OU Andromedae

OU Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 49m 40.961s[1]
Declination +36° 25′ 31.01″[1]
Apparent magnitude (V) 5.87 - 5.94[2]
Characteristics
Spectral type G1 IIIe[3]
B−V color index 0.79[3]
Variable type FK Com[2]
Astrometry
Radial velocity (Rv)0.7 km/s
Proper motion (μ) RA: 1.01 ± 0.41[1] mas/yr
Dec.: -47.59 ± 0.26[1] mas/yr
Parallax (π)7.71 ± 0.34[1] mas
Distance420 ± 20 ly
(130 ± 6 pc)
Details[4]
Mass2.8−3.1 M☉
Radius10−13 R☉
Luminosity61−104 L☉
Temperature5,110 K
Rotation23 d
Rotational velocity (v sin i)21.5[3] km/s
Other designations
FK5 3914, HIP 117503, SAO 73535, BD+35° 5110, HR 9024, HD 223460.
Database references
SIMBADdata

OU Andromedae is a rotationally variable star. It has an X-ray emission of 8.2 × 1030 erg s−1.[5] Varying between magnitudes 5.87 and 5.94, it has been classified as an FK Comae Berenices variable. It has an unusually high rate of spin for an evolved star of this type, showing a projected rotational velocity of 21.5 km/s. One possible explanation is that it may have engulfed a nearby giant planet, such as a hot Jupiter.[3]

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 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. Bibcode:2009yCat....102025S.
  3. 1 2 3 4 Rodrigues da Silva, R.; et al. (March 2015). "On the Nature of Rapidly Rotating Single Evolved Stars". The Astrophysical Journal. 801 (1): 6. arXiv:1503.03447. Bibcode:2015ApJ...801...54R. doi:10.1088/0004-637X/801/1/54. 54.
  4. ↑ Gondoin, P. (December 2005), "The relation between X-ray activity and rotation in intermediate-mass G giants", Astronomy and Astrophysics, 444 (2): 531–538, Bibcode:2005A&A...444..531G, doi:10.1051/0004-6361:20053567.
  5. ↑ Gondoin, P. (December 1999), "Evolution of X-ray activity and rotation on G-K giants", Astronomy and Astrophysics, 352: 217–227, Bibcode:1999A&A...352..217G
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