astro.wikisort.org - Star

Search / Calendar

Kappa Coronae Borealis, Latinized from κ Coronae Borealis, is the star approximately 98 light years away in the constellation of Corona Borealis. The apparent magnitude is +4.82 (4.17 trillion times fainter than the Sun) and the absolute magnitude is +2.35 (9.82 times brighter than the Sun). It is an orange K-type subgiant star of spectral type K1IV, meaning it has almost completely exhausted its hydrogen supply in its core. It is 1.32 times as massive as the Sun yet has brightened to 11.6 times its luminosity. Around 2.5 billion years old, it was formerly an A-type main sequence star.[6]

κ Coronae Borealis
Location of κ Coronae Borealis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corona Borealis
Right ascension 15h 51m 13.9315s[1]
Declination +35° 39′ 26.5647″[1]
Apparent magnitude (V) +4.79[2]
Characteristics
Spectral type K0 III-IV[2]
Astrometry
Proper motion (μ) RA: −8.792±0.177[1] mas/yr
Dec.: −347.766±0.202[1] mas/yr
Parallax (π)33.2328 ± 0.1083 mas[1]
Distance98.1 ± 0.3 ly
(30.09 ± 0.10 pc)
Absolute magnitude (MV)+2.37[3]
Details[4]
Mass1.32±0.10 M☉
Radius4.77±0.07 R☉
Luminosity11.6±0.3 L☉
Surface gravity (log g)3.15±0.14 cgs
Temperature4,870±47 K
Metallicity [Fe/H]+0.13±0.03 dex
Other designations
κ CrB, 11 CrB, HD 142091, HIP 77655, HR 5901, SAO 64948[5]
Database references
SIMBADdata

Dust disk


In March 2013, it was announced that resolved images of at least one dust disk surrounding Kappa Coronae Borealis were captured, making it the first subgiant to host such circumstellar belt.[6] The disk extends out to 120 AU.[7]


Planetary system


In October 2007, a giant planet was found by Johnson et al., who used the radial velocity method.[8] In 2012 it was confirmed.[2]

This planet was assumed to be outside the habitable zone on the assumption that the star is K1IVa.[9] Given the star's luminosity, the planet is more likely on the zone's inner edge.[10]

The width of the circumstellar belt suggests the presence of a second planetary companion of the star, either within it or between two narrower belts.[6]

The Kappa Coronae Borealis planetary system[11]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥1.811±0.057 MJ 2.65±0.13 1285±14 0.167±0.032 — —

See also



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. Sato, Bun'ei; et al. (2012). "Substellar Companions to Seven Evolved Intermediate-Mass Stars". Publications of the Astronomical Society of Japan. 64 (6). 135. arXiv:1207.3141. Bibcode:2012PASJ...64..135S. doi:10.1093/pasj/64.6.135.
  3. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  4. White, T. R.; et al. (July 2018). "Interferometric diameters of five evolved intermediate-mass planet-hosting stars measured with PAVO at the CHARA Array". Monthly Notices of the Royal Astronomical Society. 477 (4): 4403–4413. arXiv:1804.05976. Bibcode:2018MNRAS.477.4403W. doi:10.1093/mnras/sty898. S2CID 48365395.
  5. "Kappa Coronae Borealis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-21.
  6. Bonsor, Amy; et al. (2013). "Spatially resolved images of dust belt(s) around the planet-hosting subgiant κ CrB". MNRAS. 431 (4): 3025–3035. arXiv:1302.7000. Bibcode:2013MNRAS.431.3025B. doi:10.1093/mnras/stt367. S2CID 27703182.
  7. Pawellek, Nicole; Krivov, Alexander V.; Marshall, Jonathan P.; Montesinos, Benjamin; Ábrahám, Péter; Moór, Attila; Bryden, Geoffrey; Eiroa, Carlos (2014). "Disk Radii and Grain Sizes in Herschel-resolved Debris Disks". The Astrophysical Journal. 792 (1): 19. arXiv:1407.4579. Bibcode:2014ApJ...792...65P. doi:10.1088/0004-637X/792/1/65. S2CID 119282523. 65.
  8. Johnson, John Asher; et al. (2008). "Retired A Stars and Their Companions. II. Jovian Planets Orbiting κ CrB and HD 167042". The Astrophysical Journal. 675 (1): 784–789. arXiv:0711.4367. Bibcode:2008ApJ...675..784J. doi:10.1086/526453.
  9. "Planet kappa CrB b". Archived from the original on 2013-02-11.
  10. An earth-analogue should be slightly more than 3 AU away: square root of luminosity 12.9.
  11. Luhn, Jacob K.; et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal. 157 (4). 149. arXiv:1811.03043. Bibcode:2019AJ....157..149L. doi:10.3847/1538-3881/aaf5d0. S2CID 102486961.


На других языках

[de] Kappa Coronae Borealis

κ Coronae Borealis (Kappa Coronae Borealis, κ CrB) ist ein Stern im Sternbild Corona Borealis. Er besitzt eine scheinbare Helligkeit von 4,79 mag. Im Jahre 2007 entdeckte John Asher Johnson einen extrasolaren Planeten, der diesen Stern umkreist: Kappa Coronae Borealis b.
- [en] Kappa Coronae Borealis

[es] Kappa Coronae Borealis

Kappa Coronae Borealis (κ CrB / 11 Coronae Borealis / HD 142091) es una estrella en la constelación de Corona Boreal de magnitud aparente +4,82. En 2007 se anunció el descubrimiento de un planeta extrasolar en torno a esta estrella.

[ru] Каппа Северной Короны

Каппа Северной Короны (лат. κ Coronae Borealis, HD 142091) — звезда в созвездии Северная Корона, находящаяся на расстоянии 31,12 парсека или 101,51 светового года от Солнца с видимой звёздной величиной +4.82. Это оранжевый субгигант К-типа с температурой около 4825 кельвинов, светимость мощнее солнечной почти в 4 раза. Звезда массивнее Солнца в 1.8 раза, радиус в 2.8 раза превышает радиус Солнца. Звезда удаляется от солнечной системы со скоростью 24 км/с.


Текст в блоке "Читать" взят с сайта "Википедия" и доступен по лицензии Creative Commons Attribution-ShareAlike; в отдельных случаях могут действовать дополнительные условия.

Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.

2019-2025
WikiSort.org - проект по пересортировке и дополнению контента Википедии