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V4381 Sagittarii

Star in the constellation Sagittarius

Star in the constellation Sagittarius

| b-v=+0.856 | u-b=+0.279

V4381 Sagittarii is a star in the constellation Sagittarius. It was discovered to be a variable star in 1996, when the Hipparcos data was analysed. A white supergiant of spectral type A2/A3Iab, it is an Alpha Cygni variable that varies between apparent photographic magnitudes 6.57 and 6.62. Its visual apparent magnitude is about 6.54.

V4381 Sagittarii is associated with a small reflection and emission nebula, although it is not actually seen within the nebulosity. The nebula is catalogued as GN 18.05.6. It was first listed as VdB 113 and described as possibly associated with a loose open cluster. That name has since been used for the cluster itself, which is much more distant than the distance of V4381 Sagittarii derived from its Hipparcos parallax. The whole cluster is less than a quarter of a degree across, with dozens of members from 8th magnitude downwards. V4381 Sagittarii is listed as a probable member, while the nearby bright stars HD 165516 and WR 111 are considered unlikely to be members.

Distance estimations

The distance to V4381 remains poorly determined as of 2021. The 2018 research based on radio interferometry has measured 2.2 milliarcseconds parallax, while Gaia Early Data Release 3, based on optical astrometry, have resulted in measured parallax 0.6273.

References

References

  1. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
  2. (2012). "Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters". Astronomy & Astrophysics.
  3. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S.
  4. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". Astrophysical Journal.
  5. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters.
  6. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society.
  7. (2003). "Merged catalogue of reflection nebulae". Astronomy and Astrophysics.
  8. (1966). "A study of reflection nebulae". Astronomical Journal.
  9. (2008). "Tidal radii and masses of open clusters". Astronomy and Astrophysics.
  10. (2013). "Global survey of star clusters in the Milky Way. II. The catalogue of basic parameters". Astronomy & Astrophysics.
  11. (2018). "The Parallax of the Red Hypergiant VX SGR with Accurate Tropospheric Delay Calibration". The Astrophysical Journal.
  12. {{cite Gaia EDR3. 4069845455625999872
  13. "Hipparcos Tools Interactive Data Access". ESA.
  14. (January 1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars.
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sagittarius-(constellation) alpha-cygni-variables a-type-supergiants objects-with-variable-star-designations henry-draper-catalogue-objects hipparcos-objects durchmusterung-objects gould-objects
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