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KK Andromedae

KK Andromedae

An ultraviole light curve of KK Andromedae, adapted from Hildebrandt (1975)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 01h 34m 16.62220s[2]
Declination +37° 14′ 13.8765″[2]
Apparent magnitude (V) 5.90[3]
Characteristics
Spectral type B9 IV[4]
U−B color index −0.3
B−V color index −0.067±0.001[3]
Variable type α2 CVn
Astrometry
Radial velocity (Rv)−1.4±1.8[5] km/s
Proper motion (μ) RA: +5.719[2] mas/yr
Dec.: −21.238[2] mas/yr
Parallax (π)7.4585 ± 0.1156 mas[2]
Distance437 ± 7 ly
(134 ± 2 pc)
Absolute magnitude (MV)+0.35[6]
Details
Mass3.07±0.06[7] M☉
Radius2.7±0.4[6] R☉
Luminosity91[6] L☉
Surface gravity (log g)3.914±0.020[8] cgs
Temperature11,729±50[8] K
Rotation0.67 days[6]
Rotational velocity (v sin i)163±10[8] km/s
Age225[9] Myr
Other designations
KK And, BD+36° 277, HD 9531, HIP 7321, HR 446, SAO 54788, PPM 66400[10]
Database references
SIMBADdata

KK Andromedae, also known as HD 9531, is a variable star in the northern constellation of Andromeda. It has an apparent visual magnitude of 5.90,[3] which places it near the lower limit of visibility to the naked eye even under good viewing conditions. An Alpha2 Canum Venaticorum variable, it varies in brightness by 0.012 magnitude every 0.66 days.[11] Based upon an annual parallax shift of 7.5 mas[2] as seen from Earth, it is located around 437 light years from the Sun. At that distance, the brightness of the star is diminished by an extinction of 0.26 magnitude due to interstellar dust.[9]

Cowley et al. (1969) assigned this star a stellar classification of B9 IV,[4] which would indicate it is a B-type star in the subgiant stage that has exhausted the hydrogen supply at its core and is expanding. It is a catalogued as an Ap star that displays an abnormal silicon abundance,[12] but has been reported to actually be a helium-weak chemically peculiar star.[13] The star has just over three times the mass of the Sun[7] and about 2.7[6] times the Sun's radius. It is an estimated 225[9] million years old and is spinning rapidly with a projected rotational velocity of 163 km/s[8] and a rotation period of 16 hours.[6] KK And is radiating 91[6] times the Sun's luminosity from its photosphere at an effective temperature of 11,729 K.[8]

  1. ^ Cite error: The named reference hildebrandt was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference aaa334_181 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference huang2010 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference AAVSOKK was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Renson2009 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Hric1990 was invoked but never defined (see the help page).

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