scholarly journals Low Resolution Spectroscopy of 13 Low Surface Brightness PN's

1989 ◽  
Vol 131 ◽  
pp. 220-220
Author(s):  
A. Manchado ◽  
S. R. Pottasch ◽  
A. Mampaso
Keyword(s):  
Surface Brightness ◽  
Photon Counting ◽  
Outer Part ◽  
Low Resolution ◽  
Counting System ◽  
Isaac Newton ◽  
La Palma ◽  
Ionization Structure ◽  
Low Surface Brightness ◽  
Isaac Newton Telescope

We have obtained long-slit low resolution spectra (7.5 A resolution) of a sample of 13 low surface brightness planetary nebulae using the 2.5-m Isaac Newton Telescope (La Palma) with the Image Photon Counting System (IPCS) covering a spectral range from 3300 A to 7300 A. From those spectra we calculated the ionic and total abundances of 0, N, Ne and Ar. Variations in the ionization structure between the inner and the outer part are found in some nebulae although the total abundances appear not to change significantly along the nebulae.

scholarly journals The Halos of NGC 6543 and NGC 6826

1989 ◽  
Vol 131 ◽  
pp. 196-196
Author(s):  
A. Manchado ◽  
S. R. Pottasch ◽  
A. Mampaso
Keyword(s):  
Photon Counting ◽  
Central Zone ◽  
Planetary Nebulae ◽  
Low Resolution ◽  
Electronic Temperature ◽  
Counting System ◽  
Isaac Newton ◽  
Physical Conditions ◽  
La Palma ◽  
Isaac Newton Telescope

Long slit low resolution (3.4 A) spectra of the planetary nebulae NGC 6543 and NGC 6826, obtained using the 2.5-m Isaac Newton Telescope (La Palma) with the Image Photon Counting System (IPCS), indicate different physical conditions in the outer halos than in the central zone, with an outward increase of electronic temperature. The estimated mass contained in these halos is considerably larger than the values of the inner nebulae.

scholarly journals Detailed studies of IPHAS sources - III. The highly extinguished bipolar planetary nebula IPHASX J191104.8+060845

2020 ◽  
Author(s):  
J B Rodríguez-González ◽  
L Sabin ◽  
J A Toalá ◽  
S Zavala ◽  
G Ramos-Larios ◽  
...  
Keyword(s):  
Planetary Nebula ◽  
Surface Brightness ◽  
Galactic Plane ◽  
Optical Telescope ◽  
Isaac Newton ◽  
Near Ir ◽  
Low Surface Brightness ◽  
Isaac Newton Telescope ◽  
Dark Lane ◽  
Main Cavity

Abstract We present the first detailed study of the bipolar planetary nebula (PN) IPHASX J191104.8+060845 (PN G 040.6−01.5) discovered as part of the Isaac Newton Telescope Photometric Hα Survey of the Northern Galactic plane (IPHAS). We present Nordic Optical Telescope (NOT) narrow-band images to unveil its true morphology. This PN consists of a main cavity with two newly uncovered extended low-surface brightness lobes located towards the NW and SE directions. Using near-IR WISE images we unveiled the presence of a barrel like structure, which surrounds the main cavity, which would explain the dark lane towards the equatorial regions. We also use Gran Telescopio de Canarias (GTC) spectra to study the physical properties of this PN. We emphasise the potential of old PNe detected in IPHAS to study the final stages of the evolution of the circumstellar medium around solar-like stars.

scholarly journals Ultraviolet to Near Infrared Observations of BF Cyg

1988 ◽  
Vol 103 ◽  
pp. 301-302
Author(s):  
A. Cassatella ◽  
R. Gonzalez-Riestra ◽  
T. Fernandez-Castro ◽  
J. Fuensalida ◽  
A. Gimenez
Keyword(s):  
Canary Islands ◽  
Near Infrared ◽  
Single Channel ◽  
Photon Counting ◽  
Optical Observations ◽  
Counting System ◽  
Infrared Observations ◽  
Isaac Newton ◽  
Preliminary Results ◽  
La Palma

In this paper we provide preliminary results of multifrequency observations of BF Cyg carried out in July 1986. The ultraviolet spectra were obtained on July 26, 1986 using the IUE satellite. The optical observations were made at the Observatorio del Roque de los Muchachos (La Palma, Canary Islands) in July 1986 during the night 13/14 using the Isaac Newton 2.5m telescope with the Intermediate Dispersion Spectrograph (IDS, 500 mm camera) and the Image Photon Counting System (IPCS). The infrared observations were made during the night 13/14 of July, 1986, at the Observatorio del Teide (Tenerife, Canary Islands) using the Carlos Sanchez 1.5m telescope and an infrared single-channel photometer with an InSb detector.

