Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Acker, AGNès"'
Publikováno v:
A&A 570, A105 (2014)
Ou4 is a recently discovered bipolar outflow with a projected size of more than one degree in the plane of the sky. It is apparently centred on the young stellar cluster -whose most massive representative is the triple system HR8119- inside the HII r
Externí odkaz:
http://arxiv.org/abs/1407.4617
Autor:
Miszalski, Brent, Crowther, Paul A., De Marco, Orsola, Köppen, Joachim, Moffat, Anthony F. J., Acker, Agnès, Hillwig, Todd C.
Several [WC]-type central stars of planetary nebulae (PNe) are known to mimic the spectroscopic appearance of massive carbon-rich or WC-type Wolf-Rayet stars. In stark contrast, no [WN]-type central stars have yet been identified as clear-cut analogu
Externí odkaz:
http://arxiv.org/abs/1210.0562
Autor:
Acker, Agnes, Boffin, Henri M. J., Outters, Nicolas, Miszalski, Brent, Sabin, Laurence, Du, Pascal Le, Alves, Filipe
We present the discovery of 6 nebular objects made by amateur astronomers. Four of these discoveries are clearly planetary nebulae (PNe), one is a possible PN, and another is a likely H II region. The bipolar nebula Ou4 presents the largest angular e
Externí odkaz:
http://arxiv.org/abs/1206.2477
Autor:
DePew, Kyle, Parker, Quentin A., Miszalski, Brent, De Marco, Orsola, Frew, David J., Acker, Agnes, Kovacevic, Anna V., Sharp, Rob G.
We present spectra of 32 previously unpublished confirmed and candidate Wolf-Rayet ([WR]) and weak emission-line (WELS) central stars of planetary nebulae (CSPNe). Eighteen stars have been discovered in the Macquarie/AAO/Strasbourg H-Alpha (MASH) PN
Externí odkaz:
http://arxiv.org/abs/1101.2468
Autor:
Jacoby, George H., Kronberger, Matthias, Patchick, Dana, Teutsch, Philipp, Saloranta, Jaakko, Howell, Michael, Crisp, Richard, Riddle, Dave, Acker, Agnés, Frew, David J., Parker, Quentin
Recent Halpha surveys such as SHS and IPHAS have improved the completeness of the Galactic planetary nebula (PN) census. We now know of ~3,000 PNe in the Galaxy, but this is far short of most estimates, typically ~25,000 or more for the total populat
Externí odkaz:
http://arxiv.org/abs/0910.0465
Autor:
Chesneau, Olivier, Collioud, Arnaud, De Marco, Orsola, Wolf, Sebastian, Lagadec, Eric, Zijlstra, Albert A., Rothkopf, Alexander, Acker, AGNès, Clayton, Geoff C., Lopez, B.
We present high spatial resolution observations of the dusty core of the Planetary Nebula with Wolf-Rayet central star CPD-568032. These observations were taken with the mid-infrared interferometer VLTI/MIDI in imaging mode providing a typical 300 ma
Externí odkaz:
http://arxiv.org/abs/astro-ph/0606745
Autor:
Lagadec, Eric, Chesneau, Olivier, Matsuura, Mikako, De Marco, Orsola, Pacheco, Jose Antonio De Freitas, Zijlstra, Albert, Acker, Agnès, Clayton, Geoffrey
We report infrared observations of the planetary nebula Hen 2-113 obtained with VLT/NACO, VLTI/MIDI, VLT/ISAAC and TIMMI at the ESO 3.6m. Hen 2-113 exhibits a clear ring-like structure superimposed to a more diffuse environment visible in the L' (3.8
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509014
Autor:
Parker, Quentin A, Acker, Agnes
The ability to identify and distinguish between the wide variety of celestial objects benefits from application of a systematic and logical nomenclature. This often includes value-added information within the naming convention which can aid in placin
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412177
Publikováno v:
Astron.Astrophys.400:957-970,2003
This paper discusses the location of a sample of planetary nebulae on the HR diagram. We determine the internal velocity fields of 14 planetary nebulae from high-resolution echelle spectroscopy, with the help of photoionization models. The mass avera
Externí odkaz:
http://arxiv.org/abs/astro-ph/0301393
Autor:
Grosdidier, Yves, Moffat, Anthony F. J., Blais-Ouellette, Sébastien, Joncas, Gilles, Acker, Agnès
With HST-WFPC2 we have obtained a deep, H-alpha image of the WR nebula M1-67. With the interferometer of the Universite Laval (Quebec, Canada), we have obtained complementary Fabry-Perot H-alpha data using CFHT MOS/SIS. On the deep H-alpha image we h
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107489