Results 1 to 10 of about 2,636,588 (34)

3D Morphology of Open Clusters in the Solar Neighborhood with Gaia EDR 3. II. Hierarchical Star Formation Revealed by Spatial and Kinematic Substructures [PDF]

Astrophysical Journal, 2022
We identify members of 65 open clusters in the solar neighborhood using the machine-learning algorithm StarGO based on Gaia EDR3 data. After adding members of 20 clusters from previous studies we obtain 85 clusters, and study their morphology and ...
X. Pang, S. Tang, Yuqian Li, Zeqiu Yu, Long Wang, Jiayu Li, Yezhang Li, Yifan Wang, Yanshu Wang, Teng Zhang, M. Pasquato, Massimo Villata Department of High Energy Physics, Xi'an Jiaotong-Liverpool University, Shanghai Key Laboratory for Astrophysics, Shanghai Normal University, L. Observatory, D. O. Astronomy, P. Sciences, Northern Arizona University, S. O. Physics, Astronomy, Sun Yat-sen University, Center for Astro, Particle, P. Physics, N. Y. U. A. Dhabi, I. Padova   +26 more
semanticscholar   +1 more source

The Palomar Transient Factory Core-collapse Supernova Host-galaxy Sample. I. Host-galaxy Distribution Functions and Environment Dependence of Core-collapse Supernovae [PDF]

Astrophysical Journal Supplement Series, 2020
Several thousand core-collapse supernovae (CCSNe) of different flavors have been discovered so far. However, identifying their progenitors has remained an outstanding open question in astrophysics.
S. Schulze, O. Yaron, J. Sollerman, G. Leloudas, A. Gal, A. Wright, R. Lunnan, A. Gal-yam, E. Ofek, D. Perley, A. Filippenko, M. Kasliwal, S. Kulkarni, J. Neill, P. Nugent, R. Quimby, M. Sullivan, N. Strotjohann, I. Arcavi, S. Ben-Ami, F. Bianco, J. Bloom, K. De, M. Fraser, C. Fremling, A. Horesh, J. Johansson, P. Kelly, N. Knežević, S. Knežević, K. Maguire, A. Nyholm, S. Papadogiannakis, T. Petrushevska, A. Rubin, Lin Yan, Yi Yang, S. Adams, F. Bufano, K. Clubb, R. Foley, Yoav Green, J. Harmanen, A. Ho, I. Hook, G. Hosseinzadeh, D. Howell, A. Kong, R. Kotak, T. Matheson, C. McCully, D. Milisavljevic, Yen-Chen Pan, D. Poznanski, I. Shivvers, S. van Velzen, K. Verbeek   +56 more
semanticscholar   +1 more source

NGTS-10b: the shortest period hot Jupiter yet discovered [PDF]

Monthly notices of the Royal Astronomical Society, 2019
We report the discovery of a new ultrashort period (USP) transiting hot Jupiter from the Next Generation Transit Survey (NGTS). NGTS-10b has a mass and radius of $2.162\, ^{+0.092}_{-0.107}$ MJ and $1.205\, ^{+0.117}_{-0.083}$ RJ and orbits its host ...
J. McCormac, E. Gillen, J. Jackman, David J. A. Brown, D. Bayliss, P. Wheatley, R. West, D. Anderson, David J Armstrong, F. Bouchy, J. Briegal, M. Burleigh, J. Cabrera, S. Casewell, A. Chaushev, B. Chazelas, P. Chote, B. Cooke, J. Costes, S. Csizmadia, P. Eigmuller, A. Erikson, E. Foxell, B. Gaensicke, M. Goad, M. Gunther, S. Hodgkin, M. Hooton, J. Jenkins, Gregory Lambert, M. Lendl, E. Longstaff, T. Louden, M. Moyano, L. Nielsen, D. Pollacco, D. Queloz, H. Rauer, L. Raynard, Alexis M. S. Smith, B. Smalley, M. Soto, O. Turner, S. Udry, J. Vines, S. Walker, Christopher A. Watson Centre for Exoplanets, Habitability, U. Warwick, Coventry CV4 7AL, U. D. O. Physics, UK Astrophysics Group, C. Laboratory, Cambridge, UK Observatoire de Geneve, U. Geneve, Sauverny, S. D. O. Physics, Astronomy, U. Leicester, University Road, Leicester, LE1 7RH, UK Institute of Planetary Research, German Aerospace Center, 2. Rutherfordstrasse, 12489 Berlin, G. Astronomy, Astrophysics, Tu Berlin, Berlin, G. D. O. Physics, Kavli Institute for Astrophysics, S. Research, M. I. O. Technology, MA 02139, Usa Institute for Astronomy, U. Cambridge, Madingley Road, Cambridge CB3 0HA, UK Astrophysics Research Centre, S. O. Mathematics, Physics, Queen's University of Belfast, BT7 1NN Belfast, UK Departamento de Astronomia, U. D. Chile, Casilla, Santiago, Chile Centro de Astrof'isica y Tecnolog'ias Afines, C. I. D. Astronom'ia, Universidad Cat'olica del Norte, Angamos, Antofagasta, Chile Institute of Geological Sciences, F. Berlin, Germany Astrophysics Group, Keele University, S. 5BG, UK Department of Mathematical Sciences, S. R. Institute, Austria Juan Carlos Torres Fellow   +101 more
semanticscholar   +1 more source

