28 Andromedae is an
A-typegiant star,[4] 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).[2] It is moving towards the solar system at a velocity of 10.30
km/s.[7]
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 0.71
M☉ and 0.14
M☉ respectively.[13]
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.[14]
^Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30.
Bibcode:
2000A&A...355L..27H.
^
abMermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data.
Bibcode:
1986EgUBV........0M.
^Samus, N. N.; Durlevich, O. V.; et al. (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. 1: B/gcvs.
Bibcode:
2009yCat....102025S.