What does WELS mean in UNCLASSIFIED
WELS stands for Weak Emission Line Star. These stars are characterized by their faint emission lines in their spectra, which are caused by the presence of ionized gas in their atmospheres. WELS are typically old, low-mass stars that have evolved off the main sequence and are now in the red giant branch or asymptotic giant branch.
WELS meaning in Unclassified in Miscellaneous
WELS mostly used in an acronym Unclassified in Category Miscellaneous that means Weak Emission Line Star
Shorthand: WELS,
Full Form: Weak Emission Line Star
For more information of "Weak Emission Line Star", see the section below.
Characteristics of WELS
- Spectral Features: WELS exhibit weak emission lines in their spectra, particularly in the hydrogen Balmer series. These lines are often accompanied by absorption lines of the same elements.
- Age and Evolution: WELS are typically old stars that have exhausted their hydrogen fuel supply and evolved off the main sequence. They are often found in globular clusters and other old stellar populations.
- Mass: WELS are low-mass stars, typically with masses below about 3 solar masses.
- Luminosity: WELS are relatively faint stars, with luminosities ranging from a few hundred to a few thousand times that of the Sun.
- Variability: Some WELS exhibit variability in their brightness, which can be caused by pulsations or changes in their surface activity.
Essential Questions and Answers on Weak Emission Line Star in "MISCELLANEOUS»UNFILED"
What is a Weak Emission Line Star (WELS)?
WELS are stars that exhibit weak emission lines in their spectra, indicating the presence of ionized gas in their atmospheres. These emission lines are formed when electrons in the gas are excited and then return to their ground state, releasing energy in the form of light.
What causes the emission lines in WELS?
The emission lines in WELS are typically caused by a combination of factors, including stellar activity (such as flares and coronal mass ejections), chromospheric heating, and magnetic fields. These processes can ionize the gas in the star's atmosphere, leading to the emission of light.
How are WELS different from other types of stars?
WELS are characterized by their weak emission lines, which distinguish them from stars that exhibit strong emission lines (such as Be stars and T Tauri stars). Additionally, WELS tend to have lower surface temperatures and slower rotation rates compared to other types of stars.
What are the spectral characteristics of WELS?
WELS typically exhibit weak emission lines of hydrogen (Hα), calcium (Ca II), and iron (Fe II). These lines are often narrow and have a low intensity, which can make them difficult to detect.
Where are WELS found in the sky?
WELS are found throughout the Milky Way galaxy and can be identified in both open and globular clusters. They are also commonly observed in star-forming regions and near young stellar objects.
Final Words: WELS are old, low-mass stars that are characterized by their weak emission lines in their spectra. They play an important role in understanding the evolution of stars and the chemical enrichment of the Universe. By studying WELS, astronomers can gain insights into the properties and behaviors of these ancient celestial objects.
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