Bibcode
Barentsen, Geert; Vink, Jorick S.; Drew, J. E.; Greimel, R.; Wright, N. J.; Drake, J. J.; Martin, E. L.; Valdivielso, L.; Corradi, R. L. M.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 415, Issue 1, pp. 103-132.
Advertised on:
7
2011
Citations
95
Refereed citations
87
Description
The Isaac Newton Telescope (INT) Photometric H-Alpha Survey (IPHAS) is a
1800 deg2 survey of the Northern Galactic Plane, reaching
down to r'˜ 21. We demonstrate how the survey can be used to (1)
reliably select classical T Tauri star candidates and (2) constrain the
mass accretion rates with an estimated relative uncertainty of 0.6 dex.
IPHAS is a necessary addition to spectroscopic surveys because it allows
large and uniform samples of accretion rates to be obtained with a
precise handle on the selection effects.
We apply the method on a region of 7 deg2 towards the H II
region IC 1396 in Cepheus OB2 and identify 158 pre-main-sequence
candidates with masses between 0.2 and 2.0 M&sun; and
accretion rates between 10-9.2 and 10-7.0
M&sun; yr-1. We find a power-law dependency
between the stellar mass and the accretion rates with a slope of
α= 1.1 ± 0.2, which is less steep than indicated by
previous studies. We discuss the influence of method-dependent
systematic effects on the determination of this relationship.
The majority of our sample consists of faint, previously unknown,
low-mass T Tauri candidates (56 per cent between 0.2 and 0.5
M&sun;). Many candidates are clustered in front of three
bright-rimmed molecular clouds, which are being ionized by the massive
star HD 206267 (O6.5V). We discover a spatio-temporal gradient of
increasing accretion rates, increasing Spitzer infrared excess, and
younger ages away from the ionizing star, providing a strong indication
that the formation of these clusters has been sequentially triggered by
HD 206267 during the last ˜1 Myr.
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