scholarly journals A New Technique for Characterising Planetary Nebulae in External Galaxies

1995 ◽  
Vol 149 ◽  
pp. 33-37
Author(s):  
K. Taylor ◽  
N.G. Douglas
Keyword(s):  
Velocity Field ◽  
Mass Distribution ◽  
Planetary Nebulae ◽  
Radial Velocities ◽  
New Technique ◽  
External Galaxy ◽  
External Galaxies ◽  
One Step ◽  
A New Technique ◽  
Distance Indicators

AbstractPlanetary Nebulae are proving to be powerful tertiary distance indicators as well as sensitive probes of a galaxy’s velocity field and mass distribution. We present a new technique for determining the positions, luminosities and radial velocities of the PNe in an external galaxy which may enable a one-step measurement of all these parameters.

One-Step Endosonography-Guided Drainage of a Pancreatic Pseudocyst: A New Technique of Stent Delivery Through the Echo Endoscope

Endoscopy ◽  
1998 ◽  
Vol 30 (08) ◽  
pp. 730-733 ◽  
Author(s):  
P. Vilmann ◽  
S. Hancke ◽  
T. Pless ◽  
J. D. Schell-Hincke ◽  
F. W. Henriksen
Keyword(s):  
Pancreatic Pseudocyst ◽  
New Technique ◽  
One Step ◽  
A New Technique

Coravel Radial Velocities of Supergiants in the Small Magellanic Cloud

1984 ◽  
Vol 88 ◽  
pp. 265-268
Author(s):  
E. Maurice ◽  
N. Martin ◽  
L. Prévot ◽  
E. Rebeirot
Keyword(s):  
South Africa ◽  
Velocity Field ◽  
Planetary Nebulae ◽  
Hii Regions ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Radial Velocities ◽  
Small Magellanic Cloud ◽  
Objective Prism

Kinematical studies of the Magellanic Clouds began more than half a century ago, when Wilson, in 1918, first interpreted the gradient of the 17 radial velocities of gazeous nebulae in the Large Cloud in terms of rotation. In the case of the Small Magellanic Cloud, the first real attempt to understand the velocity field of this galaxy was performed by the Radcliffe astronomers (Feast et al., 1960, 1961). Their study was based on radial velocities of 40 stars and 13 HII regions.With the installation by ESO of an objective-prisme astrograph in South Africa, in 1961, and then of several larger telescopes in Chile in 1968, the number of measurements significantly increased for Magellanic objects, in particular in the SMC. In this galaxy, the objective-prism observations resulted in about 100 stellar radial velocities (Florsch, 1972a) of probable members. A compilation by Maurice (1979) of all then known slit-spectrograph radial velocities gave velocities for 80 supergiants, 35 HII regions and 12 planetary nebulae.

scholarly journals A highly sensitive one-step method for silver intensification of the nickel-diaminobenzidine endproduct of peroxidase reaction.

1989 ◽  
Vol 37 (10) ◽  
pp. 1563-1565 ◽  
Author(s):  
I Merchenthaler ◽  
J Stankovics ◽  
F Gallyas
Keyword(s):  
Physical Development ◽  
New Technique ◽  
Step Method ◽  
Substrate Solution ◽  
Peroxidase Reaction ◽  
Additional Step ◽  
Highly Sensitive ◽  
One Step ◽  
A New Technique ◽  
Physical Developer

We have developed a new technique which makes silver intensification of the oxidatively polymerized diaminobenzidine (DAB), the endproduct of peroxidase reaction, less laborious without any loss in selectivity or sensitivity. The new technique is based on two strategies: (a) increasing the argyrophilia of the DAB by modifying its polymerization with Ni ions, and (b) decreasing tissue argyrophila by using a mildly acidic physical developer instead of the alkaline one previously presented. Because the nickel modification takes place in the DAB substrate solution, i.e., in the final step of the peroxidase reaction, only one additional step, the physical development, must be carried out if intensification is needed.

scholarly journals A dedicated camera for extragalactic Planetary Nebulae: The Planetary Nebula Spectrograph

1997 ◽  
Vol 180 ◽  
pp. 493-494 ◽  
Author(s):  
N.G. Douglas ◽  
K. Taylor ◽  
K. C. Freeman ◽  
T. S. Axelrod
Keyword(s):  
Planetary Nebula ◽  
Planetary Nebulae ◽  
Dynamical Behaviour ◽  
Virgo Cluster ◽  
Radial Velocities ◽  
External Galaxies

Photometry in [OIII] emission of Planetary Nebulae in external galaxies can be used to determine distances as great as that of the Virgo cluster and beyond, as forcefully argued elsewhere during this conference (G.H. Jacoby, invited talk). In addition, measurement of the radial velocities of the PN allows dynamical behaviour to be probed to much greater distance from the galaxian centre than integrated light techniques (e.g. Arnaboldi 1994).

scholarly journals KELT-8b: A HIGHLY INFLATED TRANSITING HOT JUPITER AND A NEW TECHNIQUE FOR EXTRACTING HIGH-PRECISION RADIAL VELOCITIES FROM NOISY SPECTRA

2015 ◽  
Vol 810 (1) ◽  
pp. 30 ◽  
Author(s):  
Benjamin J. Fulton ◽  
Karen A. Collins ◽  
B. Scott Gaudi ◽  
Keivan G. Stassun ◽  
Joshua Pepper ◽  
...  
Keyword(s):  
High Precision ◽  
Radial Velocities ◽  
New Technique ◽  
A New Technique ◽  
Hot Jupiter

scholarly journals Cepheids in Magellanic Cloud Clusters

1993 ◽  
Vol 139 ◽  
pp. 359-367
Author(s):  
D.L. Welch ◽  
M. Mateo ◽  
E.W. Olszewski
Keyword(s):  
High Precision ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Radial Velocities ◽  
Current Work ◽  
New Technique ◽  
Cloud Clusters ◽  
Cepheid Variables ◽  
A New Technique ◽  
Selection Of

AbstractThe Magellanic Clouds remain an ideal place to study the properties of Cepheid variables. In this paper, we review historical and current work on Cepheids in LMC and SMC clusters, present new results for NGC 1866 and NGC 2164, and describe a new technique for automated selection of Cepheid variables using two-color photometry. We also emphasize the numerous advantages of high-precision radial velocities in the study of Magellanic Cloud variables.

scholarly journals A New Technique for Preserving Conservation Laws

2021 ◽  
Author(s):  
Gianluca Frasca-Caccia ◽  
Peter E. Hydon
Keyword(s):  
Conservation Laws ◽  
Spatial Dimension ◽  
New Technique ◽  
Local Conservation ◽  
Fully Discrete ◽  
Time Integrators ◽  
Petviashvili Equation ◽  
New Strategy ◽  
One Step ◽  
A New Technique

AbstractThis paper introduces a new symbolic-numeric strategy for finding semidiscretizations of a given PDE that preserve multiple local conservation laws. We prove that for one spatial dimension, various one-step time integrators from the literature preserve fully discrete local conservation laws whose densities are either quadratic or a Hamiltonian. The approach generalizes to time integrators with more steps and conservation laws of other kinds; higher-dimensional PDEs can be treated by iterating the new strategy. We use the Boussinesq equation as a benchmark and introduce new families of schemes of order two and four that preserve three conservation laws. We show that the new technique is practicable for PDEs with three dependent variables, introducing as an example new families of second-order schemes for the potential Kadomtsev–Petviashvili equation.

Sign in / Sign up

Export Citation Format

Share Document