Zobrazeno 1 - 10
of 96
pro vyhledávání: '"S.R. Pottasch"'
Autor:
S.R. Pottasch
Publikováno v:
Symposium - International Astronomical Union. 155:449-460
The attempts in the literature to find a relation between planetary nebula core mass and the nebular abundance ratios N/O and He/H are described. A critical discussion concludes that the evidence for such a relation is weak.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0bbbf4137c87e269eb0a957f04783565
https://doi.org/10.1017/s0074180900172055
https://doi.org/10.1017/s0074180900172055
Publikováno v:
Astronomy & astrophysics, 531:A23. EDP Sciences
The aim of the paper is to determine abundances in a group of PNe with uniform morphology. The PNe discussed are circular excited by rather low-temperature central stars. The relation between abundance and evolution is discussed. The mid-infrared spe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d521267ce8e38df71f5274c1c370f6e1
https://doi.org/10.1051/0004-6361/201116669
https://doi.org/10.1051/0004-6361/201116669
Publikováno v:
International Astronomical Union Colloquium. 122:55-56
During a spectroscopic survey of IRAS sources with infrared colours similar to those in planetary nebulae, IRAS 06518-1041 revealed itself as a possible nova-like object. The spectrum of IRAS 06518 – 1041, which is shown in Figure 1, presents stron
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c55c3af72f552e9950c48ed9d2f330c8
https://doi.org/10.1017/s0252921100068330
https://doi.org/10.1017/s0252921100068330
Publikováno v:
Symposium - International Astronomical Union. 155:331-331
We present a study of the distribution of post-AGB stars and planetary nebulae (PNe) in the IRAS two-colour diagram. From the analysis of the distribution of spectral types of post-AGB stars in this diagram we conclude that the position at which a st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dad9ba6a62b216bb9038cf88364f1252
https://doi.org/10.1017/s0074180900171207
https://doi.org/10.1017/s0074180900171207
Publikováno v:
Symposium - International Astronomical Union. 155:378-378
TAURUS, the imaging Fabry-Perot spectrometer, using a CCD detector, has been commissioned on the 4.2m William Herschel Telescope, creating a powerful tool for studying the kinematics of emission line objects such as planetary nebulae. The mode of ope
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e4833ede71901b19eab9429906aeb28
https://doi.org/10.1017/s0074180900171670
https://doi.org/10.1017/s0074180900171670
Publikováno v:
Symposium - International Astronomical Union. 155:398-398
PC 11 (HD 149427, PK 331-5 1) is classified as a young planetary nebula with strong OIII 4363Å and a Zanstra temperature of TZ = 27000K. It is also classified as (D′ — type) yellow symbiotic star with A — F type companion. It is an IRAS source
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1893ee5c0655a2125b96f49f9169c799
https://doi.org/10.1017/s0074180900171876
https://doi.org/10.1017/s0074180900171876
Publikováno v:
Symposium - International Astronomical Union. 155:348-348
IRAS 17423-1755 is a new transition object between the post-AGB phase and the planetary nebula (PN) stage included in an observational program of IRAS sources with infrared colours similar to those of PNe. We have taken B, V, R, I, Z, Hα and [OIII]
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7d76109e36ceb91b7875db3094ed8b1
https://doi.org/10.1017/s0074180900171372
https://doi.org/10.1017/s0074180900171372
Publikováno v:
Symposium - International Astronomical Union. 155:357-357
During a time interval of only 2 years, a sudden change has been detected in the emission line spectrum of a young planetary nebula IRAS 0656 2-0337, whose nature has been recently discussed by several authors, was firstly observed in December 1987 a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ccf96d87d94f031248c8e87a3663f16b
https://doi.org/10.1017/s0074180900171463
https://doi.org/10.1017/s0074180900171463
Publikováno v:
Symposium - International Astronomical Union. 155:394-394
UU Sge, the eclipsing binary central star (Bond et al, 1978) of the low-surface-brightness planetary nebula (PN) Abell 63, has been observed spectroscopically in the visible throughout its 11.2 hour period and especially during the minimum. A spectra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e25d49d0f9997d285a516bae6f15730
https://doi.org/10.1017/s0074180900171839
https://doi.org/10.1017/s0074180900171839
Autor:
G.C. Van De Steene, S.R. Pottasch
Publikováno v:
Symposium - International Astronomical Union. 155:40-40
In an attempt to find new Planetary Nebulae we have short radio continuum observations at 6 cm and 3 cm of 90 PN candidates with the Australian Compact Array. We selected the unidentified objects from the IRAS Point Source Catalogue on basis of their
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::439866ede47862648d39231b6cecfbd9
https://doi.org/10.1017/s0074180900170020
https://doi.org/10.1017/s0074180900170020