To install click the Add extension button. That's it.
The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.
How to transfigure the Wikipedia
Would you like Wikipedia to always look as professional and up-to-date? We have created a browser extension. It will enhance any encyclopedic page you visit with the magic of the WIKI 2 technology.
Try it — you can delete it anytime.
Install in 5 seconds
Yep, but later
4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
BL Herculis variables are a subclass of type II Cepheids with low luminosity and mass, that have a period of less than eight days.[2][3] They are pulsating stars with light curves that frequently show a bump on the descending side for stars of the shortest periods and on the ascending side for longer period stars.[3] Like other type II Cepheids, they are very old population II stars found in the galaxy’s halo and globular clusters.[4] Also, compared to other type II Cepheids, BL Herculis variables have shorter periods and are fainter than W Virginis variables. Pulsating stars vary in spectral class as they vary in brightness and BL Herculis variables are normally class A at their brightest and class F when most dim.[5] When plotted on the Hertzsprung–Russell diagram they fall in-between W Virginis and RR Lyrae variables.[4]
The prototype star, BL Herculis, varies between magnitude 9.7 and 10.6 in a period of 1.3 days. The brightest BL Herculis variables, with their maximum magnitudes, are:[5]
The BL Herculis stars show a wide variety of light curves, temperatures, and luminosity, and three subdivisions of the class have been defined, with the acronym AHB referring to above horizontal branch:[6][7][8]
XX Virginis stars (AHB1), with very fast rises to maximum and low metallicity
CW stars (AHB2), W Virginis variables, longer periods, the bump on the ascending leg
BL Herculis stars (AHB3), shorter periods, the bump on the descending leg
YouTube Encyclopedic
1/3
Views:
456
453
3 665
Hercules Blender Review 5
Hercules Blender Review 9
El universo 16 Otros objetos celestes
Transcription
References
^"Light Curve". Hipparcos ESA. ESA. Retrieved 17 February 2022.
^Wallerstein, George (2002). "The Cepheids of Population II and Related Stars". The Publications of the Astronomical Society of the Pacific. 114 (797): 689–699. Bibcode:2002PASP..114..689W. doi:10.1086/341698.
^ abSoszyński, I.; Udalski, A.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Wyrzykowski, Ł.; Szewczyk, O.; Ulaczyk, K.; Poleski, R. (2008). "The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. II.Type II Cepheids and Anomalous Cepheids in the Large Magellanic Cloud". Acta Astronomica. 58: 293. arXiv:0811.3636. Bibcode:2008AcA....58..293S.
^ ab"General Catalogue of Variable Stars". GCVS. Institute of Astronomy of Russian Academy of Sciences and Sternberg State Astronomical Institute. Retrieved 31 May 2013.
^Diethelm, R. (1983). "A photometric classification of pulsating variables with periods between one and three days". Astronomy and Astrophysics. 124: 108. Bibcode:1983A&A...124..108D.
^Diethelm, R. (1996). "Period changes of AHB1 variables". Astronomy and Astrophysics. 307: 803. Bibcode:1996A&A...307..803D.
This page was last edited on 23 August 2022, at 18:26