Zobrazeno 1 - 10
of 107
pro vyhledávání: '"Harper, G. M."'
Autor:
O'Gorman, E., Harper, G. M., Ohnaka, K., Feeney-Johansson, A., Wilkeneit-Braun, K., Brown, A., Guinan, E. F., Lim, J., Richards, A. M. S., Ryde, N., Vlemmings, W. H. T.
We first present spatially resolved ALMA and VLA continuum observations of the early-M red supergiant Antares to search for the presence of a chromosphere at radio wavelengths. We resolve the free-free emission of the Antares atmosphere at 11 unique
Externí odkaz:
http://arxiv.org/abs/2006.08023
Autor:
Montargès, M., Homan, W., Keller, D., Clementel, N., Shetye, S., Decin, L., Harper, G. M., Royer, P., Winters, J. M., Bertre, T. Le, Richards, A. M. S.
Publikováno v:
MNRAS 485, 2417 (2019)
Red supergiant stars are surrounded by a gaseous and dusty circumstellar environment created by their mass loss which spreads heavy elements into the interstellar medium. The structure and the dynamics of this envelope are crucial to understand the p
Externí odkaz:
http://arxiv.org/abs/1903.07129
Akademický článek
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Autor:
O'Gorman, E., Kervella, P., Harper, G. M., Richards, A. M. S., Decin, L., Montargès, M., McDonald, I.
The mechanisms responsible for heating the extended atmospheres of early-M spectral-type supergiants are poorly understood. So too is the subsequent role these mechanisms play in driving the large mass-loss rates of these stars. Here we present ALMA
Externí odkaz:
http://arxiv.org/abs/1706.06021
Autor:
Harper, G. M., Brown, A., Guinan, E. F., O'Gorman, E., Richards, A. M. S., Kervella, P., Decin, L.
We provide an update for the astrometric solution for the Type II supernova progenitor Betelgeuse using the revised Hipparcos Intermediate Astrometric Data (HIAD) of van Leeuwen, combined with existing VLA and new e-MERLIN and ALMA positions. The 200
Externí odkaz:
http://arxiv.org/abs/1706.06020
Autor:
Indriolo, Nick, Neufeld, D. A., DeWitt, C. N., Richter, M. J., Boogert, A. C. A., Harper, G. M., Jaffe, D. T., Kulas, K. R., McKelvey, M. E., Ryde, N., Vacca, W.
Publikováno v:
ApJ 802 (2015) L14
We present high spectral resolution (~3 km/s) observations of the nu_2 ro-vibrational band of H2O in the 6.086--6.135 micron range toward the massive protostar AFGL 2591 using the Echelon-Cross-Echelle Spectrograph (EXES) on the Stratospheric Observa
Externí odkaz:
http://arxiv.org/abs/1502.06611
Autor:
Ryde, N., Lambert, J., Farzone, M., Richter, M. J., Josselin, E., Harper, G. M., Eriksson, K., Greathouse, T. K.
Publikováno v:
A&A 573, A28 (2015)
The structures of the outer atmospheres of red giants are very complex. The notion of large optically thick molecular spheres around the stars (MOLspheres) has been invoked in order to explain e.g. spectro-interferometric observations. However, high-
Externí odkaz:
http://arxiv.org/abs/1410.3999
Autor:
O'Gorman, E., Vlemmings, W., Richards, A. M. S., Baudry, A., De Beck, E., Decin, L., Harper, G. M., Humphreys, E. M., Kervella, P., Khouri, T., Muller, S.
Publikováno v:
A&A 573, L1 (2015)
The processes leading to dust formation and the subsequent role it plays in driving mass loss in cool evolved stars is an area of intense study. Here we present high resolution ALMA Science Verification data of the continuum emission around the highl
Externí odkaz:
http://arxiv.org/abs/1410.1622
Autor:
Richards, A. M. S., Impellizzeri, C. M. V., Humphreys, E. M., Vlahakis, C., Vlemmings, W., Baudry, A., De Beck, E., Decin, L., Etoka, S., Gray, M. D., Harper, G. M., Hunter, T. R., Kervella, P., Kerschbaum, F., McDonald, I., Melnick, G., Muller, S., Neufeld, D., O'Gorman, E., Parfenov, S. Yu., Peck, A. B., Shinnaga, H., Sobolev, A. M., Testi, L., Uscanga, L., Wootten, A., Yates, J. A., Zijlstra, A.
Publikováno v:
A&A 572, L9 (2014)
Cool, evolved stars have copious, enriched winds. The structure of these winds and the way they are accelerated is not well known. We need to improve our understanding by studying the dynamics from the pulsating stellar surface to about 10 stellar ra
Externí odkaz:
http://arxiv.org/abs/1409.5497
Autor:
Ryde, N., Lambert, J., Richter, M. J., Josselin, E., Harper, G. M., Eriksson, K., Boogert, A., DeWitt, C., Encrenaz, T., Greathouse, T., Jaffe, D., Kulas, K., McKelvey, M., Najita, J., Vacca, W.
The physical structures of the outer atmospheres of red giants are not known. They are certainly complex and a range of recent observations are showing that we need to embrace to non-classical atmosphere models to interpret these regions. This region
Externí odkaz:
http://arxiv.org/abs/1408.6055