Interstellar Extinction of Planetary Nebulae

1993 ◽  
pp. 177-177
Author(s):  
G. Stasinska ◽  
R. Tylenda ◽  
A. Acker ◽  
B. Stenholm
Keyword(s):  
Planetary Nebulae ◽  
Interstellar Extinction

scholarly journals Photometric Observations of the Central Stars of Planetary Nebulae

1968 ◽  
Vol 34 ◽  
pp. 320-323 ◽  
Author(s):  
William Liller ◽  
Cheng-Yuan Shao
Keyword(s):  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Photometric Observations ◽  
The Individual ◽  
Central Stars ◽  
Individual Objects

Currently at Harvard, we are engaged in a program for measuring multi-color magnitudes of the central stars of planetary nebulae. We plan to determine magnitudes of all favourable planetaries having central stars brighter than 16th photographic magnitude. The results, when completed, will give us improved information on (1) the amount of interstellar extinction for the individual objects, (2) the luminosities and colors of the central stars, (3) interstellar reddening corrections for spectrophotometric studies, and (4) the existence of variability among the central stars.

scholarly journals The Space Distribution of Planetary Nebulae

1968 ◽  
Vol 34 ◽  
pp. 44-50 ◽  
Author(s):  
J.H. Cahn
Keyword(s):  
Computer Program ◽  
White Dwarf ◽  
Local Density ◽  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Space Distribution ◽  
Using Data ◽  
Dust Distribution ◽  
Made In

A punched-card catalogue of planetary nebulae has been prepared, using data extracted from all existing catalogues. A computer program calculates distances and radii using the method of Shklovsky, in which all nebulae are assumed to have the same ionized mass, and allowance for interstellar extinction is made assuming a continuous galactic-dust distribution. The assumption made in Shklovsky's method, that the nebulae are optically thin, is considered to be satisfied if the calculated radii lie within a certain well-defined interval. The reddening constants obtained are in satisfactory statistical agreement with constants determined by other methods. The local density of planetary nebulae is in agreement with estimates of local white-dwarf densities.

scholarly journals Spectroscopic Distances to Central Stars of Planetary Nebulae

1989 ◽  
Vol 131 ◽  
pp. 168-168 ◽  
Author(s):  
R. H. Méndez ◽  
R. P. Kudritzki ◽  
A. Herrero ◽  
D. Husfeld ◽  
H. G. Groth
Keyword(s):  
Absorption Line ◽  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Model Atmosphere ◽  
Line Profiles ◽  
Available Information ◽  
Central Stars

We present spectroscopic distances for 22 central stars of planetary nebulae. These distances have been determined using information provided by our non-LTE model atmosphere analyses of the stellar H and He absorption line profiles. In this way, no assumptions about nebular properties are necessary.Our spectroscopic distances turn out to be larger than many other frequently cited values. We show that our distances are not in contradiction with the available information about the interstellar extinction, and we describe additional evidence supporting them.

scholarly journals Extinction - Distances to Planetary Nebulae

1983 ◽  
Vol 103 ◽  
pp. 540-540
Author(s):  
R. Gathier ◽  
S.R. Pottasch
Keyword(s):  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Line Of Sight

Individual distances to planetary nebulae (PN) which are independent of any assumption of average nebular characteristics, can be found if one knows the relation between interstellar extinction (E(B-V)) and distance along the line-of-sight to the PN, together with the E(B-V) towards the PN itself (Lutz, 1973 and Acker, 1978). We used VBLUW-photometry (Lub and Pel, 1977) to derive accurate E(B-V)'s and distances of stars up to V-magnitude + 14, within 0°.3 from the PN. Table 1 lists the PN we studied. The E(B-V)'s of the PN are derived from:

scholarly journals Planetary nebulae detected in the Spitzer Space Telescope GLIMPSE 3D Legacy Survey

2011 ◽  
Vol 7 (S283) ◽  
pp. 528-529
Author(s):  
Yong Zhang ◽  
Sun Kwok ◽  
Chih-Hao Hsia ◽  
Jun-ichi Nakashima ◽  
Nico Koning
Keyword(s):  
Galactic Plane ◽  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Optical Observations ◽  
Spitzer Space Telescope ◽  
Good Opportunity ◽  
Mid Infrared ◽  
Space Telescope

