Surf Wiki
Save to docs
science/astronomy

From Surf Wiki (app.surf) — the open knowledge base

25 Aquarii

Single, K-type star in the constellation Aquarius

Summary

Single, K-type star in the constellation Aquarius

d Aquarii

| b-v = +1.032 | u-b = +0.90

25 Aquarii (abbreviated 25 Aqr) is a single star in the equatorial constellation of Aquarius. 25 Aquarii is the modern Flamsteed designation; in the past it held the designation 6 Pegasi. It also bears the Bayer designation of d Aquarii. It is located near the border with the modern Pegasus constellation. Although faint at an apparent visual magnitude of +5.09, it is bright enough to be viewed from suburban skies. Based upon an annual parallax shift of , it is located at a distance of around 247 ly from Earth. The visual magnitude of the star is diminished by 0.09 from extinction caused by intervening gas and dust.

The spectrum of this star matches a stellar classification of K0 III, with the luminosity class of III indicating that this is a giant star that has evolved away from the main sequence after exhausting the supply of hydrogen at its core. It belongs to a population known as clump giants and hence is generating energy through the nuclear fusion of helium at the core. The outer envelope has expanded to 11 times the radius of the Sun and it is radiating 54 times the Sun's luminosity. This energy is being emitted from the stellar atmosphere at an effective temperature of , causing it to glow with the orange hue of a K-type star.

References

References

  1. {{cite Gaia DR3. 2694414129322277504
  2. {{cite constellation. 25 Aqr
  3. (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics.
  4. Wagman, M.. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy.
  5. (January 2008). "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity". The Astronomical Journal.
  6. (1966). "UBV photometry of 550 F, G and K type stars". [[Monthly Notices of the Royal Astronomical Society]].
  7. "* d Aqr".
  8. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society.
  9. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics.
  10. (December 21, 2004). "The Colour of Stars". [[Commonwealth Scientific and Industrial Research Organisation]].
  11. (August 2000). "K-Band Calibration of the Red Clump Luminosity". The Astrophysical Journal.
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

k-type-giants horizontal-branch-stars aquarius-(constellation) bayer-objects durchmusterung-objects flamsteed-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects
Want to explore this topic further?

Ask Mako anything about 25 Aquarii — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report