Astronomy:KX Andromedae

From HandWiki
Short description: Spectroscopic binary star in the constellation Andromeda
KX Andromedae
250px
Bipolar jets ejected from KX Andromedae, imaged in Hα light[1]
Observation data
Equinox J2000.0]] (ICRS)
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)[2] mas/yr
Dec.: −0.761(17)[2] mas/yr
Parallax (π)1.3172 ± 0.0207[2] mas
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, 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

  1. ↑ 1.0 1.1 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. doi:10.3847/2515-5172/ad9478. Bibcode: 2024RNAAS...8..289Z. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 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.
  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. doi:10.1134/S1063772911010070. Bibcode: 2011ARep...55...31S. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 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.
  6. ↑ Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (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. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246. 
  7. ↑ Pourbaix, D. et al. (September 2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics 424 (2): 727–732. doi:10.1051/0004-6361:20041213. Bibcode: 2004A&A...424..727P. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 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. ↑ 9.0 9.1 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T. 
  10. ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. 
  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. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K. 
  12. ↑ Koubský, P.; Harmanec, P.; Brož, M.; Kotková, L.; Yang, S.; Božić, H.; Sudar, D.; Frémat, Y. et al. (2019). "Properties and nature of be stars". Astronomy & Astrophysics 629: A105. doi:10.1051/0004-6361/201834597. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:KX_Andromedae&oldid=4214232"