Self-certification. Employers can also ask employees to fill in a form when they return to work to confirm theyâve been off sick for up to 7 days. This is called âself-certificationâ. Employers usually provide their own version of this form.elf-certification. Employers can also ask employees to fill in a form when they return to work to confirm theyâve been off sick for up to 7 days. This is called âself-certificationâ. Employers usually provide their own version of this form.
Â· just now. 1  The most massive stars (OB stars) have the shortest life. K and M stars are the least massive and have the longest lives. 2  McGarnigle is the most correct here. Type O and B are the hottest, most massive stars and, by virtue of their extreme mass, are the shortest lived.
1 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. 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.