Classical T Tauri stars with VPHAS plus - I. H alpha and u-band accretion rates in the Lagoon Nebula M8
File(s)1507.06786v1.pdf (8.07 MB) MNRAS-2015-Kalari-1026-46.pdf (6.21 MB)
Accepted version
Published version
Author(s)
Type
Journal Article
Abstract
We estimate the accretion rates of 235 Classical T Tauri star (CTTS) candidates in the Lagoon Nebula using ugri H α photometry from the VST Photometric H α survey+. Our sample consists of stars displaying H α 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 α and u-band intensities to be ∼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.
Date Issued
2015-08-22
Date Acceptance
2015-07-22
Citation
Monthly Notices of the Royal Astronomical Society, 2015, 453 (1), pp.1026-1046
ISSN
1365-2966
Publisher
Oxford University Press (OUP)
Start Page
1026
End Page
1046
Journal / Book Title
Monthly Notices of the Royal Astronomical Society
Volume
453
Issue
1
Copyright Statement
© 2015 The Author
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
accretion, accretion discs
stars: pre-main-sequence
stars: variables: T Tauri, Herbig Ae/Be
open clusters and associations: individual: NGC 6530, Lagoon Nebula, M8
MAIN-SEQUENCE STARS
CLUSTER NGC 6530
PROTOPLANETARY DISK EVOLUTION
HUBBLE-SPACE-TELESCOPE
GALACTIC PLANE IPHAS
LOW MASS STARS
FORMING REGION
YOUNG STARS
PHOTOMETRIC-DETERMINATION
STELLAR POPULATIONS
Publication Status
Published