Concept information
Terme préférentiel
accretion rate
Définition(s)
- The amount of mass accreted during unit time. The accretion rate for the collapse of a singular isothermal sphere is expressed by: dM/dt = 0.975 c_s³/G, where cs is the isothermal sound speed (Shu 1977, ApJ 214, 488). This relation can be written as: dM/dt = 4.36 x 10⁻⁶ (T/20 K)³/2) in units of solar masses per year, where T is the temperature. Observed temperatures of 10-20 K in regions of low-mass star formation imply accretion rates of about 10⁻⁶ to 10⁻⁵ solar masses per year. Accretion rates for massive stars amount to values of 10⁻⁴ to 10⁻³ solar masses per year. (An Etymological Dictionary of Astronomy and Astrophysics, by M. Heydari-Malayeri, https://dictionary.obspm.fr/index.php?formSearchTextfield=accretion+rate&formSubmit=Search&showAll=1)
Concept(s) générique(s)
Traductions
-
français
URI
http://data.loterre.fr/ark:/67375/MDL-C4WCV09F-P
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