Stellar laboratories: new Ge V and Ge VI oscillator strengths and their validation in the hot white dwarf RE 0503–289 [PDF]

, 2012
Context. State-of-the-art spectral analysis of hot stars by means of non-LTE model-atmosphere techniques has arrived at a high level of sophistication. The analysis of high-resolution and high-S/N spectra, however, is strongly restricted by the lack of ...
T. Rauch, K. Werner, É. Biémont, P. Quinet, J. W. I. F. Astronomy, Astrophysics, K. C. F. Astro, P. Physics, E. University, Tuebingen, H Germany, Astrophysique et Spectroscopie, Universit'e de Mons, Mons, Belgium, Ipnas, U. Liege, Sart Tilman, Liège, Nasa Goddard Space Flight Center, Greenbelt, Md, Usa   +22 more
semanticscholar   +1 more source

The virtual observatory service TheoSSA: Establishing a database of synthetic stellar flux standards - I. NLTE spectral analysis of the DA-type white dwarf G191−B2B [PDF]

, 2013
Hydrogen-rich, DA-type white dwarfs are particularly suited as primary standard stars for flux calibration. State-of-the-art NLTE models consider opacities of species up to trans-iron elements and provide reliable synthetic stellar-atmosphere spectra to ...
T. Rauch, R. Bohlin, J. Kruk, K. W. I. F. Astronomy, Astrophysics, K. C. F. Astro, P. Physics, E. University, Tuebingen, Germany, Space Telescope Science Institute, Baltimore, Md, Usa, Nasa Goddard Space Flight Center, Greenbelt   +15 more
semanticscholar   +1 more source

Circumstellar discs in Galactic centre clusters: Disc-bearing B-type stars in the Quintuplet and Arches clusters [PDF]

, 2015
Astronomy & Astrophysics manuscript no. discs_astro_11feb2014 February 13, 2015 c ESO Circumstellar discs in Galactic centre clusters: Disc-bearing B-type stars in the Quintuplet and Arches clusters ? A. Stolte 1 , B. Husmann 1 , C.
A. Stolte, B. Hussmann, C. Olczak, W. Brandner, M. Habibi, A. Ghez, M. Morris, Jessica R. Lu, W. Clarkson, Jay Anderson   +9 more
semanticscholar   +1 more source

BD–22°3467, a DAO-type star exciting the nebula Abell 35 [PDF]

, 2012
Context. Spectral analyses of hot, compact stars with non-local thermodynamical equilibrium (NLTE) model-atmosphere techniques allow the precise determination of photospheric parameters such as the effective temperature (Teff), the surface gravity (log g)
M. Ziegler, T. Rauch, K. Werner, J. Koeppen, J. W. I. F. Astronomy, Astrophysics, K. C. F. Astro, P. Physics, E. University, Tuebingen, H Germany, O. Strasbourg, U. Strasbourg, Strasbourg, France., Nasa Goddard Space Flight Center, Greenbelt, Md, Usa   +18 more
semanticscholar   +1 more source

Coronal Abundances in Orion Nebula Cluster Stars [PDF]

, 2007
Following the Chandra Orion Ultradeep Project (COUP) observation, we have studied the chemical composition of the hot plasma in a sample of 146 X-ray-bright pre-main-sequence stars in the Orion Nebula Cluster (ONC).
A. Maggio, E. Flaccomio, F. Favata, G. Micela, S. Sciortino, E. Feigelson, K. V. G. I. -. O. A. D. Palermo, Astrophysics Division - Research, Space Science Department of Esa, P. S. University   +9 more
semanticscholar   +1 more source

Linear Solar Models: a simple tool to investigate the properties of solar interior [PDF]

, 2010
We describe a simple method to study the dependence of the solar properties on a generic (small) modification the physical inputs adopted in standard solar models calculations.
arxiv   +1 more source

Helicity--vorticity turbulent pumping of magnetic fields in the solar dynamo [PDF]

, 2012
The interaction of helical convective motions and differential rotation in the solar convection zone results in turbulent drift of a large-scale magnetic field. We discuss the pumping mechanism and its impact on the solar dynamo.
arxiv   +1 more source