scholarly journals Variability of Young Massive Stars in the Arches Cluster

2011 ◽  
Vol 7 (S282) ◽  
pp. 454-455
Author(s):  
K. Markakis ◽  
A. Z. Bonanos ◽  
G. Pietrzynski ◽  
L. Macri ◽  
K. Z. Stanek
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Massive Stars ◽  
Eclipsing Binaries ◽  
Fundamental Parameters ◽  
Preliminary Results ◽  
The Galaxy ◽  
Variability Study ◽  
Massive Cluster ◽  
Rare Opportunity

AbstractWe present preliminary results of the first near-infrared variability study of the Arches cluster, using adaptive optics data from NIRI/Gemini and NACO/VLT. The goal is to discover eclipsing binaries in this young (2.5 ± 0.5 Myr), dense, massive cluster for which we will determine accurate fundamental parameters with subsequent spectroscopy. Given that the Arches cluster contains more than 200 Wolf-Rayet and O-type stars, it provides a rare opportunity to determine parameters for some of the most massive stars in the Galaxy.

scholarly journals Variability of young massive stars in the Arches cluster

2010 ◽  
Vol 6 (S272) ◽  
pp. 298-299
Author(s):  
Kostas Markakis ◽  
Alceste Z. Bonanos ◽  
Grzegorz Pietrzynski ◽  
Lucas Macri ◽  
Kris Z. Stanek
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Massive Stars ◽  
Eclipsing Binaries ◽  
Fundamental Parameters ◽  
Preliminary Results ◽  
The Galaxy ◽  
Variability Study ◽  
Massive Cluster ◽  
Rare Opportunity

AbstractWe present preliminary results of the first near-infrared variability study of the Arches cluster, using adaptive optics data from NIRI/Gemini and NACO/VLT. The goal is to discover eclipsing binaries in this young (2.5 ± 0.5 Myr), dense, massive cluster for which we will determine accurate fundamental parameters with subsequent spectroscopy. Given that the Arches cluster contains more than 200 Wolf-Rayet and O-type stars, it provides a rare opportunity to determine parameters for some of the most massive stars in the Galaxy.

scholarly journals Fundamental parameters of 4 massive eclipsing binaries in Westerlund 1

2010 ◽  
Vol 6 (S272) ◽  
pp. 515-516
Author(s):  
Eugenia Koumpia ◽  
Alceste Z. Bonanos
Keyword(s):  
Binary Systems ◽  
Local Group ◽  
Massive Stars ◽  
Eclipsing Binaries ◽  
Fundamental Parameters ◽  
Red Supergiants ◽  
The Masses ◽  
Rare Opportunity ◽  
Luminous Blue Variable

AbstractWesterlund 1 is one of the most massive young clusters known in the Local Group, with an age of 3-5 Myr. It contains an assortment of rare evolved massive stars, such as blue, yellow and red supergiants, Wolf-Rayet stars, a luminous blue variable, and a magnetar, as well as 4 massive eclipsing binary systems (Wddeb, Wd13, Wd36, WR77o, see Bonanos 2007). The eclipsing binaries present a rare opportunity to constrain evolutionary models of massive stars, the distance to the cluster and furthermore, to determine a dynamical lower limit for the mass of a magnetar progenitor. Wddeb, being a detached system, is of great interest as it allows determination of the masses of 2 of the most massive unevolved stars in the cluster. We have analyzed spectra of all 4 eclipsing binaries, taken in 2007-2008 with the 6.5 meter Magellan telescope at Las Campanas Observatory, Chile, and present fundamental parameters (masses, radii) for their component stars.

scholarly journals Fundamental Parameters of Four Massive Eclipsing Binaries in Westerlund 1

2011 ◽  
Vol 7 (S282) ◽  
pp. 307-308
Author(s):  
E. Koumpia ◽  
A. Z. Bonanos
Keyword(s):  
Lower Limit ◽  
Massive Stars ◽  
Eclipsing Binaries ◽  
High Mass ◽  
Evolutionary Models ◽  
Fundamental Parameters ◽  
Massive Cluster

AbstractWe present fundamental parameters of four massive eclipsing binaries in the young massive cluster Westerlund 1. The goal is to measure accurate masses and radii of their component stars, which provide much needed constraints for evolutionary models of massive stars. Accurate parameters can further be used to determine a dynamical lower limit for the magnetar progenitor and to obtain an independent distance to the cluster. Our results confirm and extend the evidence for a high mass for the progenitor of the magnetar.

scholarly journals A High Angular Resolution Survey of Massive Stars in Cygnus OB2: JHK Adaptive Optics Results from the Gemini Near-Infrared Imager

2020 ◽  
Vol 160 (3) ◽  
pp. 115
Author(s):  
S. M. Caballero-Nieves ◽  
D. R. Gies ◽  
E. K. Baines ◽  
A. H. Bouchez ◽  
R. G. Dekany ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution ◽  
Infrared Imager

scholarly journals A survey of the most massive stars in the Magellanic Clouds

2008 ◽  
Vol 4 (S256) ◽  
pp. 343-348
Author(s):  
Alceste Z. Bonanos
Keyword(s):  
Star Formation ◽  
Massive Star ◽  
Massive Stars ◽  
Magellanic Clouds ◽  
Eclipsing Binaries ◽  
Large Impact ◽  
Massive Star Formation ◽  
Fundamental Parameters ◽  
Precise Data ◽  
Formation And Evolution

AbstractDespite the large impact very massive stars (>30 M⊙) have in astrophysics, their fundamental parameters remain uncertain. I present results of a survey aiming to characterize the most massive stars in the Magellanic Clouds. The survey targets the brightest, blue, eclipsing binaries discovered by the OGLE microlensing survey, for which masses and radii are measured to 5%. Such precise data are rare and provide constraints for theories of massive star formation and evolution at low metallicities.

