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Psi9 Aurigae

Star in the constellation Auriga

Star in the constellation Auriga

| r-i = | v-r = | b-v = −0.06 | u-b = −0.46 Psi9 Aurigae is a star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ψ9 Aurigae, and abbreviated Psi9 Aur or ψ9 Aur. This star is dimly visible to the naked eye with an apparent visual magnitude of 5.75. Based upon an annual parallax shift of , the distance to this star is approximately 950 ly. It is drifting closer to the Sun with a radial velocity of −41 km/s. This is most likely (88.5% chance) a runaway star, having a peculiar velocity of 31.8 km/s.

The spectrum of Psi9 Aurigae matches a giant star with a stellar classification of B8 IIIe. The 'e' suffix indicates this is a Be star that shows emission lines of hydrogen in its spectrum. This is caused by a circumstellar shell of hot gas. The emission undergoes variability on a time scale of sixteen years. This star is spinning rapidly with a projected rotational velocity of 235 km/s. It has 2.4 times the mass of the Sun and 3.7 times the Sun's radius. ψ9 Aur is radiating 868 times the luminosity of the Sun from its photosphere at an effective temperature of 9,573 K.

References

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References

  1. {{cite Gaia DR3. 954333422410452096
  2. (2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal.
  3. (2021). "RGB photometric calibration of 15 million Gaia stars". Monthly Notices of the Royal Astronomical Society.
  4. Wilson, Ralph Elmer. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institution of Washington.
  5. (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal.
  6. Crawford, D. L.. (February 1963). "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars". Astrophysical Journal.
  7. "* psi09 Aur".
  8. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy and Astrophysics.
  9. Ghosh, K. K.. (September 1989). "Search for rapid spectral variability in Psi(9) Aurigae". Publications of the Astronomical Society of the Pacific.
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b-type-giants be-stars runaway-stars auriga bayer-objects bright-star-catalogue-objects durchmusterung-objects henry-draper-catalogue-objects hipparcos-objects
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