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28 Andromedae

Star in the constellation Andromeda

Star in the constellation Andromeda

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28 Andromedae (abbreviated 28 And) is a Delta Scuti variable star in the constellation Andromeda. 28 Andromedae is the Flamsteed designation. It also bears the variable star name GN Andromedae. Its apparent magnitude is 5.214, varying by less than 0.1 magnitudes.

Description

28 Andromedae is an A-type giant star, meaning it is colored bluish-white. Parallax estimates made by the Hipparcos spacecraft put the star at a distance of about 199 light years (61 parsecs). It is moving towards the solar system at a velocity of .

Multiplicity of the system

Two stars near 28 Andromedae share a common proper motion with the primary star, which is then a candidate triple system. The orbital parameters are currently unknown. The second and third component have masses of and respectively.

Variability cycle

28 Andromedae A is a Delta Scuti variable, so it displays small luminosity variations at timescales less than a day due to star pulsation. There is evidence for two periodic cycles of 5,014 and 5,900 seconds, respectively. The amplitude variations, though, are not constant in time, and the pulsation modes are not radial.

References

References

  1. Høg, E.. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics.
  2. (1974). "MK Spectral Types for Some Bright F Stars". Publications of the Astronomical Society of the Pacific.
  3. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data.
  4. Gontcharov, G. A.. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters.
  5. (1986). "The atmospheric parameters and spectral interpolator for the MILES stars". Astronomy & Astrophysics.
  6. (1985). "Light variations of 28 Andromedae". Astronomy & Astrophysics.
  7. (1998). "Extreme amplitude variations in 28 And". Astronomy and Astrophysics.
  8. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
  9. (2014). "The VAST Survey - III. The multiplicity of A-type stars within 75 pc". Monthly Notices of the Royal Astronomical Society.
  10. (2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics.
  11. {{cite DR2. 2858826134543154304
  12. (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.
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andromeda-(constellation) delta-scuti-variables flamsteed-objects henry-draper-catalogue-objects bright-star-catalogue-objects hipparcos-objects durchmusterung-objects a-type-giants objects-with-variable-star-designations
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