Results 1 to 10 of about 335 (184)
Quantitative classification of WR nuclei of planetary nebulae [PDF]
Astronomy and Astrophysics, 2003 We analyse 42 emission-line nuclei of Planetary Nebulae (PNe), in the framework of a large spectrophotometric survey of (WC) nuclei of PNe conducted since 1994, using low/medium resolution spectra obtained at ESO and at OHP. We construct a grid of selected line-intensities (normalized to C iv-5806 A= 100) ordered by decreasing ionisation potential ...
A Acker, C Neiner
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Two Interesting Nuclei of Planetary Nebulae: IC 418 and NGC 40 [PDF]
Proceedings of the National Academy of Sciences of the United States of America, 1941 Swings P, Struve O
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Catalogue of Planetary Nebulae and their Nuclei [PDF]
Astrophysics and Space Science Library, 1982 Since the catalogue by Perek and Kohoutek (PK) has been printed in 1967, numerous observations and theoretical studies have been made, and new planetary nebulae (NP) have been discovered, in addition to the 1036 PN indexed by PK. We have compiled a bibliographic index from 1965, covering about 80 papers per year; a catalogue of 1455 PN and a ...
A Acker, Acker A
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Nuclei of Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1974 The nuclei of planetary nebulae are examined both observationally and theoretically. It is seen that the region occupied by these stars in the log T— logL diagram is quite wide but consistent with a general progression of stars from high to low luminosity, with a noticeable but not large increase in luminosity during the early phase.
C. R. O’Dell
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Hydrostatic evolutionary sequences for the nuclei of planetary nebulae
Astrophysical Journal, 1986 Etude des proprietes des noyaux en fonction des trois parametres suivants: la masse du noyau, choisie egale a 0,60-0,70-0,76-0,89 MO; la phase de separation d'avec la branche asymptotique des geantes, choisie en quatre points egalement separes a l'interieur du cycle des flashes de l'helium; et la perte de masse qui prend toute une serie de ...
P. R. Wood, D. J. Faulkner
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The Early Evolution of the Nuclei of Planetary Nebulae [PDF]
Monthly Notices of the Royal Astronomical Society, 1969 B L Webster
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When the Stars Align: A 5σ Concordance of Planetary Nebulae Major Axes in the Center of Our Galaxy
The Astrophysical Journal Letters, 2023 We report observations of a remarkable major axes alignment nearly parallel to the Galactic plane of 5 σ significance for a subset of bulge “planetary nebulae” (PNe) that host, or are inferred to host, short-period binaries. Nearly all are bipolar. It is
Shuyu Tan +4 more
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Catalog of Planetary Nebulae Detected by GALEX and Corollary Optical Surveys
The Astrophysical Journal Supplement Series, 2023 Planetary nebulae (PNs) consist of an ionized envelope surrounding a hot central star (CSPN) that emits mostly at ultraviolet (UV) wavelengths. UV observations, therefore, provide important information on both the CSPN and the nebula. We have matched the
M. A. Gómez-Muñoz +2 more
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The Astrophysical Journal, 2023 We present the final results of an imaging and spectroscopic search for stars in the Large Magellanic Cloud (LMC) with C ii λλ 7231, 7236 emission lines. The goal is to identify and study [WC11] stars, the coolest of the low-mass Wolf–Rayet sequence, and
Bruce Margon +4 more
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The Binary and the Disk: The Beauty is Found within NGC3132 with JWST
The Astrophysical Journal, 2023 The planetary nebula (PN) NGC 3132 is a striking example of the dramatic but poorly understood mass-loss phenomena that (1–8) M _⊙ stars undergo during their death throes as they evolve into white dwarfs (WDs). From an analysis of JWST multiwavelength (0.
Raghvendra Sahai +6 more
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