Results 71 to 80 of about 6,211 (193)

A New Sample of Cool Subdwarfs from SDSS: Properties and Kinematics [PDF]

, 2014
We present a new sample of M subdwarfs compiled from the 7th data release of the Sloan Digital Sky Survey. With 3517 new subdwarfs, this new sample significantly increases the number of spectroscopically confirmed low-mass subdwarfs.
Andrew A. West, Antonia S. Savcheva, Bessell, Binney, Bochanski, Bochanski, Bochanski, Boeshaar, Burgasser, Costa, Covey, Dhital, Espinosa Contreras, Faherty, Fuchs, Gizis, Ivezić, Jao, Jao, Jao, John J. Bochanski, Kirkpatrick, Kirkpatrick, Kowalski, Laughlin, Luyten, Lépine, Lépine, Lépine, Lépine, Lépine, Mann, Monteiro, Morgan, Munn, Munn, Murray, Reid, Reid, Schlegel, Schmidt, Skrutskie, Subasavage, Subasavage, West, West, West, West, York   +48 more
core   +3 more sources

Volume-limited sample of low-mass red giant stars, the progenitors of hot subdwarf stars I. Sample selection and binary classification method [PDF]

, 2022
Murat Uzundag, M. I. Jones, M. Vučković, J. Vos, Alexey Bobrick, C. Paladini   +5 more
openalex   +1 more source

New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs

The Astrophysical Journal
We report the results of a spectroscopic survey of candidate T subdwarfs identified by the Backyard Worlds: Planet 9 program. Near-infrared spectra of 31 sources with red J  − W2 colors and large J -band reduced proper motions show varying signatures of ...
Adam J. Burgasser, Adam C. Schneider, Aaron M. Meisner, Dan Caselden, Chih-Chun Hsu, Roman Gerasimov, Christian Aganze, Emma Softich, Preethi Karpoor, Christopher A. Theissen, Hunter Brooks, Thomas P. Bickle, Jonathan Gagné, Ètienne Artigau, Michaël Marsset, Austin Rothermich, Jacqueline K. Faherty, J. Davy Kirkpatrick, Marc J. Kuchner, Nikolaj Stevnbak Andersen, Paul Beaulieu, Guillaume Colin, Jean Marc Gantier, Leopold Gramaize, Les Hamlet, Ken Hinckley, Martin Kabatnik, Frank Kiwy, David W. Martin, Diego H. Massat, William Pendrill, Arttu Sainio, Jörg Schümann, Melina Thévenot, Jim Walla, Zbigniew Wędracki, The Backyard Worlds: Planet 9 Collaboration   +36 more
doaj   +1 more source

Microscopic diffusion and subdwarfs

, 1999
The recent distance determinations by HIPPARCOS have allowed to locate very precisely a reasonable set of subdwarfs in the HR diagram. A detailed comparison with evolutionary models is now possible and it has been recently claimed that the observed lower part of the main-sequence is cooler than the computed one.
Morel, P., Baglin, A.
openaire   +2 more sources

The hot subdwarfs revisited

The Astrophysical Journal, 1982
The properties and evolutionary status of the hot B and O subdwarfs are reinvestigated using recent homogeneous grids of hot, high-gravity model atmospheres and detailed convective envelope calculations appropriate to the hot subdwarf region of the H-R diagram discussed by Greenstein and Sargent.
F. Wesemael, D. E. Winget, W. Cabot, H. M. van Horn, G. Fontaine   +4 more
openaire   +1 more source

Astroserver – Research Services in the Stellar Webshop

Open Astronomy, 2017
A quick look at research and development in astronomy shows that we live in exciting times. Exoplanetary systems, supernovae, and merging binary black holes were far out of reach for observers two decades ago and now such phenomena are recorded routinely.
Németh Péter
doaj   +1 more source

A search for variable subdwarf B stars in TESS Full Frame Images – II. Variable objects in the northern ecliptic hemisphere [PDF]

, 2021
A. S. Baran, S K Sahoo, S Sanjayan, Jakub Ostrowski   +3 more
openalex   +1 more source

Discovery of 118 New Ultracool Dwarf Candidates Using Machine-learning Techniques

The Astronomical Journal
We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine-learning tool, named SMDET , applied to time-series images from the Wide-field Infrared Survey Explorer.
Hunter Brooks, Dan Caselden, J. Davy Kirkpatrick, Yadukrishna Raghu, Charles A. Elachi, Jake Grigorian, Asa Trek, Andrew Washburn, Hiro Higashimura, Aaron M. Meisner, Adam C. Schneider, Jacqueline K. Faherty, Federico Marocco, Christopher R. Gelino, Jonathan Gagné, Thomas P. Bickle, Shih-Yun Tang, Austin Rothermich, Adam J. Burgasser, Marc J. Kuchner, Paul Beaulieu, John Bell, Guillaume Colin, Giovanni Colombo, Alexandru Dereveanco, Deiby Pozo Flores, Konstantin Glebov, Leopold Gramaize, Les Hamlet, Ken Hinckley, Martin Kabatnik, Frank Kiwy, David W. Martin, Raúl F. Palma Méndez, Billy Pendrill, Lizzeth Ruiz, John Sanchez, Arttu Sainio, Jörg Schümann, Manfred Schonau, Christopher Tanner, Nikolaj Stevnbak, Andres Stenner, Melina Thévenot, Vinod Thakur, Nikita V. Voloshin, Zbigniew Wȩdracki, The Backyard Worlds: Planet 9 Collaboration   +47 more
doaj   +1 more source

Summary of Eighth Meeting on Hot Subdwarfs and Related Objects

Open Astronomy, 2017
Subjects discussed during the Eighth Meeting on Hot Subdwarfs and Related Objects are summarised. In particular, a succinct presentation is given of challenges to stellar evolution arising from recent observations.
Lynas-Gray Anthony Eugene
doaj   +1 more source

SSSPM J1444-2019: an extremely high proper motion, ultracool subdwarf

, 2004
We present the discovery of a new extreme high proper motion object (3.5 arcsec/year) which we classify as an ultracool subdwarf with [M/H] = -0.5. It has a formal spectral type of sdM9 but also shows L-type features: while the VO bands are completely ...
Baraffe, Baraffe, Burgasser, Burgasser, Chiba, Digby, Epchtein, Gizis, Hambly, Hambly, Johnson, Lépine, M. J. McCaughrean, McCaughrean, N. Lodieu, R.-D. Scholz, Reid, Scholz, Scholz, Scholz, Teegarden, Tinney, Tinney   +22 more
core   +1 more source