Classical T-Tauri stars with VPHAS+: II: NGC 6383 in Sh 2-012

Abstract

This paper presents optical ($ugri$H$\alpha$)-infrared ($JHK$s,3.6--8.0$\mu$m) photometry, and $Gaia$ astrometry of 55 Classical T-Tauri stars (CTTS) in the star-forming region Sh 2-012, and it's central cluster NGC 6383. The sample was identified based on photometric H$\alpha$ emission line widths, and has a median age of 2.8$\pm$1.6 Myr, with a mass range between 0.3-1 $M_{\odot }$. 94% 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 (${\dot{M}}_{\text{acc}}$) estimated via H$\alpha$ and $u$-band line intensities show a scatter (0.3 dex) similar to spectroscopic studies, indicating the suitability of H$\alpha$ photometry to estimate ${\dot{M}}_{\text{acc}}$. Examining the variation of ${\dot{M}}_{\text{acc}}$ with stellar mass ($M_{\ast }$), we find a smaller intercept in the ${\dot{M}}_{\text{acc}}$-$M_{\ast }$ relation than oft-quoted in the literature, providing evidence to discriminate between competing theories of protoplanetary disc evolution.

Accepted for publication in MNRAS; 12 pages, 9 figures; Table 1 is published in electronic form only along with the source code

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• A CCD Search for Variable Stars in the Open Cluster NGC 6611