KZ Andromedae

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KZ Andromedae
KZAndLightCurve.png
A light curve for KZ Andromedae, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Andromeda
Right ascension 23h 09m 57.3642s [2]
Declination +35° 32′ 55.658″ [2]
Apparent magnitude  (V)7.91 –8.03 variable [3]
Characteristics
Spectral type K2Ve+K2Ve [3]
Apparent magnitude  (B)8.81 [4]
Apparent magnitude  (V)7.93 [4]
Apparent magnitude  (G)7.6580 [2]
Apparent magnitude  (J)6.225 [5]
Apparent magnitude  (H)5.778 [5]
Apparent magnitude  (K)5.659 [5]
Variable type BY Dra [3]
Astrometry
Radial velocity (Rv)−5.818±0.026 [6] km/s
Proper motion (μ)RA: 150.123±0.063 [2] mas/yr
Dec.: 1.226±0.059 [2] mas/yr
Parallax (π)32.8449±0.0369  mas [2]
Distance 99.3 ± 0.1  ly
(30.45 ± 0.03  pc)
Orbit [6]
Period (P)3.03291126±0.00000046 days
Eccentricity (e)0.01174±0.00056
Periastron epoch (T)HJD 2455133.480±0.020
Argument of periastron (ω)
(secondary)		7.11±2.35°
Semi-amplitude (K1)
(primary)		69.362±0.046 km/s
Semi-amplitude (K2)
(secondary)		71.300±0.054 km/s
Details [6]
Primary
Radius 0.77±0.07  R☉
Luminosity 0.34±0.06  L☉
Rotational velocity (v sin i)12.5 km/s
Secondary
Radius 0.66±0.06  R☉
Luminosity0.25±0.04  L☉
Rotational velocity (v sin i)12.2 km/s
Other designations
2E 4687, 2MASS J23095734+4757300, BD+47 4058, EUVE J2309+47.9, HD  218738, HIP  114379, GJ 4315, TYC 3627-1822-1, NLTT  2314, SAO 52753, WDS  J23100+4758B
Database references
SIMBAD data

KZ Andromedae (often abbreviated to KZ And) is a double lined spectroscopic binary in the constellation Andromeda. Its apparent visual magnitude varies between 7.91 and 8.03 during a cycle slightly longer than 3 days.

Contents

System

Both stars in the KZ Andromedae system are main sequence stars of spectral type K2Ve, meaning that the spectrum shows strong emission lines. [3] This is caused by their active chromospheres that cause large spots on the surface. [6]

KZ Andromedae is listed in the Washington Double Star Catalog as the secondary component in a visual binary system, with the primary being HD 218739. In 50 years of observations, there is little evidence of relative motion between the two stars; however, they have a common proper motion and a similar radial velocity. [6]

Variability

The rotational velocity of both stars is consistent with a synchronous rotation of the pair, and the rotational period is itself comparable to the brightness variation period. KX Andromedae is thus classified as a BY Draconis variable, and the variability is caused by the large spots on the surface. [6]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 5 6 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. 1 2 3 4 N. N. Samus; O. V. Durlevich; et al. "KZ And database entry". Combined General Catalog of Variable Stars (2004 ed.). CDS . Retrieved 2018-11-12.
  4. 1 2 "KZ And". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 12, 2018.
  5. 1 2 3 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  6. 1 2 3 4 5 6 Fekel, F. C.; Henry, G. W.; Tomkin, J. (September 2017). "New Precision Orbits of Bright Double-lined Spectroscopic Binaries. X. HD 96511, HR 7578, and KZ Andromedae". The Astronomical Journal. 154 (3): 13. Bibcode:2017AJ....154..120F. doi: 10.3847/1538-3881/aa816e . 120.
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