The Pre-Main Sequence Stars
thematic team
Jane Gregorio-Hetem
Universidade de São Paulo
[email protected]
2nd CoRoT Brazil Workshop,Ubatuba, November 2005
Summary
• PMS - CoRoT: Brazilian Team Activities &
international cooperation;
• Detailed study of variable young stars of
the Pico dos Dias Survey (PDS);
• Possible targets for the next AOs.
CoRoT Pre-Main Sequence Stars
Brazilian Team Activities
T Tauri & Herbig Ae/Be stars - Gregorio-Hetem et al.
(USP & UFMG)
Young Associations – Torres et al. (LNA & ON)
Debris Disks – de la Reza et al. (ON & LNA)
Main topics on T Tauri & Herbig Ae/Be research
•
•
•
•
•
•
•
•
•
Sergio Vieira
Marcelo Guimarães
Sílvia Alencar
Wagner Corradi
Annibal Hetem Jr.
Marília Sartori
Claudia Rodrigues
Bruno Castilho
Simone Daflon
Status at the 1st CoRoT-Brazil Workshop,
Natal (2004)
variability
& pulsation
classification
& SED
polarimetry
chemical
composition
"PMS Cooperation" - more than 70
members!
Three accepted proposals to the AO1 dealing
with PMS stars:
• NGC 2264 (PI: Fabio Favata) > 50 members
of the PMS team.
• Young stars in the cluster Dolidze 25 (PI:
Vincenzo Ripepi)
• Herbig Ae/Be stars (PI: Claude Catala).
Letters of Interest (LOI)
PMS Stars
• Topics:
– Protoplanets
– PMS variability
– PMS solar-type stars
– Interaction of PMS objects with circumstellar structure
– PMS pulsation
• VV Ser & V 351 Ori
• V 588 Mon & V 589 Mon in NGC 2264
• other open clusters (Collinder 96, Dolidze 25, …)
lots of different physics involved
Oct. 31, 2004
COROT Workshop, Natal
Konstanze Zwintz (Inst. of Astronomy, Univ. Vienna, Austria)
After CW7 - Granada
Short Run Proposal on NGC 2264
• PI: F. Favata
• 5 subteams with leaders
–
–
–
–
–
Exoplanet search in the lower mass YSOs – S. Aigrain
Interaction of YSOs with circumstellar matter – S. Alencar
Asteroseismology of PMS stars – K. Zwintz
Stellar activity and rotation – G. Micela
Asteroseismology of main sequence B stars – C. Aerts
• shared preparatory work – shared (possible) COROT data
May 24-27, 2005
COROT Week 8, Toulouse
Konstanze Zwintz (Inst. of Astronomy, Univ. Vienna, Austria)
Short Run Proposal
• “Protoplanets”
• “Activity”
– S. Aigrain, D. Queloz, M.
Irwin, L. da Silva, S.
see
Hodgkin, T. Guillot, F.
talk
Bouchy, F. Pont, S. Zucker,
C. Moutou
• “Circumstellar Matter”
– S. Alencar, J. Bouvier, R.
de la Reza, M. Deleuil, M.
Fernandez, J.F. Gameiro,
J. Gregorio-Hetem, E.
Moraux, C.A. Torres
• “Main Sequence B Stars”
– C. Aerts - tbd
May 24-27, 2005
– G. Micela, E. Flaccomio, S.
Sciortino, R. Jeffries, J.
Stauffer, L. Rebull, J. Sanz,
I. Pagano
• “PMS Asteroseismology”
– K. Zwintz, E. Alfaro, P.
Amado, J. Ballot, T. Boehm,
C. Catala, A. Delgado, R.
Garrido, M. Goupil, M.
Marconi, J.P. Marques, M.
Monteiro, F.J.G. Pinheiro, V.
Ripepi, E. Rodriguez, S.
Turck-Chieze
COROT Week 8, Toulouse
Konstanze Zwintz (Inst. of Astronomy, Univ. Vienna, Austria)
Young stars in the field of the Open Cluster
Dolidze 25
PI: Vincenzo Ripepi
INAF-Osservatorio Astronomico di Capodimonte, Napoli, Italy
Co-Investigators:
J.M. Alcala, M. Marconi, M. Cignoni, E. Covino, S. Leccia, A. Ruoppo, L.
