Did Neil deGrasse Tyson publish any real physics research? Or just shitpureshit?
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Date: January 30th, 2022 9:28 AM Author: diverse lodge
Damn, that's weak sauce
https://ui.adsabs.harvard.edu/abs/1992PhDT.........1T/abstract
A Study of the Abundance Distributions Along the Minor Axis of the Galactic Bulge
Tyson, Neil Degrasse
Abstract
I present abundance distribution functions for fields along the minor axis of the Galactic bulge based on CCD photometric observations toward seven windows of low extinction. Abundance distribution functions are the most useful form of data to constrain models of the star formation and the chemical enrichment of the bulge. By using the recently-calibrated Washington photometric filter system, the distribution function in (Fe/H) is determined for each field, and consequently I derive the abundance gradient for the bulge. To supplement these observations I analyzed, from medium dispersion spectra, line strengths of the 33 known bulge carbon stars. The radial velocities of these carbons stars and of 39 bulge RR Lyrae variables is also presented. Within 8 degrees of the Galactic center ( ~1 kpc) there appears to be no appreciable gradient in the distribution of (Fe/H), which is consistent with a dissipationless collapse, and/or sufficient mixing during the star-forming epoch when Fe was produced in the bulge. The mean abundance over this region is between two and five times solar. The form of these distributions is well-fitted by the simple (closed box) model of chemical evolution where the bulge is self-enriched by processing its original gas content to completion. This result carries two direct implications: (1) the inner bulge was not significantly enriched by infall (of any heavy element abundance) from the halo or the disk, (2) the inner bulge underwent no catastrophic mass-loss from supernova-driven winds or any other mechanism. These scenarios would produce a different signature in the abundance distributions. Beyond 8 degrees from the Galactic center, the mean of the abundance distribution drops precipitously with an abundance gradient of -0.2 dex/degree in (Fe/H). This is consistent with the notion that the inner bulge is chemically distinct from the halo while the transition region is a blending of the two. It may be possible to use kinematics to disentangle the two populations via a radial velocity survey.
(http://www.autoadmit.com/thread.php?thread_id=5019833&forum_id=2#43873222)
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Date: January 30th, 2022 12:44 PM Author: curious forum
Check out the title in http://scholar.google.com
“A Study of the Abundance Distributions Along the Minor Axis of the Galactic Bulge“
The thesis has been cited 0 times, and the journal article he wrote based on it has been cited only 3 times in the 29 years since it’s been published. That’s unbelievably low impact work, like we’re talking ¡Jeb!-level low energy, sad. (Especially for a “famous” scientist—if there were any point to the thesis at all it or the paper would be cited a lot.)
(http://www.autoadmit.com/thread.php?thread_id=5019833&forum_id=2#43874167) |
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