HAL : in2p3-00011059, version 1

arXiv : astro-ph/0106231

DOI : 10.1051/0004-6361:20011204

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Astronomy and Astrophysics 378 (2001) 1014-1023

Photometric constraints on microlens spectroscopy of EROS-BLG-2000-5

C. Afonso1, J-N. Albert2, J. Andersen, R. Ansari2, E. Aubourg1, P. Bareyre1, 3, F. Bauer1, G. Blanc1, A. Bouquet3, S. Char, X. Charlot1, F. Couchot2, C. Coutures1, F. Derue, R. Ferlet4, P. Fouque5, J-F. Glicenstein1, B. Goldman1, A. Gould3, D. Graff1, M. Gros1, J. Haissinski2, J-C. Hamilton3, D. Hardin1, J. De Kat1, A. Kim3, T. Lasserre1, L. LeGuillou1, E. Lesquoy1, 4, C. Loup4, C. Magneville1, B. Mansoux2, J-B. Marquette4, E. Maurice6, A. Milsztajn1, M. Moniez2, N. Palanque-Delabrouille1, O. Perdereau2, L. prevot, N. Regnault2, J. Rich1, M. Spiro1, A. Vidal-Madjar4, L. Vigroux1, S. Zylberajch1

EROS Collaboration(s)

(2001)

We apply EROS photometric data to interpret previously published Keck and VLT spectra of the binary-microlens caustic-crossing event EROS-BLG-2000-5. We show that the VLT data imply that the outer ${\sim} 4\%$ of the limb of the K3-giant source is strongly in emission in H$\alpha$, in contradiction to available models of the photosphere. This conflict could be resolved if the integrated H$\alpha$ emission from the chromosphere were equal to 8% of the integrated H$\alpha$ absorption from the source as a whole. These conclusions regarding the extreme limb are almost completely model-independent. We also present a general method for using the photometric data to facilitate direct comparison between the atmospheric model and the spectroscopic data. While this method has some model-dependent features, it is fairly robust and can serve to guide the analysis of spectra while more detailed models of the lens geometry are being developed. In addition, we find that the color of the limb of the source (outer 5.5% by radius) is $\Delta(V-I)\sim 0.37$ redder than the source as a whole, so that it has the color of a M0 giant.

1 :	DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 :	LAL - Laboratoire de l'Accélérateur Linéaire
3 :	PCC - Physique Corpusculaire et Cosmologie - Collège de France
4 :	IAP - Institut d'Astrophysique de Paris
5 :	DESPA - Departement de recherche SPAtiale
6 :	LAM - Laboratoire d'Astrophysique de Marseille

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique

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Contributeur : Simone Lantz <>

Soumis le : Lundi 18 Septembre 2006, 13:50:12

Dernière modification le : Lundi 18 Septembre 2006, 13:50:23