Astronomy:Pi Boötis

From HandWiki
Short description: Star in the constellation Boötes
Pi Boötis
Location of π Boötis (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Boötes[1]
Right ascension  14h 40m 43.559s[2]
Declination +16° 25′ 05.98″[2]
Apparent magnitude (V) 4.49[1] (4.893 + 5.761)[3]
Characteristics
Spectral type B9 IIIp (MnHgSi) + A6 V[4]
U−B color index −0.31[5]
B−V color index −0.002±0.010[1]
R−I color index −0.02[citation needed]
Astrometry
Radial velocity (Rv)−1.1±0.8[6] km/s
Proper motion (μ) RA: +13.922[2] mas/yr
Dec.: +15.566[2] mas/yr
Parallax (π)10.3357 ± 0.1199[2] mas
Distance316 ± 4 ly
(97 ± 1 pc)
Absolute magnitude (MV)–0.39[7]
Details
π1 Boo
Mass3.49±0.14[7] M☉
Radius3.2±0.4[7] R☉
Luminosity214[7] L☉
Surface gravity (log g)3.99±0.18[8] cgs
Temperature12,052±456[8] K
Metallicity [Fe/H]+0.18±0.17[8] dex
Rotational velocity (v sin i)14.0[9] km/s
π2 Boo
Surface gravity (log g)3.60±0.01[10] cgs
Temperature7504+21−17[10] K
Rotational velocity (v sin i)144[11] km/s
Other designations
π Boo, 29 Boötis, BD+17°2768, HIP 71762, ADS 9338[12]
π1 Boötis: HD 129174, HR 5475, SAO 101138
π2 Boötis: HD 129175, HR 5476, SAO 101139
Database references
SIMBADπ1 Boo
π2 Boo

Pi Boötis is a candidate triple star[13] system in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from π Boötis, and abbreviated Pi Boo or π Boo. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of 4.50.[14] Based upon an annual parallax shift of 10.67 mas[2] as seen from Earth, it is located roughly 316 light years from the Sun.

The brighter primary, component π1 Boötis, has a visual magnitude of 4.89[3] and a stellar classification of B9 IIIp (MnHgSi),[4] which suggests it is an evolved blue-white hued B-type giant star. It is a chemically peculiar star of the HgMn type,[9] with a spectrum that displays anomalous overabundances of mercury, manganese, and silicon.[4] This component is most likely a single-lined spectroscopic binary with an unknown companion.[13]

Its magnitude 5.76[3] visible companion, π2 Boötis, is a white-hued A-type main-sequence star with a class of A6 V.[4] It is spinning rapidly with a projected rotational velocity of 144 km/s.[11] As of 2010, the pair were separated by 5.537±0.003 arcseconds on the sky along a position angle of 110.5°±0.5°. This corresponds to a projected separation of 538.6±47.7 AU. The odds that is a mere chance alignment is 0.85%.[13]

Pi Boötis has the Chinese traditional star name 左攝提二 (Zuǒ shè tí èr).

References

  1. ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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 Høg, E. et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics 355: L27, doi:10.1888/0333750888/2862, Bibcode: 2000A&A...355L..27H. 
  4. ↑ 4.0 4.1 4.2 4.3 Abt, H. A.; Cardona, O. (January 1, 1984), "The nature of the visual companions of Ap and Am stars", Astrophysical Journal, Part 1 276: 266–269, doi:10.1086/161610, Bibcode: 1984ApJ...276..266A. 
  5. ↑ Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode: 1978A&AS...34....1N. 
  6. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 7.2 7.3 North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics 334: 181–187, Bibcode: 1998A&A...334..181N. 
  8. ↑ 8.0 8.1 8.2 Prugniel, P. et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics 531: A165, doi:10.1051/0004-6361/201116769, Bibcode: 2011A&A...531A.165P. 
  9. ↑ 9.0 9.1 Ghazaryan, S.; Alecian, G. (August 2016), "Statistical analysis from recent abundance determinations in HgMn stars", Monthly Notices of the Royal Astronomical Society 460 (2): 1912–1922, doi:10.1093/mnras/stw911, Bibcode: 2016MNRAS.460.1912G 
  10. ↑ 10.0 10.1 Royer, P. (January 2024), "MELCHIORS. The Mercator Library of High Resolution Stellar Spectroscopy", Astronomy & Astrophysics 681: id. A107, doi:10.1051/0004-6361/202346847, Bibcode: 2024A&A...681A.107R. 
  11. ↑ 11.0 11.1 Royer, F. et al. (May 2002), "Rotational velocities of A-type stars II. Measurement of vsini in the northern hemisphere", Astronomy & Astrophysics 393: 897–912, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R. 
  12. ↑ "pi Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=pi+Boo. 
  13. ↑ 13.0 13.1 13.2 Schöller, M. et al. (November 2010), "Multiplicity of late-type B stars with HgMn peculiarity", Astronomy and Astrophysics 522: 12, doi:10.1051/0004-6361/201014246, A85, Bibcode: 2010A&A...522A..85S 
  14. ↑ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Pi_Boötis&oldid=4215547"