Discos de transición a 5 millones de años

Discos de transición a 5 millones de años
IRAS 100 micron, 10x10 deg
Barnard 30
4.5 deg
Barnard 35
Collinder 69
Dolan & Mathieu 1999, 2001 (B30 & B35)
Dolan & Mathieu 1999, 2001 (C69)
ByN et al. 2004 (C69)
It is dominated by the O8 III
star lambda Orionis. It includes:
LOri cluster (Coll 69)
B35 and B30 dark clouds
S 264 HII region
A CO and a dust ring
The Coll 69 cluster:
400 pc
5 Myr
E(B-V)=0.12
AU Mic
Spitzer
24 arcmin
2.8 pc
Lambda Ori
[3.6] image
60x60 arcmin IRAC mosaic
[8.0] image
Spitzer: discos ircun(sub)stelares y acrecimiento
CTT
CTT
Spitzer: Circun(sub)stellar disks and accretion
DM/dt=1e-6 M(sun)
Increasing accretion
dM/dt=1e-9 M(sun)
IRAC versus W(alpha)
After Barrado y Navascués & Martín (2003)
Spitzer: discus circunestelares y acrecimiento
Hartmann et al. 2005
Sicilia-Aguilar et al. 2005
Halpha
Sicilia-Aguilar et al. 2005
Spitzer
David Barrado y Navascués
Spitzer: Excessos a 24 micras: discos de transición
VLM Stars
David Barrado y Navascués
Brown Dwarfs
Spitzer: discos de transición
Spitzer: discos de transición
David Barrado y Navascués
Siguiente paso: ASTRO-F y más Spitzer
Continuará .........
David Barrado y Navascués
David Barrado y Navascués
David Barrado y Navascués
David Barrado y Navascués
The age of C69: Lithium
Coll69, DM99
DM1999,
B30&B35
DM1999,
C69
Coll69, ByN2004
Lithium
depletion isochrones
B30&B35
ByN2005
25 medium resolution spectra
I = 13.7 – 17.6 mag,
Sp. Type = M4 - M6
David Barrado y Navascués
The age of C69: Potassium and the gravity
David Barrado y Navascués
La formación estelar y
planetaria:
visión
canónica
0) The Lambda Orionis SFR: star formation triggered by a SN?
Doland & Mathieu (2002)
Collinder 69.6 Myr
Barnard 30 &
Barnard 35.1 Myr
LDN1588 &
LDN1603.0 Myr
The Lambda Orionis Star Forming Region:
star formation triggered by a supernova
DM1999
B stars
IRAS
Collinder 69 (the lambda Orionis open cluster)
a) CFHT1999, 2MASS and Keck/LRIS: a deep optical search
b) The IMF in the substellar domain, 50-0.020 M(sun)
d) The age of Collinder 69: HR diagram, lithium, gravity.
e) Spitzer: Circun(sub)stellar disks and accretion. Spatial
distribution
f)
INT/WFC, WHT/INGRID and XMM: variability
g) Spitzer and WHT/INGRID: the planetary mass domain
David Barrado y Navascués
CONCLUSIONS
- A complete IMF in the range 50-0.020 Msun
- The ratio between CTT and WTT objects is larger than the
ration of accreting objects
- Some protoplanetary disks might be formed at 5 Myr
- Homegeneous distribution of BBs, but CTT might be located in filaments
- Variability in BD and IPMO
Future:
- Connection Xray-activity-CTT/WTT-rotation
- Binarity in Collinder 69
- The IMFs in the different regions of the LOri SFR
- The Class I, II and III populations in the whole SFR
David Barrado y Navascués
Desde las nubes a los planetas
Discos de transición