Results 31 to 40 of about 87,580 (344)

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

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

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

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

A JWST Survey for Planetary Mass Brown Dwarfs in IC 348

The Astronomical Journal, 2023
We have obtained images of the center of the star-forming cluster IC 348 with the James Webb Space Telescope and have identified brown dwarf candidates based on their photometry and point-like flux profiles. Low-resolution spectroscopy has been performed
K. L. Luhman, C. Alves de Oliveira, I. Baraffe, G. Chabrier, T. R. Geballe, R. J. Parker, Y. J. Pendleton, P. Tremblin   +7 more
doaj   +1 more source

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

Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition [PDF]

, 2006
We present the results of a Hubble Space Telescope NICMOS imaging survey of 22 T-type field brown dwarfs. Five are resolved as binary systems with angular separations of 0"05-0"35, and companionship is established on the basis of component F110W-F170M ...
Adam Burrows, Adam J. Burgasser, Burgasser A. J., Delfosse X., Duquennoy A., I. Neill Reid, J. Davy Kirkpatrick, James Liebert, Kelle L. Cruz, Maxted P. F. L., Michael E. Brown, Potter D., Sandy K. Leggett, Tsuji T.   +13 more
core   +4 more sources

NICMOS Kernel-phase Interferometry. II. Demographics of Nearby Brown Dwarfs

The Astronomical Journal, 2023
Star formation theories have struggled to reproduce binary brown dwarf population demographics (e.g., frequency, separation, and mass ratio). Kernel-phase interferometry is sensitive to companions at separations inaccessible to classical imaging ...
Samuel M. Factor, Adam L. Kraus
doaj   +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