Red dwarf star
Kaler, James B. Department of Astronomy, College of Liberal Arts and Sciences, University of Illinois, Urbana-Champaign, Illinois.
- Additional Reading
A low-mass main-sequence star of spectral classes M and L. Red dwarf stars range from somewhat over half a solar mass at class M0 down to just under 0.08 solar mass in cool M and warm L, below which the proton-proton chain cannot run. Lower-mass bodies are termed brown dwarfs. At the transition, within class L (even, for young stars, class M), the two are difficult to distinguish. Effective temperatures range from 3800 K (6400°F) at class M0 down to about 2400 K (3900°F) at class L0, and absolute visual magnitudes from +9 to +20. Downward along the main sequence, red dwarfs produce progressively more radiation in the infrared. Bolometric corrections (which account for invisible radiation) range from around −1.2 to −7 magnitudes, so luminosities range from about 0.1 down to 2 × 10−4 the solar luminosity. Radii range from about two-thirds that of the Sun down to about one-tenth. Spectra become increasingly complex, with titanium oxide and neutral metals appearing at the warm end of class M, these and vanadium oxide appearing toward the cool end, and neutral alkali metals and metal hydrides appearing in class L. See also: Brown dwarf; Magnitude (astronomy); Proton-proton chain
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information