QV Andromedae

QV Andromedae

A light curve for QV Andromedae, plotted from TESS data,[1] with the 5.23 day rotation period shown in red
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 01h 16m 24.4904s[2]
Declination +48° 04′ 56.00453″[2]
Apparent magnitude (V) 6.608 (variable) [3]
Characteristics
Spectral type B9IIIpSi[4]
Apparent magnitude (U) 6.23[5]
Apparent magnitude (B) 6.559[3]
Apparent magnitude (V) 6.608[3]
Apparent magnitude (G) 6.5628[2]
Apparent magnitude (J) 6.554[6]
Apparent magnitude (H) 6.638[6]
Apparent magnitude (K) 6.657[6]
U−B color index -0.35[7]
B−V color index -0.04335[3]
Variable type ACV
Astrometry
Radial velocity (Rv)−13.6±3[8] km/s
Proper motion (μ) RA: 9.696±0.121[2] mas/yr
Dec.: 2.699±0.166[2] mas/yr
Parallax (π)4.4041 ± 0.0914 mas[2]
Distance740 ± 20 ly
(227 ± 5 pc)
Details
Mass4.4[9] M☉
Luminosity266.63[10] L☉
Surface gravity (log g)3.541±0.039[9] cgs
Temperature12384±150[9] K
Rotational velocity (v sin i)49±15[9] km/s
Other designations
2MASS J01162450+4804561, BD+47 357, FK5 2085, HD 7546, HIP 5939, HR 369, SAO 37067, TYC 3268-835-1
Database references
SIMBADdata

QV Andromedae (abbreviated to QV And, also known as HR 369 in the Bright Star Catalogue) is an Alpha2 Canum Venaticorum variable in the constellation Andromeda. Its maximum apparent visual magnitude is 6.6, so it can be seen by the naked eye under very favourable conditions. The brightness varies slightly following a periodic cycle of approximately 5.23 days.[4]

The stellar classification of this star is B9IIIpSi,[4] where the pSi suffix indicates that the star shows peculiar chemical composition with stronger than usual silicon lines. This type of star is known as an Ap star, with the chemical peculiarities caused by strong magnetic fields and slow rotation leading to chemical stratification in the atmosphere.[7] The star is rotating at a projected rotational velocity of 49 km/s,[9] with up to 0.05 magnitude variation of brightness during one rotation cycle. This leads to the classification of the star as an Alpha2 Canum Venaticorum variable.[4]

The variability of QV Andromedae was first identified in 1975,[11] and confirmed from Hipparcos photometry.[12] It was assigned the variable star designation QV Andromedae in the 73rd namelist of variable stars in 1997.[13]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ a b c d Cite error: The named reference TYCHO was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference GCVS was invoked but never defined (see the help page).
  5. ^ "QV And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 17, 2018.
  6. ^ a b c Cite error: The named reference 2MASS Cat was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Renson2009 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference Huang2010 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference winzer was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference ibvs was invoked but never defined (see the help page).