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9 Boötis

Star in the constellation Boötes

Summary

Star in the constellation Boötes

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9 Boötis is a single, variable star in the northern constellation of Boötes, located around 630 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.0. This object is moving closer to the Earth with a heliocentric radial velocity of −41 km/s.

This is an aging giant star with a stellar classification of K3 III, which indicates it has exhausted the hydrogen at its core and evolved of the main sequence. As a consequence, its outer atmosphere has swollen to 44 times the radius of the Sun. It is a suspected irregular variable that ranges in photographic magnitude from 6.1 down to 6.6. 9 Boötis is considered mildly lithium-rich with a moderate level of chromospheric activity. It is radiating 857 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,197 K.

References

| display-authors=1 | last1=Rebull | first1=Luisa M.

| display-authors=1 | last1=Samus | first1=N. N.

| access-date=2019-04-26 | postscript=. }}

References

  1. "9 Boo".
  2. {{cite Gaia DR3. 1451072022557616000
  3. (2000). "The Nature of the lithium rich giants. Mixing episodes on the RGB and early-AGB". Astronomy and Astrophysics.
Wikipedia Source

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k-type-giants suspected-variables irregular-variables boötes durchmusterung-objects flamsteed-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects asymptotic-giant-branch-stars
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