Results 31 to 40 of about 83,683 (249)

Architecture of dwarf shrubs and dwarf subshrubs of the genus of Thymus L. and Scutellaria L. (Lamiaceae) [PDF]

BIO Web of Conferences, 2021
The structure of 24 species of Thymus and 12 species of Scutellaria was studied using the architectural approach. For the first time, an architectural unit was described, it is a branched sympodial axis. The architectural unit consists of sympodial axes n+1 order, formation shoots, branching shoots, ephemerous shoots.
Cheryomushkina Vera, Talovskaya Evgeniya, Guseva Alexandra   +2 more
openaire   +2 more sources

ULAS J141623.94+134836.3: A BLUE T DWARF COMPANION TO A BLUE L DWARF [PDF]

The Astronomical Journal, 2010
We confirm the substellar nature of ULAS J141623.94+134836.3, a common proper motion companion to the blue L dwarf SDSS J141624.08+134826.7 identified by Burningham et al. and Scholz. Low-resolution 0.8-2.4 micron spectroscopy obtained with IRTF/SpeX shows strong H2O and CH4 absorption bands, consistent with a T7.5 spectral type, and we see possible ...
Burgasser, Adam J., Looper, Dagny L., Rayner, John T.   +2 more
openaire   +4 more sources

Devouring the Milky Way Satellites: Modeling Dwarf Galaxies with Galacticus

The Astrophysical Journal, 2023
Dwarf galaxies are ubiquitous throughout the universe and are extremely sensitive to various forms of internal and external feedback. Over the last two decades, the census of dwarf galaxies in the Local Group and beyond has increased markedly.
Sachi Weerasooriya, Mia Sauda Bovill, Andrew Benson, Alexi M. Musick, Massimo Ricotti   +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

THE ORBIT OF THE L DWARF + T DWARF SPECTRAL BINARY SDSS J080531.84+481233.0* [PDF]

The Astrophysical Journal, 2016
ABSTRACT SDSS J080531.84+481233.0 is a closely separated, very-low-mass (VLM) binary identified through combined-light spectroscopy and confirmed as an astrometric variable. Here we report four years of radial velocity monitoring observations of the system that reveal significant and periodic variability, confirming the binary nature of ...
Adam J. Burgasser, Cullen H. Blake, Christopher R. Gelino, Johannes Sahlmann, Daniella Bardalez Gagliuffi   +4 more
openaire   +3 more sources

Spitzer Variability Properties of Low-gravity L Dwarfs [PDF]

The Astronomical Journal, 2020
Abstract We present Spitzer Space Telescope variability monitoring observations of three low-gravity L dwarfs with previous detections of variability in the near-IR: 2MASS J0045+16, 2MASS J0501−00, and 2MASS J1425−36. We detect significant periodic variability in two of our targets, 2MASS J0045+16 and 2MASS J0501−00.
Johanna M. Vos, Beth A. Biller, Katelyn N. Allers, Jacqueline K. Faherty, Michael C. Liu, Stanimir Metchev, Simon Eriksson, Elena Manjavacas, Trent J. Dupuy, Markus Janson, Jacqueline Radigan-Hoffman, Ian Crossfield, Mickaël Bonnefoy, William M. J. Best, Derek Homeier, Joshua E. Schlieder, Wolfgang Brandner, Thomas Henning, Mariangela Bonavita, Esther Buenzli   +19 more
openaire   +4 more sources

RESOLVED SPECTROSCOPY OF M DWARF/L DWARF BINARIES. III. THE “WIDE” L3.5/L4 DWARF BINARY 2MASS J15500845+1455180AB [PDF]

The Astronomical Journal, 2009
8 pages, 4 figures, accepted for publication to ...
Burgasser, Adam J., Dhital, Saurav, West, A. A.   +2 more
openaire   +4 more sources

Weather on Other Worlds. II. Survey Results: Spots Are Ubiquitous on L and T Dwarfs

, 2014
We present results from the "Weather on Other Worlds" Spitzer Exploration Science program to investigate photometric variability in L and T dwarfs, usually attributed to patchy clouds.
Apai, Dániel, Artigau, Étienne, Burgasser, Adam, Flateau, Davin, Goldman, Bertrand, Heinze, Aren, Marley, Mark S., Metchev, Stanimir, Plavchan, Peter, Radigan, Jacqueline   +9 more
core   +1 more source

SDSS J080531.84+481233.0: An Unresolved L Dwarf/T Dwarf Binary [PDF]

The Astronomical Journal, 2007
SDSS J080531.84+481233.0 is a peculiar L-type dwarf that exhibits unusually blue near-infrared and mid-infrared colors and divergent optical (L4) and near-infrared (L9.5) spectral classifications. These peculiar spectral traits have been variously attributed to condensate cloud effects or subsolar metallicity.
openaire   +2 more sources

IZphotometry of L dwarfs and the implications for brown dwarf surveys [PDF]

Monthly Notices of the Royal Astronomical Society, 2000
The I-Z colour has been recently shown to be a good temperature indicator for M dwarfs. We present the first IZ photometry of a small sample of L dwarfs ranging in spectral type from L0.5V to L6.0V. We find that the I-Z colour is not a good temperature indicator for objects between L1V and L5V, such objects having colours that overlap with mid M dwarfs.
Steele, I. A., Howells, L.
openaire   +2 more sources