scholarly journals The La Palma Data Archive

1989 ◽  
Vol 110 ◽  
pp. 139-140
Author(s):  
Chris Benn
Keyword(s):  
Data Archive ◽  
Isaac Newton ◽  
La Palma ◽  
Data Archives ◽  
International Ultraviolet Explorer ◽  
Isaac Newton Telescope ◽  
The Republic ◽  
Volcanic Caldera ◽  
The Uk ◽  
William Herschel

The Observatorio del Roque de los Muchachos is perched atop a volcanic caldera on the island of La Palma in the Canary Islands, 400 km off the coast of North Africa. Three of the telescopes at the observatory are products of a collaboration between the UK, the Netherlands, Spain and the Republic of Ireland. They are the 1.0-m Jacobus Kapteyn Telescope, the 2.5-m Isaac Newton Telescope and the 4.2-m William Herschel Telescope (which saw first light in July 1987)1. The telescopes are computer controlled (running under ADAM software), and the observations are recorded primarily in electronic form. Recognising the success of astronomical-satellite data archives, such as that generated by the International Ultraviolet Explorer, a La Palma Data Archive has been established at the Royal Greenwich Observatory. The archive will be used by astronomers wishing to exploit data obtained by other observers, by engineers interested in the performance of telescope and instruments under varying conditions, and for monitoring the way in which the telescope is used.

scholarly journals Co-ordinated Optical and Radio Observations of Symbiotic Stars

1990 ◽  
Vol 122 ◽  
pp. 442-443
Author(s):  
R. J. Ivison ◽  
M. F. Bode ◽  
J. Meaburn ◽  
R. J. Davis ◽  
R. F. Nelson ◽  
...  
Keyword(s):  
Broad Band ◽  
Symbiotic Stars ◽  
Echelle Spectrograph ◽  
Type Region ◽  
Isaac Newton ◽  
La Palma ◽  
Circumstellar Extinction ◽  
Optical Line ◽  
Isaac Newton Telescope ◽  
5 Ghz

AbstractWe present preliminary results from absolutely flux-calibrated optical spectroscopy, together with 5 GHz radio flux measures of 17 symbiotic stars. The data were obtained quasi-simultaneously using the Manchester Echelle Spectrograph on the Isaac Newton Telescope, La Palma between 1988 September 20 and 24, and the Broad Band Interferometer at Jodrell Bank during 1988 October. This represents the largest sample of these stars observed in this way to date. Distances are calculated using visual extinctions and are compared with other quoted values. In general, the agreement is surprisingly good. Plots of individual line luminosities vs. radio luminosity indicate that the D-type (dusty) symbiotics (both also proto-planetary nebulae) have far higher radio luminosities than S-types (stellar) for comparable recombination and forbidden line luminosities. This may however be due to underestimation of optical line luminosities for the D-types as the circumstellar extinction contribution is uncertain. The single D’-type (cool dust, yellow secondary) lies at the low luminosity end of the S-type region. ‘Very slow novae’ in our sample lie in both groups.

scholarly journals Multiband Photometry of NGC 7479 and NGC 7606

1996 ◽  
Vol 157 ◽  
pp. 123-125
Author(s):  
A. M. Varela ◽  
J. A. L. Aguerri ◽  
M. Prieto ◽  
C. Muñoz-Tuñón
Keyword(s):  
Spiral Galaxies ◽  
Three Dimensional ◽  
Surface Photometry ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Isaac Newton ◽  
La Palma ◽  
Radial Profiles ◽  
Isaac Newton Telescope ◽  
Barred Spiral Galaxies

We present surface photometry in U BV RI passbands of the barred spiral galaxies NGC 7479 and NGC 7606, for which observations were obtained at the Cassegrain focus of the 2.5-m Isaac Newton Telescope at La Palma. Data are presented in the form of images and mean radial profiles from azimuthal fits of ellipses, giving the luminosity, ellipticities and position angles of the isophotes as functions of the galactocentric radii. Images in I-band are shown in Figure 1 of NGC 7479 (left) and NGC 7606 (right). These belong to a sample of galaxies with moderate circumnuclear starbursts. We are analyzing their structure to study the effects of departures from an axisymmetric potential for the dynamics of a galaxy. One objective of this study is to make a three-dimensional model of the bar and bulge using the method of photometric inversion. The sample consists of 27 spiral galaxies with and without a bar.

