The Pre-Main Sequence Stars thematic team

1. The Pre-Main Sequence Stars thematic team Jane Gregorio-Hetem Universidade de São Paulo jane@astro.iag.usp.br 2nd CoRoT Brazil Workshop,Ubatuba, November 2005

2. 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.

3. 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)

4. 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)

5. "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).

6. 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

7. After CW7 - Granada • PI: F. Favata • 5 subteamswith 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 Short Run Proposal on NGC 2264 COROT Week 8, Toulouse Konstanze Zwintz (Inst. of Astronomy, Univ. Vienna, Austria) May 24-27, 2005

8. “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 Short Run Proposal 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

9. 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

10. Target Selection to the CoRoT AP Fabio P. Santos et al. PDS090; PDS091 (T Tauri); NGC6633 PMS candidates to the CoRoT AP Wagner Corradi et al. PDS530 (Herbig Ae/Be) Detailed Study of Variable PDS pre-main sequence stars Poster #11 Poster #3

11. Ground Based Observations at OPDPico dos Dias Observatory (Minas Gerais) • IAG 60cm telescope • BVRI photometry • 4 missions x (5 nights) three weeks intervals • Monitoring ~ 10 fields

12. PDS 530 (star #2) and nearby candidates (stars #1, 4 & 5) PDS530 #3 and #6 are comparison stars

13. Spectral Characteristics

14. T Tauri HAeBe Ha line profile related to the interaction with the circumstellar matter

15. T Tauri IR Classification Evolutionary Sequence

16. André et al. (1994)

17. Evolutionary scenario for HAeBe stars suggested by Malfait et al. (1998)

18. Comparing the SEDs

19. Herbig Ae/Be & T Tauri classes 530 x x 91 x 90 Distribution of the spectral index,IR, as a function ofSc, for the 3 groups. The divisions of the TT classes are indicated bydashed horizontal linesand the approximate limits ofScfor the 3 groups are indicated byvertical dotted lines. (Sartori 2003 BAS Meeting)

20. Protoplanetary disks Different Models, based on different geometries (see next talk)

21. Possible Candidate Targets for next AOs

24. The Pre-Main Sequence Stars thematic team Jane Gregorio-Hetem Universidade de São Paulo jane@astro.iag.usp.br THANK YOU! 2nd CoRoT Brazil Workshop,Ubatuba, November 2005