Results 51 to 60 of about 6,433 (179)

Periodic Variability of the Central Stars of Planetary Nebulae Surveyed through the Zwicky Transient Facility

The Astrophysical Journal
A consensus has been reached in recent years that binarity plays an important role in the formation and evolution of a significant fraction of planetary nebulae (PNe).
Pinjian Chen, Xuan Fang, Xiaodian Chen, Jifeng Liu   +3 more
doaj   +1 more source

Faint recombination lines in Galactic PNe with [WC] nucleus

, 2008
We present spatially resolved high-resolution spectrophotometric data for the planetary nebulae PB8, NGC2867, and PB6. We have analyzed two knots in NGC2867 and PB6 and one in PB8. The three nebulae are ionized by [WC] type nuclei: early [WO] for PB6 and
A. Peimbert, Acker, Acker, Aggarwal, Baluja, Baluja, Benjamin, Blöcker, Crowther, Davey, De Marco, Ercolano, Escalante, Escalante, Esteban, Esteban, Esteban, Feibelman, Feibelman, Galavís, García-Rojas, García-Rojas, Gesicki, Giles, Girard, Gorny, Grandi, Griffin, Guerrero, Górny, Henry, Herwig, J. García-Rojas, Jacoby, Kaler, Kaufman, Keenan, Kingdon, Kingsburgh, Kisielius, Koesterke, Kwitter, Lennon, Liu, Liu, Liu, Liu, Liu, M. Peña, McLaughlin, Medina, Medina, Mendoza, Mendoza, Mendoza, Mendoza, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Pequignot, Peña, Peña, Peña, Porter, Porter, Pradhan, Ramsbottom, Rola, Ruiz, Sawey, Seaton, Shaw, Storey, Storey, Storey, Tayal, Torres-Peimbert, Tsamis, Tsamis, Tylenda, Tylenda, Wang, Wesson, Wesson, Wesson, Zeippen, Zhang   +92 more
core   +1 more source

Proton Acceleration with Relativistic Electromagnetic Shock

Advanced Science, Volume 12, Issue 30, August 14, 2025.
New Ion Acceleration Mechanism! A novel cosmic‐ray proton acceleration mechanism is proposed, where relativistic electromagnetic shocks accelerate protons transversely. Hamiltonian analysis yields a scaling law linking the proton energy to the minimum longitudinal thickness of the shock.
Ting Xiao, Xiaomei Zhang, Fanqiu Kong, Xiaolong Zheng, Zheng Gong, Baifei Shen   +5 more
wiley   +1 more source

Testing Cluster Membership of Planetary Nebulae with High-precision Proper Motions. II. HST Observations of PHR J1315–6555 in the Open Cluster AL 1 (ESO 96-SC04)

The Astronomical Journal
Planetary nebulae (PNe) shown to be members of star clusters provide information on their properties and evolutionary histories that cannot be determined for PNe in the field, in particular the initial masses of their progenitor stars.
Andrea Bellini, Howard E. Bond, Kailash C. Sahu   +2 more
doaj   +1 more source

The evolution of planetary nebulae IV. On the physics of the luminosity function

, 2007
The nebular evolution is followed from the vicinity of the asymptotic-giant branch across the Hertzsprung-Russell diagram until the white-dwarf domain is reached, using various central-star models coupled to different initial envelope configurations ...
Blöcker, C. Sandin, Chevalier, Ciardullo, Corradi, D. Schönberner, Dopita, Dopita, Dopita, Dopita, Franco, Gabler, Gesicki, Gruenwald, Górny, Herwig, Herwig, Herwig, Latter, Leuenhagen, M. Steffen, Marigo, Marigo, Marten, Meatheringham, Meatheringham, Méndez, Méndez, Méndez, Paczynski, Perinotto, Perinotto, R. Jacob, Schönberner, Schönberner, Schönberner, Shaw, Shu, Stanghellini, Stasinska, Steffen, Vassiliadis, Vilkoviskii, Volk, Weinberger, Zhang   +45 more
core   +1 more source

UV (IUE) spectra of the central stars of high latitude planetary nebulae Hb7 and Sp3 [PDF]

, 2001
We present an analysis of the UV (IUE) spectra of the central stars of Hb7 and Sp3. Comparison with the IUE spectrum of the standard star HD 93205 leads to a spectral classification of O3V for these stars, with an effective temperature of 50,000 K.
Aller, Blöcker, Cahn, Cerruti-Sola, Daub, G. Gauba, Gorny, Gussie, M. Parthasarathy, Parthasarathy, Parthasarathy, Patriarchi, Pauldrach, Preite-Martinez, Prinja, Prinja, Samland, Savage, T. Fujii, Tylenda, Wood, Y. Nakada   +21 more
core   +2 more sources

Apparent magnitudes of luminous planetary nebula nuclei. II - A survey of southern hemisphere planetary nebulae

The Astrophysical Journal Supplement Series, 1989
Narrow-band continuum and emission-line photometry of 145 southern hemisphere PN are presented. Total fluxes in the important nebular lines He II 4686 A, H-beta, forbidden O III 4959, H-alpha, and forbidden N II 6583 A are measured and used to determine the nebular distances and ionizations, interstellar reddenings, and He(2+) abundances and to derive ...
Richard A. Shaw, James B. Kaler
openaire   +1 more source

Testing Cluster Membership of Planetary Nebulae with High-precision Proper Motions. I. HST Observations of JaFu 1 Near the Globular Cluster Palomar 6

The Astronomical Journal
If a planetary nebula (PN) is shown to be a member of a star cluster, we obtain important new constraints on the mass and chemical composition of the PN’s progenitor star, which cannot be determined for PNe in the field.
Howard E. Bond, Andrea Bellini, Kailash C. Sahu   +2 more
doaj   +1 more source

Planetary nebulae, tracers of stellar nucleosynthesis

, 2006
We review the information that planetary nebulae and their immediate progenitors, the post-AGB objects, can provide to probe the nucleosynthesis and mixing in low and intermediate mass stars.
Balser, Balser, Becker, Burbidge, Charbonnel, Charbonnel, Charbonnel, Dinerstein, Forestini, G. Stasińska, Gustafsson, Górny, Górny, Hamann, Henry, Henry, Howard, Iben, Jacoby, Kingsburgh, Leisy, Leisy, Liu, Liu, Livio, Marigo, Marigo, Martín-Hernández, Moe, Napiwotzki, Palla, Palla, Peimbert, Peimbert, Perinotto, Peña, Prantzos, Péquignot, Rauch, Richer, Richer, Rubin, Sharpee, Soker, Stasińska, Stasińska, Sterling, Sterling, Sterling, Szczerba, Todt, Torres-Peinbert, Tovmassian, van den Hoek, Weidemann, Werner, Werner, Werner, Zhang, Zoccali   +59 more
core   +2 more sources

Hubble Space Telescope Images of Magellanic Cloud Planetary Nebulae: Data and Correlations across Morphological Classes [PDF]

, 1998
The morphology of planetary nebulae (PNe) provides an essential tool for understanding their origin and evolution, as it reflects both the dynamics of the gas ejected during the TP-AGB phase, and the central star energetics.
Barlow M. J., Boffi F. R., Bond H. E., Cahn J. H., Calvet N., Corradi R. L. M., Hasan H., J. C. Blades, Kingsburgh R. L., Kingsburgh R. L., L. Stanghellini, Liu X.-W., M. J. Barlow, Munch G., Richardson W. H., Robinson G. J., S. J. Osmer, Sabbadin F., Schwarz H. E., Stanghellini L., Weinberger R., X.–W. Liu   +21 more
core   +2 more sources