Low Resolution Spectroscopy of 13 Low Surface Brightness PN’s

1989 ◽  
pp. 220-220
Author(s):  
A. Manchado ◽  
S. R. Pottasch ◽  
A. Mampaso
Keyword(s):  
Surface Brightness ◽  
Low Resolution ◽  
Low Surface Brightness

scholarly journals Shock Modelling of the Bipolar Outflow Source NGC 6537

1993 ◽  
Vol 155 ◽  
pp. 385-385
Author(s):  
L. Cuesta ◽  
J. P. Phillips
Keyword(s):  
High Resolution ◽  
Narrow Band ◽  
Type I ◽  
High Excitation ◽  
Optical Telescope ◽  
Isaac Newton ◽  
Bipolar Outflow ◽  
La Palma ◽  
Large Shell ◽  
Isaac Newton Telescope

NGC 6537 is an unusual high excitation bipolar outflow source, with anomalous abundances indicative of a type I nebula. We have recently obtained a range of high resolution spectrophotometry for this source using the 2.5 m Isaac Newton Telescope (Observatorio del Roque de Los Muchachos, La Palma), together with narrow band optical imaging using the 2.6 m Nordic Optical Telescope (Observatorio del Roque de los Muchachos, La Palma). As a consequence, it is apparent that the source optical morphology is suggestive of the presence of an hyperbolic shock outflow surface, similar to those observed in other BPN (e.g. NGC 6302, Hb 5). Line ratio maps also indicate the presence of extremely strong [Nii] emission at the periphery of the outflow, whilst expansion velocities are of order ∼ 400 km sec−1. These large shell expansion velocities may in turn be driven by an extremely high velocity wind, which in this case appears to extend over a range ΔV ≥ 3000 km sec−1.

scholarly journals Visual Extinction and Physical Conditions in the Bipolar Nebula M2-9

1993 ◽  
Vol 155 ◽  
pp. 345-345
Author(s):  
A. Riera
Keyword(s):  
Detailed Analysis ◽  
Spectral Range ◽  
Spectral Resolution ◽  
Optical Spectra ◽  
Isaac Newton ◽  
Physical Conditions ◽  
La Palma ◽  
Visual Extinction ◽  
Isaac Newton Telescope

A detailed analysis of the visual extinction and physical conditions of the extreme bipolar nebula M2-9 has been made from optical spectra acquired with the Intermediate Dispersion Spectrograph of the 2.5m Isaac Newton Telescope (Observatorio del Roque de los Muchachos, La Palma) in combination with a 235mm camera and the IPCS detector covering the spectral range 3500-7500 Å with spectral resolution of 4 Å.

scholarly journals Galaxy Number-Counts to B = 28M

1994 ◽  
Vol 161 ◽  
pp. 645-648
Author(s):  
N. Metcalfe ◽  
T. Shanks ◽  
N. Roche ◽  
R. Fong
Keyword(s):  
Power Law Distribution ◽  
Isaac Newton ◽  
La Palma ◽  
The Galaxy ◽  
History Of ◽  
Isaac Newton Telescope ◽  
William Herschel ◽  
Ccd Detectors ◽  
Number Counts ◽  
Evolving Models

Counting the number of galaxies as a function of their apparent brightness is one of the fundamental cosmological tests, providing an important probe of both the geometry and evolutionary history of the Universe. CCD detectors have in recent years enabled astronomers to explore magnitude limits undreamed of a decade or so ago, and where important constraints can be placed on the allowable combinations of q 0 and evolution. Recent work has shown that the B-band counts keep rising with a power-law distribution, with a fivefold excess in the number of galaxies at B = 26.5 over that expected from simple non-evolving models. Indeed, it has been suggested that the total numbers of galaxies already seen may be too high for a q 0 = 0.5 universe, assuming there is a redshift cut-off in the galaxy distribution caused either by galaxies having strong Lyman limit systems or a low redshift of formation. As q 0 = 0.5 is favoured by theoretical arguments, it is important to see if the behaviour of the counts at even fainter magnitudes can be reconciled with a high density universe. Most published counts are unreliable faintward of B ≈ 26, as the incompleteness corrections required become comparable in size to the data. We have now extended the counts to B ∼ 28, using a ∼ 24 hour CCD exposure taken on the 2.5 m Isaac Newton telescope (INT) on La Palma, together with a ∼ 10 hour exposure on a small part of this field taken using the 4.2 m William Herschel Telescope (WHT).

Sign in / Sign up

Export Citation Format

Share Document