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12 results on '"Schnurr, O."'

1. The Wolf-Rayet binaries of the nitrogen sequence in the Large Magellanic Cloud

Author

Shenar, T., primary, Sablowski, D. P., additional, Hainich, R., additional, Todt, H., additional, Moffat, A. F. J., additional, Oskinova, L. M., additional, Ramachandran, V., additional, Sana, H., additional, Sander, A. A. C., additional, Schnurr, O., additional, St-Louis, N., additional, Vanbeveren, D., additional, Götberg, Y., additional, and Hamann, W.-R., additional

Published
2020
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2. 4MOST – 4-meter Multi-Object Spectroscopic Telescope

Author

Schnurr O., Chiappini C., and de Jong R.S.

Subjects
Physics, QC1-999
Abstract

The 4MOST consortium aims to provide the ESO community with a fibre-fed spectroscopic survey facility on a 4m-class telescope with a large enough field-of-view (FoV) to survey a large fraction of the southern sky in a few years, a multiplex and spectral resolution high enough to detect chemical and kinematic substructure in the stellar halo, bulge and thin and thick discs of the Milky Way, and enough wavelength coverage (>1.5 octave) to secure velocities of extra-galactic objects over a large range in redshift. 4MOST will run permanently on the selected telescope to perform a 5 year public survey yielding more than 7 million (goal >25 million) spectra at resolution R∼5000 and more than 1 million spectra at R≳20,000. Such an exceptional facility enables many science goals, but our design is especially intended to complement three key all-sky, space-based observatories of prime European interest: Gaia, eROSITA and Euclid.

Published
2012
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3. The Wolf–Rayet binaries of the nitrogen sequence in the Large Magellanic Cloud

Author

Shenar, T., primary, Sablowski, D. P., additional, Hainich, R., additional, Todt, H., additional, Moffat, A. F. J., additional, Oskinova, L. M., additional, Ramachandran, V., additional, Sana, H., additional, Sander, A. A. C., additional, Schnurr, O., additional, St-Louis, N., additional, Vanbeveren, D., additional, Götberg, Y., additional, and Hamann, W.-R., additional

Published
2019
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4. A RAVE investigation on Galactic open clusters

Author

Conrad, C., primary, Scholz, R.-D., additional, Kharchenko, N. V., additional, Piskunov, A. E., additional, Röser, S., additional, Schilbach, E., additional, de Jong, R. S., additional, Schnurr, O., additional, Steinmetz, M., additional, Grebel, E. K., additional, Zwitter, T., additional, Bienaymé, O., additional, Bland-Hawthorn, J., additional, Gibson, B. K., additional, Gilmore, G., additional, Kordopatis, G., additional, Kunder, A., additional, Navarro, J. F., additional, Parker, Q., additional, Reid, W., additional, Seabroke, G., additional, Siviero, A., additional, Watson, F., additional, and Wyse, R., additional

Published
2017
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5. The Wolf-Rayet stars in the Large Magellanic Cloud

Author

Hainich, R., primary, Rühling, U., additional, Todt, H., additional, Oskinova, L. M., additional, Liermann, A., additional, Gräfener, G., additional, Foellmi, C., additional, Schnurr, O., additional, and Hamann, W.-R., additional

Published
2014
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7. Massive open star clusters using the VVV survey

Author

Chené, A.-N., primary, Borissova, J., additional, Bonatto, C., additional, Majaess, D. J., additional, Baume, G., additional, Clarke, J. R. A., additional, Kurtev, R., additional, Schnurr, O., additional, Bouret, J.-C., additional, Catelan, M., additional, Emerson, J. P., additional, Feinstein, C., additional, Geisler, D., additional, de Grijs, R., additional, Hervé, A., additional, Ivanov, V. D., additional, Kumar, M. S. N., additional, Lucas, P., additional, Mahy, L., additional, Martins, F., additional, Mauro, F., additional, Minniti, D., additional, and Moni Bidin, C., additional

Published
2013
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10. Gemini GMOS spectroscopy of HeII nebulae in M 33

Author

Kehrig, C., primary, Oey, M. S., additional, Crowther, P. A., additional, Fogel, J., additional, Pellegrini, E., additional, Schnurr, O., additional, Schaerer, D., additional, Massey, P., additional, and Roth, K., additional

Published
2011
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11. An overlooked brown dwarf neighbour (T7.5 at d ~ 5 pc) of the Sun and two additional T dwarfs at about 10 pc.

Author

Bihain, G., Scholz, R.-D., Storm, J., and Schnurr, O.

Subjects
BROWN dwarf stars, INFRARED spectroscopy, WAVELENGTHS, KINEMATICS, SOLAR activity
Abstract

Context. Although many new brown dwarf (BD) neighbours have recently been discovered thanks to new sky surveys in the mid- and near-infrared (MIR, NIR), their numbers are still more than five times lower than those of stars in the same volume. Aims. Our aim is to detect and classify new BDs to eventually complete their census in the immediate solar neighbourhood. Methods. We combined multi-epoch data from sky surveys at diffrent wavelengths to detect BD neighbours of the Sun by their high proper motion (HPM). We concentrated on relatively bright MIR (w2 < 13:5) BD candidates from the Wide-field Infrared Survey Explorer (WISE) expected to be so close to the Sun that they may also be seen in older NIR (Two Micron All Sky Survey - 2MASS -; DEep Near-Infrared Survey - DENIS) or even red optical (Sloan Digital Sky Survey (SDSS) i- and z-band, SuperCOSMOS Sky Surveys (SSS) I-band) surveys. With low-resolution NIR spectroscopy we classified the new BDs and estimated their distances and velocities. Results. We have discovered the HPM (μ ~ 470 mas/yr) T7.5 dwarf, WISE J0521+1025, which is at d = 5:0 ± 1:3 pc from the Sun the nearest known T dwarf in the northern sky, and two early T dwarfs, WISE J0457--0207 (T2) and WISE J2030+0749 (T1.5), with proper motions of ~120 and ~670 mas/yr and distances of 12.5 ± 3.1 pc and 10.5 ± 2.6 pc, respectively. The last one was independently discovered and also classified as a T1.5 dwarf by Mace and coworkers. All three show thin disc kinematics. They may have been overlooked in the past owing to overlapping images and because of problems with matching objects between different surveys and measuring their proper motions. [ABSTRACT FROM AUTHOR]

Published
2013
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12. 4MOST - 4-meter Multi-Object Spectroscopic Telescope.

Author

de Jong, R. S., Chiappini, C., and Schnurr, O.

Subjects
STELLAR structure, MILKY Way, TELESCOPES, SPECTRUM analysis, STELLAR spectra, WAVELENGTHS, REDSHIFT
Abstract

The 4MOST consortium aims to provide the ESO community with a fibre-fed spectroscopic survey facility on a 4m-class telescope with a large enough field-of-view (FoV) to survey a large fraction of the southern sky in a few years, a multiplex and spectral resolution high enough to detect chemical and kinematic substructure in the stellar halo, bulge and thin and thick discs of the Milky Way, and enough wavelength coverage (>1.5 octave) to secure velocities of extra-galactic objects over a large range in redshift. 4MOST will run permanently on the selected telescope to perform a 5 year public survey yielding more than 7 million (goal >25 million) spectra at resolution R~5000 and more than 1 million spectra at R≳20, 000. Such an exceptional facility enables many science goals, but our design is especially intended to complement three key all-sky, space-based observatories of prime European interest: Gaia, eROSITA and Euclid. [ABSTRACT FROM AUTHOR]

Published
2012
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