Results 51 to 60 of about 12,083,844 (366)

Dwarfs and Dwarf Worship [PDF]

Nature, 1892
IN the slow course of post in this Protectorate I have just received copies of the Times of September 3 containing Mr. R. G. Halliburton's paper on “Dwarf Races and Dwarf Worship,” and of September 14 and 22, containing subsequent correspondence on the same subject.
openaire   +3 more sources

A TARGETED SEARCH FOR PECULIARLY RED L AND T DWARFS IN SDSS, 2MASS, AND WISE: DISCOVERY OF A POSSIBLE L7 MEMBER OF THE TW HYDRAE ASSOCIATION [PDF]

, 2015
We present the first results from a targeted search for brown dwarfs with unusual red colors indicative of peculiar atmospheric characteristics. These include objects with low surface gravities or with unusual dust content or cloud properties.
K. Kellogg, K. Kellogg, S. Metchev, S. Metchev, K. Geissler, S. Hicks, J. Kirkpatrick, R. Kurtev, R. Kurtev   +8 more
semanticscholar   +1 more source

The First Y Dwarf Data from JWST Show that Dynamic and Diabatic Processes Regulate Cold Brown Dwarf Atmospheres

The Astrophysical Journal, 2023
The James Webb Space Telescope (JWST) is now observing Y dwarfs, the coldest known brown dwarfs, with effective temperatures T _eff ≲ 475 K. The first published observations provide important information: not only is the atmospheric chemistry out of ...
S. K. Leggett, Pascal Tremblin
doaj   +1 more source

SATELLITE DWARF GALAXIES IN A HIERARCHICAL UNIVERSE: THE PREVALENCE OF DWARF-DWARF MAJOR MERGERS [PDF]

The Astrophysical Journal, 2014
Mergers are a common phenomenon in hierarchical structure formation, especially for massive galaxies and clusters, but their importance for dwarf galaxies in the Local Group remains poorly understood. We investigate the frequency of major mergers between dwarf galaxies in the Local Group using the ELVIS suite of cosmological zoom-in dissipationless ...
Alis J. Deason, Andrew Wetzel, Andrew Wetzel, Shea Garrison-Kimmel   +3 more
openaire   +6 more sources

WIYN Open Cluster Study 89. M48 (NGC 2548) 2: Lithium Abundances in the 420 Myr Open Cluster M48 from Giants through K Dwarfs

The Astrophysical Journal, 2023
We consider WIYN/Hydra spectra of 329 photometric candidate members of the 420 Myr old open cluster M48 and report lithium detections or upper limits for 234 members and likely members.
Qinghui Sun, Constantine P. Deliyannis, Aaron Steinhauer, Barbara J. Anthony-Twarog, Bruce A. Twarog   +4 more
doaj   +1 more source

The Spectra of T Dwarfs I: Near-Infrared Data and Spectral Classification [PDF]

, 2001
We present near-infrared spectra for a sample of T dwarfs, including eleven new discoveries made using the Two Micron All Sky Survey. These objects are distinguished from warmer (L-type) brown dwarfs by the presence of methane absorption bands in the 1 ...
Adam Burrows, Adam J. Burgasser, Bailer-Jones C. A. L., Chabrier G., Conard C. Dahn, Cuby J. G., David G. Monet, Delfosse X., Epchtein N., Goldman B., Hawkins M. R. S., I. Neill Reid, J. Davy Kirkpatrick, James Liebert, John E. Gizis, Jones H. R. A., Keith Matthews, Michael E. Brown, Michael F. Skrutskie, Morgan W., Nakajima T., Olivia E., Pickering E. C., Roc M. Cutri, Tsuji T., Tsuji T., Wolf C.   +26 more
core   +5 more sources

Methane and ammonia in the near-infrared spectra of late-T dwarfs [PDF]

, 2015
Analysis of T dwarfs using model atmospheres has been hampered by the absence of reliable line lists for methane and ammonia. Newly computed high temperature line lists for both of these important molecules are now available, so it is timely to ...
J. Canty, P. Lucas, S. Yurchenko, J. Tennyson, S. Leggett, C. Tinney, H. Jones, B. Burningham, D. Pinfield, R. Smart   +9 more
semanticscholar   +1 more source

Investigating Possible Binarity for GJ 229B

The Astrophysical Journal Letters, 2023
GJ 229B, the first type-T brown dwarf to be discovered, has presented a tension between comparisons with evolutionary models and the larger-than-expected mass and radius values derived from spectroscopic and astrometric observations.
Alex R. Howe, Avi M. Mandell, Michael W. McElwain   +2 more
doaj   +1 more source

Time-resolved Optical Polarization Monitoring of the Most Variable Brown Dwarf

The Astronomical Journal, 2023
Recent atmospheric models for brown dwarfs suggest that the existence of clouds in substellar objects is not needed to reproduce their spectra, nor their rotationally induced photometric variability, believed to be due to the heterogeneous cloud coverage
Elena Manjavacas, Paulo A. Miles-Páez, Theodora Karalidi, Johanna M. Vos, Max L. Galloway, Julien H. Girard   +5 more
doaj   +1 more source

Identifying nearby field T dwarfs in the UKIDSS Galactic Clusters Survey [PDF]

, 2008
‘The definitive version is available at www3.interscience.wiley.com '. Copyright Royal Astronomical Society. DOI: 10.1111/j.1365-2966.2008.14384.xWe present the discovery of two new late-T dwarfs identified in the UKIRT Infrared Deep Sky Survey (UKIDSS ...
Allard, B. Burningham, Baraffe, Basri, Bihain, Bouy, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burningham, Caballero, Caballero, Casali, Casewell, Close, Cutri, D. J. Pinfield, Deacon, Dye, Geballe, Genzel, Golimowski, Hambly, Hawley, Hewett, Hodapp, Jameson, Jameson, Kendall, Kirkpatrick, Kirkpatrick, Lawrence, Leggett, Liu, Lodieu, Lodieu, Lodieu, Lodieu, Lodieu, Marley, Martín, Martín, N. C. Hambly, N. Lodieu, Nakajima, Pinfield, Pinsonneault, Rebolo, Reid, Robichon, Salpeter, Strauss, Tinney, Tokunaga, Tsuji, Tsvetanov, Vrba, Warren, Warren, Zapatero Osorio, Zapatero Osorio, Zapatero Osorio   +66 more
core   +2 more sources