AbstractDue to interstellar extinction, optical census of Galactic planetary nebulae (PNs) is highly incomplete, and some compact H ii regions might have been mis-classified as PNs. The problem is particularly severe in the Galactic plane where the extinction in the optical is significant and hampers the detections of PNs. Unlike optical observations, infrared (IR) observations are hardly affected by interstellar extinction, and provide a good opportunity to study highly obscured PNs. In this study, we use the data from the Spitzer Legacy Infrared Mid-Plane Survey Extraordinaire 3D (GLIMPSE 3D) to investigate the mid-infrared (MIR) properties of PNs and PN candidates.

scholarly journals The Interstellar Extinction Towards the Milky Way Bulge with Planetary Nebulae, Red Clump, and RR Lyrae Stars

2016 ◽  
Vol 33 ◽  
Author(s):  
David M. Nataf
Keyword(s):  
Globular Clusters ◽  
Milky Way ◽  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Rr Lyrae ◽  
Spatial Coverage ◽  
Substantial Progress ◽  
The Difference ◽  
Red Clump ◽  
Improved Accuracy

AbstractI review the literature covering the issue of interstellar extinction towards the Milky Way bulge, with emphasis placed on findings from planetary nebulae, RR Lyrae, and red clump stars. I also report on observations from HI gas and globular clusters. I show that there has been substantial progress in this field in recent decades, most particularly from red clump stars. The spatial coverage of extinction maps has increased by a factor ~ 100 × in the past 20 yr, and the total-to-selective extinction ratios reported have shifted by ~ 20–25%, indicative of the improved accuracy and separately, of a steeper-than-standard extinction curve. Problems remain in modelling differential extinction, explaining anomalies involving the planetary nebulae, and understanding the difference between bulge extinction coefficients and ‘standard’ literature values.

scholarly journals Interstellar Extinction of Planetary Nebulae

1993 ◽  
Vol 155 ◽  
pp. 177-177 ◽  
Author(s):  
G. Stasinska ◽  
R. Tylenda ◽  
A. Acker ◽  
B. Stenholm
Keyword(s):  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Balmer Decrement

We have compared the extinction of planetary nebulae (PN) as derived from the Balmer decrement and from the ratio of radio to Hβ fluxes.

scholarly journals Observations of Planetary Nebulae at Radio Wavelengths

1968 ◽  
Vol 34 ◽  
pp. 87-103 ◽  
Author(s):  
Yervant Terzian
Keyword(s):  
Radio Emission ◽  
Radio Frequency ◽  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Radio Sources ◽  
Radio Telescopes ◽  
Radio Observations

Planetary nebulae are weak radio sources. The radio emission of planetary nebulae is primarily due to free-free transitions in the ionized hydrogen cloud. Very large radio telescopes and sensitive receivers are needed to detect the weak radio emission of planetary nebulae. During the last 3 years about 80 planetary nebulae have been detected at some one radio frequency, and more than 60% of these have been detected at more than one frequency. Most of the measurements have been made to measure the flux densities of the nebulae and determine their radio spectra. A few interferometric observations have also been made to determine the radio widths of planetary nebulae. In some cases the radio observations have been used to determine the electron temperatures and emission measures of planetary nebulae, and also to derive the interstellar extinction at Hβ.

scholarly journals ATCA radio observations of compact planetary nabulae

2011 ◽  
Vol 7 (S283) ◽  
pp. 380-381
Author(s):  
Marcin Hajduk ◽  
Albert A. Zijlstra
Keyword(s):  
Planetary Nebulae ◽  
Interstellar Extinction ◽  
Radio Continuum ◽  
Galactic Bulge ◽  
Radio Observations ◽  
Compact Array

AbstractWe present new observations in the radio continuum of 31 planetary nebulae at 5 and 8 GHz with the Australian Telescope Compact Array. The observations are used to invesigate properties of the interstellar extinction toward Galactic Bulge.

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