The Pre-Main Sequence Stars The Pre-Main Sequence Stars thematic teamthematic team

Jane Gregorio-HetemUniversidade de São Paulo

jane@astro.iag.usp.br

2nd CoRoT Brazil Workshop,Ubatuba, November 2005

SummarySummary

• 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 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)

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

classification & SED

variability & pulsation

polarimetry

chemical composition

Status at the 1st CoRoT-Brazil Workshop, Natal (2004)

"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

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

After CW7 - Granada

• 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

Short Run Proposal on NGC 2264

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

• “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

• “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

• “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

• “Main Sequence B Stars”– C. Aerts - tbd

Short Run Proposal

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

see talk

Young stars in the field of the Open Cluster Dolidze 25

PI: Vincenzo RipepiINAF-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, ItalyS. Bernabei - INAF- O.A. Bologna, ItalyT. Boehm - OMP, FranceC. Catala - Obs. Meudon, Paris, FranceW. Corradi, S. Alencar - Universidade Federal de Minas Gerais, BH, BrazilR. de la Reza, C. Chavero - Observatorio Nacional, Rio de Janeiro, Brazil;S. Degl'Innocenti, P.G. Prada Moroni - Dip. Fisica, Universit a di Pisa, ItalyM. Deluil - LAM, Marseille, FranceF. Favata - ESA, NetherlandsM. Fernandez - MPIA, Heidelberg, GermanyJ. Gregorio-Hetem, J.R.D. Lepine - IAG, Sao Paulo, Brazil.M.J.P.F.G. Monteiro, F. J. G. Pinheiro - Univ. Porto, PortugalF. Palla - INAF- O.A. Arcetri, ItalyC.A.O. Torres , G. Quast – Laboratorio Nacional de Astrofisica, Itajuba, BrazilK. Zwintz, W. Weiss - Institute of Astronomy, Vienna, Austria

Detailed Study of Variable PDS pre-main sequence stars

• 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) Poster #3 Poster #11

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)

#3 and #6 are comparison stars

PDS530

Spectral Characteristics

PDS ST W(H )

Å

W(Li)

Å

Class 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 T Tauri IR Classification Evolutionary SequenceEvolutionary 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

0 10 20 30 40 50 60 70 80 90 100

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

Class III

Class II

Class I

IR

Sc [%]

group 1 group 2 group 3

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)

x 90

x 91

530 x

Protoplanetary disksProtoplanetary 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

Objects

HD49933 16 0.7o - 1.9o NGC2301,Bochum 2, Dolidze 25, PDS229N

HD170580 1 2.6o NGC6633

HD171834 7 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

HD 5226524

0.5o - 2.7o HBC547, PDS229N, PDS234, PDS241, NGC2302, Bochum 3, Haffner 3, NGC 2338

HD 43587 13 1.6o - 3.0o Collinder 91, Dolidze 22

Object 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 NGC2219 (anti-center)

Other12 3.0o - 7.0o

Several stars from the HBC, PDS and Tycho Catalogs distributed in both, center and anti- center directions).

The Pre-Main Sequence Stars The Pre-Main Sequence Stars thematic teamthematic team

Jane Gregorio-HetemUniversidade de São Paulo

jane@astro.iag.usp.br

THANK YOU!

2nd CoRoT Brazil Workshop,Ubatuba, November 2005