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There are online programs to calculate habitable zones. Here is a link to one: https://depts.washington.edu/naivpl/content/hz-calculator[1] But I have to warn you that such calculators suffer from problems. It is rather difficult to calculate the circumstellar habitable zone for a star, especially since the albedo, atmosphere, and other qualities, of planet ...

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A friend of mine may have answered this for me: he said to basically assume stars act as black body radiators, in which case I can find what I want from Planck's law and some calculus.

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The Gaia EDR3 catalogue gives a parallax of $10.965 \pm 0.028$ milli-arcseconds. This differs from the DR2 parallax by 0.115 milli-arcseconds. This is not unexpected because there are systematic errors of order 0.1 milli-arcsec in the DR2 parallaxes. The new EDR3 parallax is expected to have systematic errors that are no bigger than the statistical error bar ...

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It's not physically impossible, but it's so improbable that it may as well be so. You would need every tumbling dust grain and swirl of gas to exactly cancel out the rotation of all the other bits of matter that came together to form the star. If that did happen, the most minuscule disturbance would turn it from a non-rotating star into a slowly-rotating ...

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It is impossible. After the star is "born", it will be rotating because of angular momentum from the place it was formed (most likely a nebula, which is the aftermath of a supernova). Even if there are extremely large amounts of magnetic, tidal, etc. forms of weakening the star's rotation, they will weaken as the star's rotation weakens. The stars ...

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As @ProfRob already stated, there is no single star database with all parameters. Here are some resources: SIMBAD Astronomical Database GAIA Archive "providing astrometry, photometry, and spectroscopy of more than 1000 million stars in the Milky Way." A helpful and extensive collection of online resources is collected as community wiki answer to ...

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