Pi Boötis

Star in the constellation Boötes

Pi Boötis  Observation data
Epoch J2000 Equinox J2000

Constellation | Boötes
Right ascension | 14h 40m 43.56087s[1]
Declination | +16° 25′ 05.8863″[1]
Apparent magnitude (V) | 4.5038[1] (4.893 + 5.761)[2]
Characteristics
Spectral type | B9 IIIp (MnHgSi) + A6 V[3]
U−B color index | −0.31[4]
B−V color index | −0.03[4]
R−I color index | −0.02
Astrometry
Radial velocity (Rv)| −1.1±0.8[5] km/s
Proper motion (μ)|  RA: +11.44[1] mas/yr
Dec.: +9.47[1] mas/yr
Parallax (π)| 10.67±1.35 mas[1]
Distance| approx. 310 ly
(approx. 90 pc)
Absolute magnitude (MV)| –0.39[6]
Details[6]
π1 Boo
Mass| 3.49±0.14 M☉
Radius| 3.2±0.4 R☉
Luminosity| 214 L☉
Surface gravity (log g)| 3.99±0.18[7] cgs
Temperature| 12,052±456[7] K
Metallicity [Fe/H]| +0.18±0.17[7] dex
Rotational velocity (v sin i)| 14.0[8] km/s
Other designations
π Boo, 29 Boötis, BD+17° 2768, HIP 71762, ADS 9338[9]
π1 Boötis: HD 129174, HR 5475, SAO 101138
π2 Boötis: HD 129175, HR 5476, SAO 101139
Database references
SIMBAD| data
Database references
SIMBAD| data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Pi Boötis, Latinized from π Boötis, is a probable triple star[10] system in the northern constellation of Boötes. It is visible to the naked eye with a combined apparent visual magnitude of 4.50.[1] Based upon an annual parallax shift of 10.67[1] mas as seen from Earth, it is located roughly 310 light years from the Sun.

The brighter primary, component π1 Boötis, has a visual magnitude of 4.89[2] and a stellar classification of B9 IIIp (MnHgSi),[3] which suggests it is an evolved blue-white hued B-type giant star. It is a chemically peculiar star of the HgMn type,[8] with a spectrum that displays anomalous overabundances of mercury, manganese, and silicon.[3] This component is most likely a single-lined spectroscopic binary with an unknown companion.[10] Its magnitude 5.76[2] visible companion, π2 Boötis, is a white-hued A-type main-sequence star with a class of A6 V.[3] 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%.[10]

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

## References

[edit]

1. ^ a b c d e f g h van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.653-664&rft.date=2007&rft_id=info:arxiv/0708.1752&rft_id=https://api.semanticscholar.org/CorpusID:18759600#id-name=S2CID&rft_id=info:doi/10.1051/0004-6361:20078357&rft_id=info:bibcode/2007A&A...474..653V;&rft.aulast=van+Leeuwen&rft.aufirst=F.&rfr_id=info:sid/en.wikipedia.org:Pi+Boötis" class="Z3988">
2. ^ a b c Høg, E.; et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
3. ^ a b c d 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, Bibcode:1984ApJ...276..266A, doi:10.1086/161610.266-269&rft.date=1984-01-01&rft_id=info:doi/10.1086/161610&rft_id=info:bibcode/1984ApJ...276..266A&rft.aulast=Abt&rft.aufirst=H.+A.&rft.au=Cardona,+O.&rfr_id=info:sid/en.wikipedia.org:Pi+Boötis" class="Z3988">
4. ^ a b 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.1-49&rft.date=1978&rft_id=info:bibcode/1978A&AS...34....1N;&rft.aulast=Nicolet&rft.aufirst=B.&rfr_id=info:sid/en.wikipedia.org:Pi+Boötis" class="Z3988">
5. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.759-771&rft.date=2006-11&rft_id=info:arxiv/1606.08053&rft_id=https://api.semanticscholar.org/CorpusID:119231169#id-name=S2CID&rft_id=info:doi/10.1134/S1063773706110065&rft_id=info:bibcode/2006AstL...32..759G&rft.aulast=Gontcharov&rft.aufirst=G.+A.&rfr_id=info:sid/en.wikipedia.org:Pi+Boötis" class="Z3988">
6. ^ a b North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N.181-187&rft.date=1998-06&rft_id=info:arxiv/astro-ph/9802286&rft_id=info:bibcode/1998A&A...334..181N;&rft.aulast=North&rft.aufirst=P.&rfr_id=info:sid/en.wikipedia.org:Pi+Boötis" class="Z3988">
7. ^ a b c Prugniel, P.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
8. ^ a b 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, Bibcode:2016MNRAS.460.1912G, doi:10.1093/mnras/stw9111912-1922&rft.date=2016-08&rft_id=info:doi/10.1093/mnras/stw911&rft_id=info:bibcode/2016MNRAS.460.1912G&rft.aulast=Ghazaryan&rft.aufirst=S.&rft.au=Alecian,+G.&rfr_id=info:sid/en.wikipedia.org:Pi+Boötis" class="Z3988">
9. ^ "pi Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-10-18.
10. ^ a b c Schöller, M.; et al. (November 2010), "Multiplicity of late-type B stars with HgMn peculiarity", Astronomy and Astrophysics, 522: 12, arXiv:1010.3643, Bibcode:2010A&A...522A..85S, doi:10.1051/0004-6361/201014246, S2CID 119273467, A85

