J/A+A/586/A96 Disk-locking PMS evolutionary tracks (Landin+, 2016)
Stellar models simulating the disk-locking mechanism and the evolutionary
history of the Orion Nebula cluster and NGC 2264.
Landin N.R., Mendes L.T.S., Vaz L.P.R, Alencar S.H.P.
<Astron. Astrophys. 586, A96 (2016)>
=2016A&A...586A..96L 2016A&A...586A..96L (SIMBAD/NED BibCode)
ADC_Keywords: Models, evolutionary ; Stars, pre-main sequence
Keywords: stars: evolution - stars: interiors - stars: rotation -
stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be -
stars: low-mass
Abstract:
Rotational evolution in young stars is described by pre-main
sequence evolutionary tracks including non-gray boundary conditions,
rotation, conservation of angular momentum, and simulations of
disk-locking.
By assuming that disk-locking is the regulation mechanism for the
stellar angular velocity during the early stages of pre-main
sequence evolution, we use our rotating models and observational data
to constrain disk lifetimes (Tdisk) of a representative sample of
low-mass stars in two young clusters, the Orion Nebula cluster (ONC)
and NGC 2264, and to better understand their rotational evolution.
The period distributions of the ONC and NGC 2264 are known to be
bimodal and to depend on the stellar mass. To follow the rotational
evolution of these two clusters' stars, we generated sets of
evolutionary tracks from a fully convective configuration with low
central temperatures (before D- and Li-burning). We assumed that the
evolution of fast rotators can be represented by models considering
conservation of angular momentum during all stages and of moderate
rotators by models considering conservation of angular velocity during
the first stages of evolution. With these models we estimate a mass
and an age for all stars.
Description:
These data present new pre-main sequence evolutionary tracks
(including moments of inertia and rotation periods) for 0.15, 0.2,
0.3, 0.4, 0.5, 0.6, 0.7 and 0.8 solar masses. The tracks were
generated with a modified version of D'Antona & Mazzitelli's code (the
ATON code) described in Ventura et al. (1998A&A...334..953V 1998A&A...334..953V). In this
new version we included non-gray boundary conditions, rotation with
conservation of angular momentum and with conservation of angular
velocity (the disk-locking mechanism).
Our results are presented in five tables for five sets of tracks:
1) models with conservation of angular momentum,
2) disk-locking models with locking period, Plock, of 5 days and disk
lifetime, Tdisk, of 0.5Myr,
3) disk-locking models with Plock=5 days and Tdisk=1Myr,
4) disk-locking models with Plock=8 days and Tdisk=0.5Myr,
5) disk-locking models with Plock=8 days and Tdisk=1 Myr.
All models were computed with solar metallicity (Z=0.0175, Y=0.27) and
alpha=2.0 (mixing length theory parameter).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1a.dat 68 160 Models conserving angular momentum
table1b.dat 68 160 Disk-locking models (Plock=5d Tdisk=0.5Myr)
table1c.dat 68 160 Disk-locking models (Plock=5d Tdisk=1Myr)
table1d.dat 68 160 Disk-locking models (Plock=8d Tdisk=0.5Myr)
table1e.dat 68 160 Disk-locking models (Plock=8d Tdisk=1Myr)
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See also:
J/A+A/496/223 : PMS tracks at low Z for 0.1≤M≤1.5 (Di Criscienzo+, 2009)
J/A+A/510/A46 : Pre-main sequence evolutionary tracks (Landin+, 2010)
J/A+A/533/A109 : Pisa pre-main sequence tracks and isochrones (Tognelli+, 2011)
J/A+A/541/A113 : Evolutionary tracks for pre-main sequence stars (Claret, 2012)
Byte-by-byte Description of file: table1*.dat
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Bytes Format Units Label Explanations
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1- 4 F4.2 Msun Mass Mass
7- 13 F7.4 [yr] log(Age) Age of models
16- 22 F7.4 [Lsun] log(L) Total luminosity
26- 31 F6.4 [K] log(Teff) Effective temperature
36- 40 F5.3 --- Mconv/Mtot Mass of convective envelope relative to
total mass
43- 49 F7.4 [g.cm2] log(Itot) Total rotational inertia
52- 58 F7.4 [g.cm2] log(Iconv) Rotational inertia in the
convective envelope
62- 68 F7.3 d Prot Rotation period
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Acknowledgements:
Natalia Landin, nlandin(at)fisica.ufmg.br
(End) Patricia Vannier [CDS] 07-Dec-2015