetry of the nova-like variable V1315 Aql. doi:10.1093/mnras/277.3.777. 
  3. Hoard, D. W.. "The Big List of SW-Sextantis Stars". 
  4. Steeghs, D.; Hakala, P.; Martinez-Pais, I. G.; Casares, J.; Rodriguez-Gil, P. (2000-11-15) (in en). Evidence of magnetic accretion in an SW Sex star: discovery of variable circular polarization in LS Pegasi. doi:10.1086/318922. 
  5. Hoard, D. H.. "The Magnetic Scenario for the SW-Sextantis Stars". 
  6. 6.0 6.1 Rutten, R. G. M.; van Paradijs, J.; Tinbergen, J. (1992-07-01). "Reconstruction of the accretion disk in six cataclysmic variable stars". Astronomy and Astrophysics 260: 213–226. ISSN 0004-6361. Bibcode1992A&A...260..213R. 
  7. Szkody, Paula (1987-10-01). "Time-resolved IUE studies of cataclysmic variables. I - Eclipsing systems IP Peg, PG 1030+590, and V1315 AQL". The Astronomical Journal 94: 1055–1061. doi:10.1086/114540. ISSN 0004-6256. Bibcode1987AJ.....94.1055S. Aquilae was the original source. Read more.