2019MNRAS.484.5102K -
Mon. Not. R. Astron. Soc., 484, 5102-5112 (2019/April-3)
Classical T-Tauri stars with VPHAS+: II: NGC 6383 in Sh 2-012.
KALARI V.M.
Abstract (from CDS):
This paper presents optical (ugriHα)-infrared (JHKs, 3.6-8.0 µm) photometry and Gaia astrometry of 55 Classical T-Tauri stars (CTTS) in the star-forming region Sh 2-012 and its central cluster NGC 6383. The sample was identified based on photometric Hα emission linewidths, and has a median age of 2.8 ± 1.6 Myr, with a mass range between 0.3 and 1 M☉. 94 per cent of CTTS with near-infrared cross-matches fall on the near-infrared T-Tauri locus, with all stars having mid-infrared photometry exhibiting evidence for accreting circumstellar discs. CTTS are found concentrated around the central cluster NGC 6383, and towards the bright rims located at the edges of Sh 2-012. Stars across the region have similar ages, suggestive of a single burst of star formation. Mass accretion rates ({dot}M\textrmacc) estimated via Hα and u-band line intensities show a scatter (0.3 dex) similar to spectroscopic studies, indicating the suitability of Hα photometry to estimate {dot}M\textrmacc. Examining the variation of {dot}M\textrmacc with stellar mass (M*), we find a smaller intercept in the {dot}M\textrmacc-M* relation than oft-quoted in the literature, providing evidence to discriminate between competing theories of protoplanetary disc evolution.
Abstract Copyright:
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
accretion, accretion discs - stars: pre-main sequence - stars: variables: T Tauri - open clusters and associations: individual: Sh 2-012 - open clusters and associations: individual: NGC 6383
VizieR on-line data:
<Available at CDS (J/MNRAS/484/5102): table1.dat>
Simbad objects:
66
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