Results 1 to 10 of about 2,568,937 (145)

Planetary Nebulae: Sources of Enlightenment [PDF]

PASP, 134, Number 022001, 2022, 2021
In this review/tutorial we explore planetary nebulae as a stage in the evolution of low-to-intermediate-mass stars, as major contributors to the mass and chemical enrichment of the interstellar medium, and as astrophysical laboratories. We discuss many observed properties of planetary nebulae, placing particular emphasis on element abundance ...
arxiv   +1 more source

Open Letter to the Pontiff and Vatican Cardinals on Pervasively Corrupt Earth, Planetary, and Astrophysical Science

Advances in Social Sciences Research Journal, 2023
Five hundred years ago the Roman Catholic Church wrongly opposed science. In my fifty years as a scientist, I have observed the Catholic Church reaching out to science, wholly unaware of widespread corruption and cartel-like behavior under guise of science, which leads, I allege, to the Vatican aiding and abetting activities that are not only anti ...
openaire   +1 more source

Taking the Measure of the Universe: Precision Astrometry with SIM PlanetQuest [PDF]

, 2007
Precision astrometry at microarcsecond accuracy has application to a wide range of astrophysical problems. This paper is a study of the science questions that can be addressed using an instrument that delivers parallaxes at about 4 microarcsec on targets
Alan L. Fey, Andreas Quirrenbach, Andrew P. Gould, Angelle M. Tanner, Ann E. Wehrle, Bahcall J., Baraffe I., Bisikalo D. V., Bouvier J., Bouvier J., Brian C. Chaboyer, Caldwell J. A. R., Carl Grillmair, Catanzarite J. H., Chaboyer B., Charles A. Beichman, Christopher R. Gelino, Ciardi D. R., David Boboltz, David L. Meier, David R. Ciardi, Dayton L. Jones, Debra A. Fischer, Duquennoy A., Edward J. Shaya, Feast M., Fey A. L., Franciosini E., Geoffrey W. Marcy, Gliese W., Guy Worthey, Herrero A., Herrero A., Hog E., Ibata R. A., Jo Eliza Pitesky, John A. Tomsick, Joseph H. Catanzarite, Kathryn V. Johnston, Kenneth J. Johnston, Kovalevsky J., Krolik J., Kroupa P., Laney C. D., Laskin R. A., Lestrade, Louis E. Strigari, Luyten W. J., Lynden-Bell D., Lynden-Bell D., Lynden-Bell D., Mayor M., McKee C., Mekkaden M. V., Merritt D., Michael Shao, Nicholas M. Law, Pakzad S. L., Pan X., Pan X., Peebles P. J. E., Pont F., Pont F., Refsdal S., Richard J. Patterson, Rob P. Olling, Ronald J. Allen, Schaller G., Schussler M., Schweickhardt J., Shakura N. I., Shrinivas R. Kulkarni, Stephen C. Unwin, Stephen J. Edberg, Steven R. Majewski, Strassmeier K. G., Stuart B. Shaklan, Szabados L., Todd J. Henry, Tomsick J. A., Unwin S. C., Valeri V. Makarov, Will C. M., Xiaopei Pan   +83 more
core   +2 more sources

Shaping Proto-Planetary and Young Planetary Nebulae with Collimated Fast Winds [PDF]

Astrophys.J. 586 (2003) 319-337, 2002
Using two-dimensional hydrodynamical simulations, we investigate the interaction of a collimated fast wind (CFW) interacting with a spherical asymptotic giant branch (AGB) wind as the mechanism for shaping proto-planetary nebulae and young planetary nebulae.
arxiv   +1 more source

New Close Binary Central Stars of Planetary Nebulae from Gaia DR3 Epoch Photometry [PDF]

, 2022
Close binary interactions perform a key role in the formation and shaping of planetary nebulae. However only a small fraction of Galactic planetary nebulae are known to host close binary systems. Many such systems are detectable through photometric variability.
arxiv   +1 more source

Planetary nebulae in M32 and the bulge of M31: Line intensities and oxygen abundances [PDF]

, 1998
We present spectroscopy of planetary nebulae in M32 and in the bulge of M31 that we obtained with the MOS spectrograph at the Canada-France-Hawaii Telescope. Our sample includes 30 planetary nebulae in M31 and 9 planetary nebulae in M32. We also observed one H II region in the disk of M31. We detected [O III]$\lambda$4363 in 18 of the planetary nebulae,
arxiv   +1 more source

Bayesian analysis of interiors of HD 219134b, Kepler-10b, Kepler-93b, CoRoT-7b, 55 Cnc e, and HD 97658b using stellar abundance proxies [PDF]

, 2016
Using a generalized Bayesian inference method, we aim to explore the possible interior structures of six selected exoplanets for which planetary mass and radius measurements are available in addition to stellar host abundances: HD~219134b, Kepler-10b ...
Dorn, C., Hinkel, N. R., Venturini, J.
core   +2 more sources

Planetary Collisions: Electromagnetic Signals

, 2003
We investigate the electromagnetic signals accompanied with planetary collisions and their event rate, and explore the possibility of directly detecting such events.
Sigurdsson, Steinn, Zhang, Bing
core   +1 more source

The Mid-term and Long-term Solar Quasi-periodic Cycles and the Possible Relationship with Planetary Motions [PDF]

Astrophysics and Space Science, 2012, 2012
This work investigates the solar quasi-periodic cycles with multi-timescales and the possible relationships with planetary motions. The solar cycles are derived from long-term observations of the relative sunspot number and microwave emission at frequency of 2.80 GHz. A series of solar quasi-periodic cycles with multi-timescales are registered.
arxiv   +1 more source

Breakthrough capability for the NASA Astrophysics Explorer Program: Reaching the darkest sky

, 2012
We describe a mission architecture designed to substantially increase the science capability of the NASA Science Mission Directorate (SMD) Astrophysics Explorer Program for all AO proposers working within the near-UV to far-infrared spectrum.
Benson, S. W., Falck, R. D., Fixsen, D. J., Gardner, J. P., Garvin, J. B., Greenhouse, M. A., Kruk, J. W., Oleson, S. R., Thronson, H. A.   +8 more
core   +1 more source