BOSTON â President Obama signed an executive order on Monday requiring federal contractors to provide up to seven days of paid sick leave a year, even as he accused Republican congressional leaders of endangering the economy and Republican presidential candidates of undercutting American workers.OSTON â President Obama signed an executive order on Monday requiring federal contractors to provide up to seven days of paid sick leave a year, even as he accused Republican congressional leaders of endangering the economy and Republican presidential candidates of undercutting American workers.
A dwarf star is a star of relatively small size and low luminosity. 1  Most main sequence stars are dwarf stars. The term was originally coined in 1906 when the Danish astronomer Ejnar Hertzsprung noticed that the reddest starsâclassified as K and M in the Harvard scheme could be divided into two distinct groups.
1 Yellow dwarfs are main-sequence (dwarf) stars with masses comparable to that of the Sun. 2  Orange dwarfs are K-type main-sequence stars. 3  A blue dwarf is a hypothesized class of very-low-mass stars that increase in temperature as they near the end of their main-sequence lifetime. Dwarf star alone generally refers to any main-sequence star, a star of luminosity class V. 2  Red dwarfs are low-mass main-sequence stars. 3  Yellow dwarfs are main-sequence (dwarf) stars with masses comparable to that of the Sun. 4  Orange dwarfs are K-type main-sequence stars.