Astronomy:Rho Boötis

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Short description: Star in the constellation Boötes
Not to be confused with R Boötis.
ρ Boötis
Diagram showing star positions and boundaries of the Boötes constellation and its surroundings
12px
Location of ρ Boötes (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Boötes
Right ascension  14h 31m 49.789s[1]
Declination +30° 22′ 17.17″[1]
Apparent magnitude (V) 3.59[2]
Characteristics
Spectral type K4 III[3]
U−B color index +1.44[2]
B−V color index +1.30[2]
R−I color index 0.65[citation needed]
Variable type RS CVn.[4]
Astrometry
Radial velocity (Rv)−13.57±0.19[5] km/s
Proper motion (μ) RA: –100.531[1] mas/yr
Dec.: +119.870[1] mas/yr
Parallax (π)19.8550 ± 0.1587[1] mas
Distance164 ± 1 ly
(50.4 ± 0.4 pc)
Absolute magnitude (MV)+0.27[3]
Details[6]
Mass1.29±0.12 M☉
Radius20.58±0.19 R☉
Luminosity128.9±6.8 L☉
Surface gravity (log g)1.85±0.05[7] cgs
Temperature4,285±54 K
Metallicity [Fe/H]−0.19±0.10[7] dex
Rotational velocity (v sin i)5.0[8] km/s
Age4.31±1.17 Gyr
Other designations
Kalasungsang, ρ Boo, 25 Boötis, BD+31°2628, FK5 534, GC 19597, HD 127665, HIP 71053, HR 5429, SAO 64202, PPM 77975, WDS J14318+3022A[9]
Database references
SIMBADdata

Rho Boötis, Latinised from ρ Boötis and formally named Kalasungsang,[10] is a single,[11] orange-hued star in the northern constellation of Boötes. This star is visible to the naked eye with an apparent visual magnitude of 3.59.[2] Based upon parallax measurements, it is located at a distance of approximately 164 light-years (50 parsecs) from Earth. It is moving closer to the Sun with a radial velocity of −13.6 km/s.[5] There is an optical companion, a magnitude 11.5 star, located 34.7 arcseconds away along a position angle of 345° (as of 2013).[12]

Nomenclature

ρ Boötis in optical light

Rho Boötis is a Bayer designation that is Latinised from ρ Boötis, and abbreviated Rho Boo or ρ Boo. It is known by several other catalog designations, including 25 Boötis, BD+31°2628, FK5 534, HD 127665, HIP 71053, HR 5429, and SAO 64202.[9] In Chinese astronomy, 梗河 (Gěng Hé), meaning Celestial Lance, refers to an asterism consisting of ρ Boötis, ε Boötis and σ Boötis.[13] Consequently, the Chinese name for ρ Boötis itself is 梗河三 (Gěng Hé sān, English: the Third Star of Celestial Lance).[14]

The IAU Working Group on Star Names approved the name Kalasungsang for ρ Boötis on 15 April 2026.[10] Kala Sungsang, the upside-down demon, is a constellation from Bali (Indonesia), corresponding to Boötes. The term is derived from Sanskrit काल kālá meaning death or time.[15]

Properties

A light curve for Rho Boötis, plotted from Hipparcos data[16]

This is an evolved K-type giant star, currently on the red-giant branch, with a stellar classification of K4 III[3] and an estimated age of 4[6] billion years. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[17] With around 1.23 times the mass of the Sun, it has expanded to 20.6 times the Sun's girth. The star is radiating 129 times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 4,285 K.[6] Rho Boötis is classified as a RS Canum Venaticorum variable.[4] Koen and Eyer examined the Hipparcos data for this star, and found that it varied with a period of 5.214 days, and an amplitude of 0.0027 magnitudes.[18]

References

  1. ↑ 1.0 1.1 1.2 1.3 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.
  2. ↑ 2.0 2.1 2.2 2.3 Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society 172 (3): 667–679, doi:10.1093/mnras/172.3.667, Bibcode: 1975MNRAS.172..667J. 
  3. ↑ 3.0 3.1 3.2 Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics 430: 303–311, doi:10.1051/0004-6361:20041440, Bibcode: 2005A&A...430..303C. 
  4. ↑ 4.0 4.1 NSV 6697, AAVSO, https://www.aavso.org/vsx/index.php?view=detail.top&oid=45321, retrieved 15 October 2022. 
  5. ↑ 5.0 5.1 Massarotti, Alessandro et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M. 
  6. ↑ 6.0 6.1 6.2 Baines, Ellyn K. et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 155 (1): 30, doi:10.3847/1538-3881/aa9d8b, Bibcode: 2018AJ....155...30B .
  7. ↑ 7.0 7.1 Reffert, Sabine et al. (2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity", Astronomy & Astrophysics 574: A116, doi:10.1051/0004-6361/201322360, Bibcode: 2015A&A...574A.116R. 
  8. ↑ Massarotti, Alessandro et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M. 
  9. ↑ 9.0 9.1 "rho Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=rho+Boo. 
  10. ↑ 10.0 10.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  12. ↑ Mason, Brian D. et al. (2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M. 
  13. ↑ 陳久金 (2005) (in zh), 台灣書房出版有限公司, ISBN 978-986-7332-25-7. 
  14. ↑ (in zh), AEEA Astronomy Education Information Network, June 29, 2006, http://aeea.nmns.edu.tw/2006/0606/ap060629.html, retrieved August 9, 2021. 
  15. ↑ Azkarrula, Youla; Hoffmann, Susanne M. "Kala Sungsang, Kalasungsang". IAU Working Group on Star Names. https://ase.exopla.net/index.php/Kala_Sungsang. 
  16. ↑ HIP CDROM catalogues, Strasbourg astronomical Data Center, https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats, retrieved 15 October 2022. 
  17. ↑ Garrison, R. F. (December 1993), "Anchor Points for the MK System of Spectral Classification", Bulletin of the American Astronomical Society 25: 1319, Bibcode: 1993AAS...183.1710G, http://www.astro.utoronto.ca/~garrison/mkstds.html, retrieved February 4, 2012. 
  18. ↑ 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. 



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