2 ms·
So how many stars of spectral type earlier than M8, so type O, B, A, F, G, K, and early M-type stars, are there within a 100 parsec (or 326 light-year) radius o
by fsiefken 3y ago
So how many stars of spectral type earlier than M8, so type O, B, A, F, G, K, and early M-type stars, are there within a 100 parsec (or 326 light-year) radius of the Sun? How would I go about finding an answer, is there an easily query-able database or astronomy app? GPT4 doesn't know, Wolfram Alpha doesn't know, last time I needed an astronomical answer I bought a ProjectPluto Guest license, but I lost the license.
- tetris11 3y agoIt's not much but the HEASARC has a bright star catalogue[1] that contains the MK classifications you want. https://heasarc.gsfc.nasa.gov/W3Browse/star-catalog/bsc5p.html https://heasarc.gsfc.nasa.gov/W3Browse/star-catalog/bsc5p.ht...
- GoblinSlayer 3y agoIf an average distance between stars is 4 light years, then within 400 light years are about a million stars.
- blackhaz 3y agoSumming up densities for O-K stars in [1] inside the volume of a sphere of r=100 pc, I end up with ~ 91,600 stars. If we include M dwarfs that number rises to ~ 375,000 stars. [1] https://www.pas.rochester.edu/~emamajek/memo_star_dens.html https://www.pas.rochester.edu/~emamajek/memo_star_dens.html