The PreMain Sequence Stars thematic team

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The Pre-Main Sequence Stars thematic team

• Jane Gregorio-Hetem
• Universidade de São Paulo
• jane_at_astro.iag.usp.br

2nd CoRoT Brazil Workshop,Ubatuba, November 2005
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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.

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CoRoT Pre-Main Sequence StarsBrazilian 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)
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Main topics on T Tauri Herbig Ae/Be research
variability pulsation

• Sergio Vieira
• Marcelo Guimarães
• Sílvia Alencar
• Wagner Corradi
• Annibal Hetem Jr.
• Marília Sartori
• Claudia Rodrigues
• Bruno Castilho
• Simone Daflon

classification SED
polarimetry
chemical composition
Status at the 1st CoRoT-Brazil Workshop, Natal
(2004)
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"PMS Cooperation" - more than 70 members!

• Three accepted proposals to the AO1 dealing with
  PMS stars
• NGC 2264 (PI Fabio Favata) gt 50 members of the
  PMS team.
• Young stars in the cluster Dolidze 25 (PI
  Vincenzo Ripepi)
• Herbig Ae/Be stars (PI Claude Catala).

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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
COROT Workshop, Natal Konstanze Zwintz (Inst. of
Astronomy, Univ. Vienna, Austria)
Oct. 31, 2004
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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

COROT Week 8, Toulouse Konstanze Zwintz (Inst. of
Astronomy, Univ. Vienna, Austria)
May 24-27, 2005
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Short Run Proposal

• Protoplanets
• S. Aigrain, D. Queloz, M. Irwin, L. da Silva, S.
  Hodgkin, T. Guillot, F. Bouchy, F. Pont, S.
  Zucker, C. Moutou

• Activity
• G. Micela, E. Flaccomio, S. Sciortino, R.
  Jeffries, J. Stauffer, L. Rebull, J. Sanz, I.
  Pagano

see talk

• 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

• 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

COROT Week 8, Toulouse Konstanze Zwintz (Inst. of
Astronomy, Univ. Vienna, Austria)
May 24-27, 2005
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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

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Detailed Study of Variable PDS pre-main sequence
stars

• PMS candidates to the CoRoT AP
• Wagner Corradi et al.
• PDS530 (Herbig Ae/Be)

• Target Selection to the CoRoT AP
• Fabio P. Santos et al.
• PDS090 PDS091 (T Tauri)
• NGC6633

Poster 11
Poster 3
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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

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PDS 530 (star 2) and nearby candidates (stars
1, 4 5)
PDS530
3 and 6 are comparison stars
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Spectral Characteristics
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T Tauri
HAeBe
Ha line profile related to the interaction with
the circumstellar matter
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T Tauri IR Classification Evolutionary Sequence
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• André et al. (1994)

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Evolutionary scenario for HAeBe stars suggested
by Malfait et al. (1998)
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Comparing the SEDs
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Herbig Ae/Be T Tauri classes
530 x
x 91
x 90
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)
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Protoplanetary disks
Different Models, based on different geometries
(see next talk)
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Possible Candidate Targets for next AOs

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The Pre-Main Sequence Stars thematic team

• Jane Gregorio-Hetem
• Universidade de São Paulo
• jane_at_astro.iag.usp.br
• THANK YOU!

2nd CoRoT Brazil Workshop,Ubatuba, November 2005