2010A&A...510A..72F


Query : 2010A&A...510A..72F

2010A&A...510A..72F - Astronomy and Astrophysics, volume 510, A72-72 (2010/2-1)

Timescale of mass accretion in pre-main-sequence stars.

FEDELE D., VAN DEN ANCKER M.E., HENNING T., JAYAWARDHANA R. and OLIVEIRA J.M.

Abstract (from CDS):

We present the initial result of a large spectroscopic survey aimed at measuring the timescale of mass accretion in young, pre-main-sequence stars in the spectral type range K0-M5. Using multi-object spectroscopy with VIMOS at the VLT we identified the fraction of accreting stars in a number of young stellar clusters and associations of the ages of between 1-30Myr. The fraction of accreting stars decreases from ∼60% at 1.5-2Myr to ∼2% at 10Myr. No accreting stars are found after 10Myr at a sensitivity limit of 10–11M/yr. We compared the fraction of stars showing ongoing accretion (facc) to the fraction of stars with near-to-mid infrared excess (fIRAC). In most cases we find facc<fIRAC, i.e., mass accretion appears to cease (or drop below detectable level) earlier than the dust is dissipated in the inner disk. At 5Myr, 95% of the stellar population has stopped accreting material at a rate of >10–11M/yr, while ∼20% of the stars show near-infrared excess emission. Assuming an exponential decay, we measure a mass accretion timescale (τacc) of 2.3Myr, compared to a near-to-mid infrared excess timescale (τIRAC) of 3Myr. Planet formation and/or migration, in the inner disk might be a viable mechanism to halt further accretion onto the central star on such a short timescale.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: pre-main sequence - planetary systems: protoplanetary disks

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME THA As* 00 00 -62.0           ~ 433 0
2 IC 348 OpC 03 44 32 +32 09.5           ~ 1327 1
3 NAME 25 Ori Group OpC 05 24 48 +01 39.3           ~ 138 1
4 Cl Collinder 65 OpC 05 26 06 +16 42.0           ~ 30 0
5 [W96] rJ053820-0237 LM* 05 38 20.2123248864 -02 38 01.667415300   19.07 17.47 16.08 14.27 M4-5e 21 0
6 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 532 0
7 M 78 RNe 05 46 45.8 +00 04 45   8.0       ~ 366 0
8 NGC 2071 RNe 05 47 10 +00 18.0           ~ 628 1
9 NGC 2169 OpC 06 08 30 +13 57.1   5.99 5.9     ~ 152 0
10 NAME Taurus Cluster Cl* 06 10.1 +09 05           ~ 72 0
11 NGC 2353 OpC 07 14 34 -10 15.4   7.30 7.1     ~ 91 0
12 NGC 2362 OpC 07 18 41 -24 57.2           ~ 389 0
13 NAME eta Cha Association OpC 08 42 33 -78 57.8           ~ 347 0
14 [KPR2005] 58 OpC 10 14 38 -55 00.1           ~ 29 0
15 NAME TW Hya Association As* 11 01.9 -34 42           ~ 903 0
16 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1085 1
17 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 704 0
18 NAME Upper Sco Association As* 16 12 -23.4           ~ 1236 1
19 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3417 1
20 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 515 0
21 M 21 OpC 18 04 09 -22 30.3           ~ 138 0
22 NGC 6664 OpC 18 36 30 -08 11.6   8.81 7.8     ~ 112 0
23 NGC 7160 OpC 21 53 48 +62 35.3   6.34 6.1     ~ 227 0

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2022.12.04-09:32:57

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