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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.[4]

KX Andromedae

A light curve for KX Andromedae, plotted from Hipparcos data,[1] folded with the period published by Koen and Eyer (2002)[2]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 07m 06.2120s[3]
Declination +50° 11′ 32.4891″[3]
Apparent magnitude (V) 6.88 – 7.28 variable[4]
Characteristics
Spectral type B3pe+K1III[5]
Apparent magnitude (U) 6.79[6]
Apparent magnitude (B) 7.25[6]
Apparent magnitude (V) 6.92[6]
Apparent magnitude (G) 6.8227[3]
Apparent magnitude (J) 5.845[7]
Apparent magnitude (H) 5.33[6]
Apparent magnitude (K) 5.19[6]
Variable type Be star
Astrometry
Radial velocity (Rv)−7.8±0.9[8] km/s
Proper motion (μ) RA: 1.697±0.057 [3] mas/yr
Dec.: −0.788±0.048[3] mas/yr
Parallax (π)1.2444 ± 0.0328 mas[3]
Distance2,620 ± 70 ly
(800 ± 20 pc)
Orbit[9]
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[10] M☉
Age22.4±3.1[10] Myr
Secondary
Radius19±4[9] R☉
Surface gravity (log g)2.0±0.5[9] cgs
Temperature5000±400[9] K
Rotational velocity (v sin i)25±5[9] 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 as in 2017,[4] although on historical record it has varied from B1 to B7.[11]

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.[9]

The system is only about 25 million years old. The pair complete a circular orbit every 38.919 days at an inclination of 50°.[9]


References


  1. "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  2. Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.
  3. 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.
  4. 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.
  5. 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. S2CID 122700080.
  6. 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.
  7. 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.
  8. 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, S2CID 119387088.
  9. 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
  10. 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, S2CID 118629873
  11. Koubský, P.; Harmanec, P.; Brož, M.; Kotková, L.; Yang, S.; Božić, H.; Sudar, D.; Frémat, Y.; Korčáková, D.; Votruba, V.; Škoda, P.; Šlechta, M.; Ruždjak, D. (2019), "Properties and nature of be stars", Astronomy & Astrophysics, 629: A105, arXiv:1908.02719, doi:10.1051/0004-6361/201834597, S2CID 199472856

На других языках

- [en] KX Andromedae

[ru] KX Андромеды

KX Андромеды (лат. KX Andromedae), HD 218393 — двойная звезда[5][6][7][8] в созвездии Андромеды на расстоянии приблизительно 2620 световых лет (около 804 парсеков) от Солнца. Видимая звёздная величина звезды — от +7,28 до +6,88m[9]. Орбитальный период — около 38,919 суток[10]. Возраст звезды оценивается как около 22,4 млн лет[11].


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