University of Hertfordshire

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  • V. M. Kalari
  • J. S. Vink
  • J.E. Drew
  • G. Barentsen
  • J. J. Drake
  • J. Eislöffel
  • E.L. Martín
  • Q. A. Parker
  • Y.C. Unruh
  • N. A. Walton
  • N. J. Wright
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Original languageEnglish
Pages (from-to)1026-1046
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date11 Oct 2015
Volume453
Issue1
Early online date22 Aug 2015
DOIs
Publication statusPublished - 11 Oct 2015

Abstract

We estimate the accretion rates of 235 Classical T Tauri star (CTTS) candidates in the Lagoon Nebula using $ugri$H$\alpha$ photometry from the VPHAS+ survey. Our sample consists of stars displaying H$\alpha$-excess, the intensity of which is used to derive accretion rates. For a subset of 87 stars, the intensity of the $u$-band excess is also used to estimate accretion rates. We find the mean variation in accretion rates measured using H$\alpha$ and $u$-band intensities to be $\sim$ 0.17 dex, agreeing with previous estimates (0.04-0.4 dex) but for a much larger sample. The spatial distribution of CTTS align with the location of protostars and molecular gas suggesting that they retain an imprint of the natal gas fragmentation process. Strong accretors are concentrated spatially, while weak accretors are more distributed. Our results do not support the sequential star forming processes suggested in the literature.

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