| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14 40 43.56087 |
| Declination | +16° 25′ 05.8863″ |
| Apparent magnitude (V) | 4.5038 (4.893 + 5.761) |
| Characteristics | |
| Spectral type | B9 IIIp (MnHgSi) + A6 V |
| U−B color index | −0.31 |
| B−V color index | −0.03 |
| R−I color index | −0.02 |
| Astrometry | |
| Radial velocity (Rv) | −1.1±0.8 km/s |
| Proper motion (μ) | RA: +11.44 mas/yr Dec.: +9.47 mas/yr |
| Parallax (π) | 10.67 ± 1.35 mas |
| Distance | approx. 310 ly (approx. 90 pc) |
| Absolute magnitude (MV) | –0.39 |
| Details | |
| π Boo | |
| Mass | 3.49±0.14 M☉ |
| Radius | 3.2±0.4 R☉ |
| Luminosity | 214 L☉ |
| Surface gravity (log g) | 3.99±0.18 cgs |
| Temperature | 12,052±456 K |
| Metallicity | +0.18±0.17 dex |
| Rotational velocity (v sin i) | 14.0 km/s |
| Other designations | |
| π Boo, 29 Boötis, BD+17° 2768, HIP 71762, ADS 9338 | |
| π Boötis: HD 129174, HR 5475, SAO 101138 | |
| π 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 system in the northern constellation of Boötes. It is visible to the naked eye with a combined apparent visual magnitude of 4.50. Based upon an annual parallax shift of 10.67 mas as seen from Earth, it is located roughly 310 light years from the Sun.
The brighter primary, component π Boötis, has a visual magnitude of 4.89 and a stellar classification of B9 IIIp (MnHgSi), which suggests it is an evolved blue-white hued B-type giant star. It is a chemically peculiar star of the HgMn type, with a spectrum that displays anomalous overabundances of mercury, manganese, and silicon. This component is most likely a single-lined spectroscopic binary with an unknown companion. Its magnitude 5.76 visible companion, π Boötis, is a white-hued A-type main-sequence star with a class of A6 V. 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%.
Pi Boötis has the Chinese traditional star name 左攝提二 (Zuǒ shè tí èr)
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- 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.
- ^ 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.
- ^ 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.
- ^ 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/stw911
- "pi Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-10-18.
- ^ 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
- Kaler, James B. (April 22, 2011), "Pi Bootis", Stars, University of Illinois, retrieved 2017-10-13.
- HR 5475
- CCDM J14407+1625
- Image Pi Boötis
