KX Andromedae

KX Andromedae (often abbreviated to KX And) is a spectroscopic binary star in the constellation Andromeda. Its apparent visual magnitude varies between 6.88 and 7.28.[2]

KX Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  23h 07m 06.2120s[1]
Declination +50° 11′ 32.4891″[1]
Apparent magnitude (V) 6.88 – 7.28 variable[2]
Characteristics
Spectral type B3pe+K1III[3]
Apparent magnitude (U) 6.79[4]
Apparent magnitude (B) 7.25[4]
Apparent magnitude (V) 6.92[4]
Apparent magnitude (G) 6.8227[1]
Apparent magnitude (J) 5.845[5]
Apparent magnitude (H) 5.33[4]
Apparent magnitude (K) 5.19[4]
Variable type Be star
Astrometry
Radial velocity (Rv)−7.8±0.9[6] km/s
Proper motion (μ) RA: 1.697±0.057 [1] mas/yr
Dec.: −0.788±0.048[1] mas/yr
Parallax (π)1.2444 ± 0.0328[1] mas
Distance2,620 ± 70 ly
(800 ± 20 pc)
Orbit[7]
Period (P)38.919 days
Eccentricity (e)0±0.03
Inclination (i)50±5°
Periastron epoch (T)HJD 2423220.25±0.09
Semi-amplitude (K2)
(secondary)		86.2±0.8 km/s
Details
Primary
Mass9.0±0.1[8] M☉
Age22.4±3.1[8] Myr
Secondary
Radius19±4[7] R☉
Surface gravity (log g)2.0±0.5[7] cgs
Temperature5000±400[7] K
Rotational velocity (v sin i)25±5[7] km/s
Other designations
2MASS J23070621+5011324, AAVSO 2302+49, BD+49 4045, HIP 114154, HD 218393, SAO 52701, TYC 3631-1533-1
Database references
SIMBADdata

The primary component of the KX Andromedae system is a Be star with a spectral classification B3pe.[2]

The secondary star is difficult to detect in the spectrum, but has been given a K1III spectral type. It is likely to be an asymptotic giant branch star that fills its Roche lobe.[7]

The system is only about 25 million years old. The pair complete a circular orbit every 38.919 days at an inclination of 50°.[7]

References
  1. 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.
  2. KX And, database entry, Combined General Catalog of Variable Stars (GCVS5.1, 2017 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed on line 2018-10-17.
  3. Shenavrin, V. I.; Taranova, O. G.; Nadzhip, A. E. (2011). "Search for and study of hot circumstellar dust envelopes". Astronomy Reports. 55 (1): 31–81. Bibcode:2011ARep...55...31S. doi:10.1134/S1063772911010070.
  4. Database entry, Catalogue of Stellar Photometry in Johnson's 11-color system (2002 Ed.), J. R. Ducati, CDS ID II/237 Accessed on line 2018-11-10.
  5. Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; et al. (June 2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 55 (2246): II/246. Bibcode:2003yCat.2246....0C.
  6. Pourbaix, D.; et al. (September 2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213.
  7. Tarasov, A. E.; Berdyugina, S. V.; Berdyugin, A. V. (May 1998), "The massive interacting binary KX And: The orbit and physical parameters of the secondary component", Astronomy Letters, 24 (3): 316–320, Bibcode:1998AstL...24..316T
  8. Tezlaff, N.; Neuhäuser, R.; Hohle, N. N. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x
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