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KX Andromedae

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KX Andromedae

Bipolar jets ejected from KX Andromedae, imaged in Hα light[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 07m 06.21216s[2]
Declination +50° 11′ 32.4886″[2]
Apparent magnitude (V) 6.88 – 7.28 variable[3]
Characteristics
Spectral type B3pe+K1III[4]
Apparent magnitude (U) 6.79[5]
Apparent magnitude (B) 7.25[5]
Apparent magnitude (V) 6.92[5]
Apparent magnitude (G) 6.852[2]
Apparent magnitude (J) 5.845[6]
Apparent magnitude (H) 5.33[5]
Apparent magnitude (K) 5.19[5]
Variable type Be star
Astrometry
Radial velocity (Rv)−7.8±0.9[7] km/s
Proper motion (μ) RA: +1.625(19) mas/yr[2]
Dec.: −0.761(17) mas/yr[2]
Parallax (π)1.3172±0.0207 mas[2]
Distance2,480 ± 40 ly
(760 ± 10 pc)
Orbit[8]
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[9] M☉
Age22.4±3.1[9] Myr
Secondary
Radius19±4[8] R☉
Surface gravity (log g)2.0±0.5[8] cgs
Temperature5000±400[8] K
Rotational velocity (v sin i)25±5[8] km/s
Other designations
KX And, AAVSO 2302+49, BD+49 4045, HD 218393, HIP 114154, SAO 52701, TYC 3631-1533-1, 2MASS J23070621+5011324
Database references
SIMBADdata

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.[3] It is at a distance of 2,480 light-years (760 parsecs).[2]

A light curve for KX Andromedae, plotted from Hipparcos data,[10] folded with the period published by Koen and Eyer (2002)[11]

The primary component of the KX Andromedae system is a Be star with a spectral classification B3pe as of 2017,[3] although in historical records it has varied from B1 to B7.[12]

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, transferring mass to the primary star.[8]

The system is only about 25 million years old. The pair complete a circular orbit every 38.919 days at an inclination of 50°.[8]

KX Andromedae is surrounded by bipolar jets of ejected material, that extend 19 light-years (5.8 parsecs) out from it in each direction (angular size 20′). These faint jets, visible in hydrogen-alpha, were discovered in 2024 by astronomer Stefan Ziegenbalg.[1]

References

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  1. ^ a b Ziegenbalg, Stefan (November 2024). "Detection of 19 lt-yr Long Bipolar Jets from Interacting Binary KX And". Research Notes of the AAS. 8 (11): 289. Bibcode:2024RNAAS...8..289Z. doi:10.3847/2515-5172/ad9478.
  2. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c 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.
  4. ^ 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.
  5. ^ a b c d e 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.
  6. ^ 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.
  7. ^ 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.{{cite journal}}: CS1 maint: postscript (link)
  8. ^ a b c d e f g 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.
  9. ^ a b 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.
  10. ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  11. ^ 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. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.
  12. ^ 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.
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