GeMS/GSAOI near-infrared imaging of z ∼ 0.3 BL Lacs

2019 ◽  
Vol 15 (S356) ◽  
pp. 372-372
Author(s):  
Susan Ridgway
Keyword(s):  
High Resolution ◽  
Adaptive Optics ◽  
Galaxy Formation ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Morphological Evidence ◽  
Host Galaxies ◽  
The Galaxy ◽  
Nuclear Component ◽  
Bl Lacs

AbstractBright quasars at low z have generally been found in massive, evolved host galaxies, consistent with formation at early epochs. However, deep, high resolution, multicolor imaging of some quasar hosts have found morphological evidence of tidal tails and colors indicative of active star formation. These results are consistent with theories of galaxy formation and evolution in which merger processes trigger the activation of the quasar phase, and energetic feedback is essential. Understanding the role the black hole population plays in the galaxy formation process is important, but imaging the host galaxies around bright quasars is difficult because of the contribution of the bright nuclei. Very high resolution, deep imaging is necessary to successfully remove the nuclear component. We made high-resolution near-infrared images of several bright z ˜ 0.3 BL Lacs with the Gemini Multi-Conjugate Adaptive Optics System (GeMS)/GSAOI in order to study their host galaxies. We will present the results of this imaging with the 1 arcmin AO-corrected field provided by GeMS/GSAOI and compare with available HST imaging available in the archive.

scholarly journals The Methanol Multibeam Survey

2007 ◽  
Vol 3 (S242) ◽  
pp. 218-222
Author(s):  
James A. Green ◽  
R. J. Cohen ◽  
J. L. Caswell ◽  
G. A. Fuller ◽  
K. Brooks ◽  
...  
Keyword(s):  
Milky Way ◽  
Survey Methodology ◽  
Galactic Plane ◽  
Massive Stars ◽  
Maser Emission ◽  
Methanol Maser ◽  
Preliminary Results ◽  
Systematic Survey ◽  
The Galaxy ◽  
Methanol Masers

AbstractA new 7-beam methanol multibeam receiver is being used to survey the Galaxy for newly forming massive stars, that are pinpointed by strong methanol maser emission at 6.668 GHz. The receiver, jointly constructed by Jodrell Bank Observatory (JBO) and the Australia Telescope National Facility (ATNF), was successfully commissioned at Parkes in January 2006. The Parkes-Jodrell survey of the Milky Way for methanol masers is two orders of magnitude faster than previous systematic surveys using 30-m class dishes, and is the first systematic survey of the entire Galactic plane. The first 53 days of observations with the Parkes telescope have yielded 518 methanol sources, of which 218 are new discoveries. We present the survey methodology as well as preliminary results and analysis.

NIR–IFU observations of the merger remnant NGC 34

2019 ◽  
Vol 15 (S359) ◽  
pp. 355-356
Author(s):  
Juliana C. Motter ◽  
Rogério Riffel ◽  
Tiago V. Ricci ◽  
Natacha Z. Dametto ◽  
Luis G. Dahmer-Hahn ◽  
...  
Keyword(s):  
Galaxy Evolution ◽  
Adaptive Optics ◽  
Near Infrared ◽  
Galactic Nuclei ◽  
Molecular Gas ◽  
The Galaxy ◽  
Open Issue ◽  
Nuclear Regions ◽  
Disc Galaxies ◽  
Integral Field

AbstractUnderstanding the interplay between the phenomena of active galactic nuclei (AGN) and starbursts remains an open issue in studies of galaxy evolution. The galaxy NGC 34 is the remnant of the merger of two former gas-rich disc galaxies and it also hosts a strong nuclear starburst. In this work, we map the ionized and molecular gas present in the nuclear regions of the galaxy NGC 34 using adaptive optics (AO) assisted near infrared (NIR) integral field unity (IFU) observations. Our main goals are to better constrain the energy source of this object and to use NGC 34 as a laboratory to probe the AGN-starburst connection in the context of galaxy evolution and AGN feeding and feedback processes.

scholarly journals Massive infrared clusters in the Milky Way

2016 ◽  
Vol 12 (S329) ◽  
pp. 263-270
Author(s):  
André-Nicolas Chené ◽  
Sebastian Ramírez Alegría ◽  
Jordanka Borissova ◽  
Anthony Hervé ◽  
Fabrice Martins ◽  
...  
Keyword(s):  
Near Infrared ◽  
Milky Way ◽  
Galactic Center ◽  
Massive Stars ◽  
Star Clusters ◽  
Infrared Observations ◽  
Fundamental Parameters ◽  
Dust Extinction ◽  
Young Clusters ◽  
Massive Clusters

AbstractOur position in the Milky Way (MW) is both a blessing and a curse. We are nearby to many star clusters, but the dust that is a product of their very existence obscures them. Also, many massive young clusters are expected to be located near, or across the Galactic Center, where the dust extinction is extreme (AV > 15 mag) and can be better penetrated by infrared photons. This paper reviews the discoveries and the study of new MW massive stars and massive clusters made possible by near infrared observations that are part of the VISTA Variables in the Vía Láctea (VVV) survey. It discusses what the studies of their fundamental parameters have taught us.

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