KX Andromedae

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KX Andromedae
KXAndLightCurve.png
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]
Distance 2,620 ± 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
Mass 9.0±0.1 [10]   M☉
Age 22.4±3.1 [10]   Myr
Secondary
Radius 19±4 [9]   R☉
Surface gravity (log g)2.0±0.5 [9]   cgs
Temperature 5000±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
SIMBAD data

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]

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]

Related Research Articles

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QV Andromedae is an Alpha2 Canum Venaticorum variable in the constellation Andromeda. Its maximum apparent visual magnitude is 6.6, so it can be seen by the naked eye under very favourable conditions. The brightness varies slightly following a periodic cycle of approximately 5.23 days.

<span class="mw-page-title-main">LQ Andromedae</span> Star in the constellation Andromeda

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<span class="mw-page-title-main">AC Andromedae</span> Variable star in the constellation Andromeda

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<span class="mw-page-title-main">AD Andromedae</span> Eclipsing binary star in the constellation Andromeda

AD Andromedae is an eclipsing binary in the constellation Andromeda. Its maximum apparent visual magnitude is 11.2, but it shows a decrease of 0.62 magnitudes during the main eclipse and 0.58 during the secondary one. It is classified as a Beta Lyrae variable star with a period of almost one day.

<span class="mw-page-title-main">BX Andromedae</span> Star in the constellation Andromeda

BX Andromedae is an eclipsing binary star in the constellation Andromeda. Its maximum apparent visual magnitude is 8.87. Within a cycle of approximately 14.6 hours, the brightness drops down to a magnitude of 9.53 during the main eclipse, and to a magnitude of 9.12 during the secondary one. It is classified as a Beta Lyrae variable.

<span class="mw-page-title-main">CC Andromedae</span> Star in the constellation Andromeda

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<span class="mw-page-title-main">CN Andromedae</span> Star in the constellation Andromeda

CN Andromedae is an eclipsing binary star in the constellation Andromeda. Its maximum apparent visual magnitude is 9.62 and drops down to a minimum of 10.2 during the main eclipse. It is classified as a Beta Lyrae variable with a period roughly of 0.4628 days.

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<span class="mw-page-title-main">HN Andromedae</span> Star in the constellation Andromeda

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<span class="mw-page-title-main">KZ Andromedae</span> Star in the constellation Andromeda

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<span class="mw-page-title-main">QR Andromedae</span> Eclipsing binary star in the constellation Andromeda

QR Andromedae is an eclipsing binary star in the constellation Andromeda. Its maximum apparent visual magnitude is 12.16, but its light curve shows clearly eclipsing events where its brightness can drop to a magnitude of 13.07. This leads to its classification as an Algol variable star.

<span class="mw-page-title-main">QX Andromedae</span> Eclipsing binary star system in the constellation Andromeda

QX Andromedae is an eclipsing binary in the constellation Andromeda. It varies from a maximum apparent visual magnitude of 11.28 to a minimum of 11.50. Since it is impossible to specify the onset time of the eclipses, it is classified as a W Ursae Majoris variable star. It is also observed as an X-ray source and is a member of the open cluster NGC 752.

<span class="mw-page-title-main">V455 Andromedae</span> Dwarf nova star in the constellation Andromeda

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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. arXiv: astro-ph/0112194 . Bibcode:2002MNRAS.331...45K. doi: 10.1046/j.1365-8711.2002.05150.x .
  3. 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.
  4. 1 2 3 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. 1 2 3 4 5 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. 1 2 3 4 5 6 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
  10. 1 2 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
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