Sun (star) spots (size)

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My question is about sunspots size.

Does these spots have a 'typical' size for all kinds of stars (dwarves or super giants), or are they dependent on a star size? In another words, is the statement correct:

the bigger the star, so bigger the spots on it; if the star is smaller smaller so is the spots accordingly. [In comparing to the Sun of course]

edited Jun 30, 2021 at 12:48

B--rian

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asked Dec 25, 2020 at 21:05

Uri Shlomy

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$\begingroup$ I'd expect it be related to the magnetic field more (as a sun spot is a place of exceptionally strong magnetic field which supresses normal convection), and thus rotation and activity rather than size. $\endgroup$
– planetmaker
Dec 25, 2020 at 21:41
$\begingroup$ So, the size of spots depends by magnetic fields (depends by mass) and not by size of star itself? Hence, the biggest spots must be on neutron stars surface?? But radius of this about 20 km, there size of sunspots about 3K km and more.. $\endgroup$
– Uri Shlomy
Dec 25, 2020 at 22:09
$\begingroup$ The distance to Betelgeuse hasn't been measured accurately by parallax yet because it's brightness non-uniformities make it look like it's photocenter is moving around randomly. I don't know if these are sunspots proper, or material around the star though: Can New Horizons be used to measure the distance to Betelgeuse (despite its fickle photocenter)? and also What will it finally take to accurately measure the distance to Betelgeuse? $\endgroup$
– uhoh
Dec 25, 2020 at 22:34
$\begingroup$ For direct imaging of lumpy stellar disks see See also astronomy.stackexchange.com/a/34917/7982 and astronomy.stackexchange.com/a/34791/7982 $\endgroup$
– uhoh
Dec 25, 2020 at 22:34
2

$\begingroup$ This is a topic of contemporary research. $\endgroup$
– ProfRob
Jun 25, 2021 at 11:26

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