Search

Your search keyword '"Herbst T"' showing total 15 results
Start Over Author "Herbst T" Publication Type Books
15 results on '"Herbst T"'

2. Eta Car through the Eyes of Interferometers

Author

Chesneau, O., primary, Boekel, R. van, additional, Herbst, T., additional, Kervella, P., additional, Min, M., additional, Waters, L.B.F.M., additional, Leinert, Ch., additional, Petrov, R., additional, and Weigelt, G., additional

Published
2007
Full Text
View/download PDF

10. Photodissociation Regions in Young PN

Author

Graham, James R., primary, Herbst, T. M., additional, Beckwith, S., additional, Matthews, K., additional, Neugebauer, G., additional, Serabyn, E., additional, and Soifer, B. T., additional

Published
1994
Full Text
View/download PDF

12. GENIE: a Ground-Based European Nulling Instrument at ESO Very Large Telescope Interferometer

Author

Gondoin, P., primary, Hartog, R. den, additional, Fridlund, M., additional, Fabry, P., additional, Stankov, A., additional, Peacock, A., additional, Volonte, S., additional, Puech, F., additional, Delplancke, F., additional, Gitton, P., additional, Glindemann, A., additional, Paresce, F., additional, Richichi, A., additional, Barillot, M., additional, Absil, O., additional, Cassaing, F., additional, Coudédu Foresto, V., additional, Kervella, P., additional, Perrin, G., additional, Ruilier, C., additional, Flatscher, R., additional, Bokhove, H., additional, Ergenzinger, K., additional, Quirrenbach, A., additional, Wallner, O., additional, Alves, J., additional, Herbst, T., additional, Mourard, D., additional, Neuhäuser, R., additional, Ségransan, D., additional, Waters, R., additional, and White, G.J., additional

Full Text
View/download PDF

14. Eta Car through the Eyes of Interferometers.

Author

Leibundgut, Bruno, Richichi, A., Delplancke, F., Paresce, F., Chelli, A., Chesneau, O., Boekel, R. van, Herbst, T., Kervella, P., Min, M., Waters, L.B.F.M., Leinert, Ch., Petrov, R., and Weigelt, G.

Abstract

The core of the nebula surrounding Eta Carinae has recently been observed with VLT/NACO, VLTI/VINCI, VLTI/MIDI and VLTI/AMBER in order to spatially and spectrally constrain the warm dusty environment and the central object. Narrow-band images at 3.74 μm and 4.05 μm reveal the structured butterfly-shaped dusty environment close to the central star with an unprecedented spatial resolution of about 60 mas. VINCI has resolved the present-day stellar wind of Eta Carinae on a scale of several stellar radii owing to the spatial resolution of the order of 5 mas (~ 11 AU). The VINCI observations show that the object is elongated with a de-projected axis ratio of approximately 1.5. Moreover the major axis is aligned with that of the large bipolar nebula that was ejected in the 19th century. Fringes have also been obtained in the Mid-IR with MIDI using baselines of 75m. A peak of correlated flux of 100 Jy is detected 0.3" south-east from the photocenter of the nebula at 8.7 μm is detected. This correlated flux is partly attributed to the central object but it is worth noting that at these wavelengths, virtually all the 0.5" x 0.5" central area can generate detectable fringes witnessing the large clumping of the dusty ejecta. These observations provide an upper limit for the SED of the central source from 3.8 μm to 13.5 μm and constrain some parameters of the stellar wind which can be compared to Hillier's model. Lastly, we present the great potential of the AMBER instrument to study the numerous near-IR emissive lines from the star and its close vicinity. In particular, we discuss its ability to detect and follow the faint companion. [ABSTRACT FROM AUTHOR]

Published
2008
Full Text
View/download PDF

15. Spatially resolved spectroscopy of infrared companions to T Tauri stars.

Author

Araki, H., Brézin, E., Ehlers, J., Frisch, U., Hepp, K., Jaffe, R. L., Kippenhahn, R., Weidenmüller, H. A., Wess, J., Zittartz, J., Beiglböck, W., Beckwith, Steven, Staude, Jakob, Quetz, Axel, Natta, Antonella, Herbst, T. M., Koresko, C. D., and Leinert, Christoph

Abstract

We describe the technique of spatially resolved spectroscopy of close binary stars and present K band spectra of the Haro 6-10 and UY Aur infrared companion (IRC) systems. The IRC's are characterized by very low infrared colour temperature and high luminosity. Our observations address the debate between those who suggest that the IRC's are at an earlier evolutionary stage than their primary stars, and those who believe that these objects are relatively normal pre-main-sequence stars with substantial local extinction and accreting matter. In both Haro 6-10 and UY Aur, we detect 2 μm molecular hydrogen emission confined to the infrared companions. The line ratios are consistent with shock heating, strengthening the view that the IRC's are experiencing ongoing accretion. In the case of UY Aur, non-spherical geometry, such as accretion onto a circumstellar disk, can explain the presence of molecular hydrogen emission, low effective temperature, and high luminosity while allowing moderate extinction to the photosphere at near infrared wavelengths. [ABSTRACT FROM AUTHOR]

Published
1996
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results