Terranegra - INAF- O.A. Capodimonte, Italy
S. Bernabei - INAF- O.A. Bologna, Italy
T. Boehm - OMP, France
C. Catala - Obs. Meudon, Paris, France
W. Corradi, S. Alencar - Universidade Federal de Minas Gerais, BH, Brazil
R. de la Reza, C. Chavero - Observatorio Nacional, Rio de Janeiro, Brazil;
S. Degl'Innocenti, P.G. Prada Moroni - Dip. Fisica, Universit a di Pisa, Italy
M. Deluil - LAM, Marseille, France
F. Favata - ESA, Netherlands
M. Fernandez - MPIA, Heidelberg, Germany
J. Gregorio-Hetem, J.R.D. Lepine - IAG, Sao Paulo, Brazil.
M.J.P.F.G. Monteiro, F. J. G. Pinheiro - Univ. Porto, Portugal
F. Palla - INAF- O.A. Arcetri, Italy
C.A.O. Torres , G. Quast – Laboratorio Nacional de Astrofisica, Itajuba, Brazil
K. Zwintz, W. Weiss - Institute of Astronomy, Vienna, Austria
Detailed Study of Variable
PDS pre-main sequence stars
• PMS candidates to
the CoRoT AP
Wagner Corradi et al.
Poster #3
PDS530 (Herbig Ae/Be)
• Target Selection to the
CoRoT AP
Fabio P. Santos et al.
Poster #11
PDS090; PDS091 (T Tauri);
NGC6633
Ground Based Observations at OPD
Pico dos Dias Observatory (Minas Gerais)
• IAG 60cm telescope
• BVRI photometry
• 4 missions x (5 nights)
three weeks intervals
• Monitoring ~ 10 fields
PDS 530 (star #2) and
nearby candidates (stars #1, 4 & 5)
PDS530
#3 and #6 are
comparison stars
Spectral Characteristics
PDS
ST
W(H ) W(Li) Class
Å
Å
aIR
Sc
%
090
K4-5
1
0.58
WTT
-1.4
29
091
M0
-54
0.35
CTT
-0.8
65
530
F0
-50
---
HAB
+0.5
83
T Tauri
HAeBe
H line profile related to the interaction with the circumstellar matter
T Tauri IR Classification
Evolutionary Sequence
André et al. (1994)
Evolutionary
scenario for
HAeBe stars
suggested by
Malfait et al.
(1998)
Comparing the SEDs
Herbig Ae/Be & T Tauri classes
1.0
Class I
group 1
group 2
group 3
0.5
530 x
IR
0.0
-0.5
x 91
-1.0
Class II
x 90
-1.5
Class III
-2.0
0
10
20
30
40
50
60
70
80
90
100
Sc [%]
Distribution of the spectral index, IR , as a function of Sc,
for the 3 groups. The divisions of the TT classes are
indicated by dashed horizontal lines and the approximate
limits of Sc for the 3 groups are indicated by vertical dotted
lines. (Sartori 2003 BAS Meeting)
Protoplanetary disks
Different Models, based on different geometries (see next talk)
Possible Candidate Targets for next AOs
Prime
target
Number of
candidates
Distance from the
prime target
HD49933
16
0.7o - 1.9o
HD170580
1
2.6o
HD171834
7
Objects
NGC2301,Bochum 2, Dolidze 25, PDS229N
NGC6633
0.9o - 1.9o
IC4756, PDS530E
HD177552
10
0.2o - 1.0o
Berkeley 81, five X-ray sources
HD181555
7
1.9o - 3.0o
NGC6775, three X-ray sources
0.5o - 2.7o
HBC547, PDS229N, PDS234, PDS241,
NGC2302, Bochum 3, Haffner 3, NGC 2338
1.6o - 3.0o
Collinder 91, Dolidze 22
HD 52265
24
HD 43587
Object
13
Number of
candidates
Distance from
the center field
Comments
Cluster 1
3
3.9o - 5.0o
HBC665N, PDS520, HBC285
Cluster 2
5
4.4o - 6.8o
HBC684N, four X-ray sources
Cluster 3
17
4.5o - 6.8o
PDS518, HBC284N, Trumpler 35, seven X-ray sources
Cluster 4
5
8.0o
12
3.0o - 7.0o
Other
NGC2219 (anti-center)
Several stars from the HBC, PDS and Tycho Catalogs
distributed in both, center and anti- center directions).
The Pre-Main Sequence Stars
thematic team
Jane Gregorio-Hetem
Universidade de São Paulo
[email protected]
THANK YOU!
2nd CoRoT Brazil Workshop,Ubatuba, November 2005