University of Hertfordshire

From the same journal

From the same journal

By the same authors


  • 1903.11026v1

    Accepted author manuscript, 1 MB, PDF-document

  • stz878

    Final published version, 1 MB, PDF-document

  • Thiago Ferreira
  • Roberto K. Saito
  • Dante Minniti
  • María Gabriela Navarro
  • Rodrigo Contreras Ramos
  • Leigh Smith
  • Philip W. Lucas
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Original languageEnglish
Number of pages5
Pages (from-to)1220–1224
JournalMonthly Notices of the Royal Astronomical Society
Journal publication dateJun 2019
Early online date27 Mar 2019
Publication statusPublished - Jun 2019


Stellar mergers are estimated to be common events in the Galaxy. The best studied stellar merger case to date is V1309 Sco (= Nova Scorpii 2008) which was originally misclassified as a Nova event. Later identified as the merger of the components of a cool overcontact binary system with 1.52 Msun and 0.16 Msun, V1309 Sco showed an initial period of P = 1.4 days before the merger. Post-outburst evolution demonstrated that V1309 Sco was unlike the typical Classical Novae and Symbiotic Recurrent Novae with significant dust production around it, and indicated that the system may become a post-AGB (or pre-PN) soon. Here we present a study of V1309 Sco about ten years after the outburst, based on near-IR variability and colour data from the ESO surveys VISTA Variables in the V\'{i}a L\'actea (VVV) and VVV eXtended (VVVX). We find that reasonable equilibrium in this stellar merger is being reached and that the star has settled into a nearly constant magnitude. A dramatic change in its near-IR colours from (J-Ks) = 1.40 in 2010 to (J-Ks) = 0.42 in 2015 and a possible low amplitude periodic signal with P = 0.49 days in the post-outburst data are consistent with a "blue straggler" star, predicted to be formed from a stellar merger.


Accepted for publication in MNRAS, 6 pages and 4 figures

ID: 17202962