## External links

[edit]

* Kaler, James B. (April 22, 2011), "Pi Bootis", Stars, University of Illinois, retrieved 2017-10-13.
* HR 5475
* CCDM J14407+1625
* Image Pi Boötis

* v
* t
* e

Constellation of Boötes

* Boötes in Chinese astronomy
* Boötes Void
* List of stars in Boötes

Stars|

| Bayer|

* α (Arcturus)
* β (Nekkar)
* γ (Seginus)
* δ (Princeps)
* ε (Izar)
* ζ
* η (Muphrid)
* θ (Asellus Primus)
* ι (Asellus Secundus)
* κ (Asellus Tertius)
* λ (Xuange)
* μ (Alkalurops)
* ν1
* ν2
* ξ
* ο
* π
* ρ
* σ
* τ
* υ
* φ
* χ
* ψ
* ω

|

Flamsteed|

* 1
* 2
* 3
* 6 (e)
* 7
* 9
* 10
* 11
* 12 (d)
* 13
* 14
* 15
* 18
* 20
* 22 (f)
* 24 (g)
* 26
* 31
* 32
* 33
* 34
* 38 (h, Merga)
* 39
* 40
* 44 (i, Quadrans)
* 45 (c)
* 46 (b)
* 47 (k)
* 50

Variable|

* R
* S
* T
* ZZ
* BL
* BP
* BX
* BY
* CE
* CH
* CI
* CN
* CP
* CR
* CX
* CY (101 Vir)
* DE
* EK
* HN
* HP

HD|

* 118508
* 118889
* 122563
* 125040
* 125351 (A)
* 125658
* 126128
* 126141
* 126200
* 126271
* 127304
* 127334
* 127726
* 128093
* 128198
* 129132
* 129357
* 130084
* 130603
* 130917
* 131040
* 131473
* 131496 (Arcalís)
* 132029
* 132406
* 132563
* 134064
* 134335
* 135438
* 135530
* 135944
* 136418 (Nikawiy)
* 141399

Other|

* CFBDSIR 1458+10
* Gliese 526
* HAT-P-4
* 2MASS J15031961+2525196
* LHS 2924
* PSR J1544+4937
* SDSS J1416+1348
* SDSS J1433+1011
* TVLM 513-46546
* WASP-14
* ZTF J153932.16+502738.8

| Exoplanets|

* HD 136418 b (Awasis)
* HAT-P-4b
* HD 128311 b
* c
* HD 132406 b
* τ Boötis b
* WASP-14b

|

| Star clusters|

* NGC 5466

|

Galaxies|

| NGC|

* 5008
* 5248
* 5251
* 5490
* 5500
* 5508
* 5514
* 5523
* 5529
* 5533
* 5535
* 5539
* 5544
* 5545
* 5548
* 5557
* 5559
* 5562
* 5579
* 5582
* 5601
* 5609
* 5613
* 5614
* 5615
* 5624
* 5630
* 5641
* 5653
* 5665
* 5676
* 5682
* 5683
* 5714
* 5752
* 5753
* 5754
* 5755
* 5790
* 5820
* 5821
* 5829
* 5837
* 5886
* 5896
* 5929
* 5930
* 5966

|

Numbered|

* I
* II
* III

Other|

* Arp 302
* 3C 295
* 3C 299
* 3C 303
* CEERS-2112
* CEERS-93316
* CLASS B1359+154
* Cloverleaf quasar
* DDO 190
* EGS-zs8-1
* EGSY8p7
* H1426+428
* IC 4461
* IC 4462
* IC 4481
* IC 4516
* IRAS 13349+2438
* LEDA 2108986
* MACS 1423-z7p64
* Maisie's Galaxy
* Markarian 463
* MS 1512-cB58
* OQ 172
* PG 1543+489
* PGC 1470080
* PKS 1345+125
* SDSS J135646.10+102609.0
* SDSS J1430+2303
* Teacup galaxy
* UGC 9128
* UGC 9425
* UGC 9684
* UGC 9796
* ULAS J1342+0928

| Galaxy clusters|

* Abell 1795
* IDCS J1426.5+3508

|

| Astronomical events|

* GRB 990123
* GRB 080319B
* SCP 06F6
* SN 2003fg
* SN 2005bc
* SN 2020tlf

|

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template