Astronomy & Astrophysics

Free access article

A&A 464, 55-58 (2007)
DOI: 10.1051/0004-6361:20065719

Constraining the wind launching region in Herbig Ae stars: AMBER/VLTI spectroscopy of HD 104237

E. Tatulli¹, A. Isella^{1, 2}, A. Natta¹, L. Testi¹, A. Marconi¹, F. Malbet³, P. Stee⁴, R.G. Petrov⁵, F. Millour^{3, 5}, A. Chelli³, G. Duvert³, P. Antonelli⁴, U. Beckmann⁶, Y. Bresson⁴, M. Dugué⁴, S. Gennari¹, L. Glück³, P. Kern³, S. Lagarde⁴, E. Le Coarer³, F. Lisi¹, K. Perraut³, P. Puget³, F. Rantakyrö⁷, S. Robbe-Dubois⁵, A. Roussel⁴, G. Weigelt⁶, G. Zins³, M. Accardo¹, B. Acke^{3, 8}, K. Agabi⁵, E. Altariba³, B. Arezki³, E. Aristidi⁵, C. Baffa¹, J. Behrend⁶, T. Blöcker⁶, S. Bonhomme⁴, S. Busoni¹, F. Cassaing⁹, J.-M. Clausse⁴, J. Colin⁴, C. Connot⁶, A. Delboulbé³, A. Domiciano de Souza^{5, 4}, T. Driebe⁶, P. Feautrier³, D. Ferruzzi¹, T. Forveille³, E. Fossat⁵, R. Foy¹⁰, D. Fraix-Burnet³, A. Gallardo³, E. Giani¹, C. Gil^{3, 11}, A. Glentzlin⁴, M. Heiden⁶, M. Heininger⁶, O. Hernandez Utrera³, K.-H. Hofmann⁶, D. Kamm⁴, M. Kiekebusch⁷, S. Kraus⁶, D. Le Contel⁴, J.-M. Le Contel⁴, T. Lesourd¹², B. Lopez⁴, M. Lopez¹², Y. Magnard³, G. Mars⁴, G. Martinot-Lagarde^{12, 4}, P. Mathias⁴, P. Mège³, J.-L. Monin³, D. Mouillet^{3, 13}, D. Mourard⁴, E. Nussbaum⁶, K. Ohnaka⁶, J. Pacheco⁴, C. Perrier³, Y. Rabbia⁴, S. Rebattu⁴, F. Reynaud¹⁴, A. Richichi¹⁵, A. Robini⁵, M. Sacchettini³, D. Schertl⁶, M. Schöller⁷, W. Solscheid⁶, A. Spang⁴, P. Stefanini¹, M. Tallon¹⁰, I. Tallon-Bosc¹⁰, D. Tasso⁴, F. Vakili⁵, O. von der Lühe¹⁶, J.-C. Valtier⁴, M. Vannier^{5, 7, 17}, and N. Ventura³

¹ INAF-Osservatorio Astrofisico di Arcetri, Istituto Nazionale di Astrofisica, Largo E. Fermi 5, 50125 Firenze, Italy
² Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
³ Laboratoire d'Astrophysique de Grenoble, UMR 5571 Université Joseph Fourier/CNRS, BP 53, 38041 Grenoble Cedex 9, France
⁴ Laboratoire Gemini, UMR 6203 Observatoire de la Côte d'Azur/CNRS, BP 4229, 06304 Nice Cedex 4, France
⁵ Laboratoire Universitaire d'Astrophysique de Nice, UMR 6525 Université de Nice - Sophia Antipolis/CNRS, Parc Valrose, 06108 Nice Cedex 2, France
⁶ Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
⁷ European Southern Observatory, Casilla 19001, Santiago 19, Chile
⁸ Instituut voor Sterrenkunde, KU-Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
⁹ ONERA/DOTA, 29 av de la Division Leclerc, BP 72, 92322 Chatillon cedex, France
¹⁰ Centre de Recherche Astronomique de Lyon, UMR 5574 Université Claude Bernard/CNRS, 9 avenue Charles André, 69561 Saint Genis Laval Cedex, France
¹¹ Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
¹² Division Technique INSU/CNRS UPS 855, 1 place Aristide Briand, 92195 Meudon Cedex, France
¹³ Laboratoire Astrophysique de Toulouse, UMR 5572 Université Paul Sabatier/CNRS, BP 826, 65008 Tarbes Cedex, France
¹⁴ IRCOM, UMR 6615 Université de Limoges/CNRS, 123 avenue Albert Thomas, 87060 Limoges Cedex, France
¹⁵ European Southern Observatory, Karl Schwarzschild Strasse 2, 85748 Garching, Germany
¹⁶ Kiepenheuer Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, Germany
¹⁷ Departamento de Astronomia, Universidad de Chile, Chile

(Received 29 May 2006 / Accepted 26 June 2006 )

Abstract
Aims.We investigate the origin of the ${\rm Br}\gamma$ emission of the Herbig Ae star HD 104237 on Astronomical Unit (AU) scales.
Methods.Using AMBER/VLTI at a spectral resolution $\mathcal{R}=1500$ we spatially resolve the emission in both the ${\rm Br}\gamma$ line and the adjacent continuum.
Results.The visibility does not vary between the continuum and the ${\rm Br}\gamma$ line, even though the line is strongly detected in the spectrum, with a peak intensity 35% above the continuum. This demonstrates that the line and continuum emission have similar size scales. We assume that the K-band continuum excess originates in a "puffed-up" inner rim of the circumstellar disk, and discuss the likely origin of ${\rm Br}\gamma$ .
Conclusions.We conclude that this emission most likely arises from a compact disk wind, launched from a region 0.2-0.5 AU from the star, with a spatial extent similar to that of the near infrared continuum emission region, i.e., very close to the inner rim location.

Key words: stars: individual: HD 104237 -- stars: pre-main sequence -- technique: interferometric

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