BP Boötis

Short description: Star in the constellation Boötes

BP Boötis

Location of BP Boötis (circled)

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Boötes
Right ascension |  15h 42m 50.760818s[1]
Declination | +52° 21′ 39.24441″[1]
Apparent magnitude (V) | 5.48[2]
Characteristics
Spectral type | A0 Vp Si Cr[3]
B−V color index | −0.042±0.004[2]
Variable type | α2 CVn[4]
Astrometry
Radial velocity (Rv)| −16.1±2.8[2] km/s
Proper motion (μ)|  RA: −66.214[1] mas/yr
Dec.: +29.308[1] mas/yr
Parallax (π)| 10.92 ± 0.18[1] mas
Distance| 299 ± 5 ly
(92 ± 2 pc)
Absolute magnitude (MV)| +0.48[5]
Details[5]
Mass| 2.58±0.07 M☉
Radius| 2.7±0.2 R☉
Luminosity| 65 L☉
Surface gravity (log g)| 3.99±0.07 cgs
Temperature| 9,954 K
Rotation| 1.29557 days
Rotational velocity (v sin i)| 69[6] km/s
Age| 170[6] Myr
Other designations

BP Boo, BD+52°1898, FK5 3247, GC 21154, HD 140728, HIP 76957, HR 5857, SAO 29628[7]

Database references
SIMBAD| data
Light curve for BP Boötis, plotted from TESSdata[8]

BP Boötis is a solitary[9] variable star in the northern constellation of Boötes, near the northern constellation border with Draco. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude that fluctuates around 5.48.[2] The star is located 299 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −16 km/s.[2]

The star, often called HD 140728 before it was known to be variable, was transferred from Boötes to Quadrans Muralis. Later, when the International Astronomical Union officially recognised constellations, Quadrans Muralis became obsolete, so this star was moved back to Boötes.[10] In 1962, William Wehlau announced that the star's brightness varied, based on observations made from 1958 through 1960.[11]

This is an Ap star with a stellar classification of A0 Vp Si Cr,[3] showing abundance anomalies of silicon and chromium. It is an Alpha2 Canum Venaticorum variable that varies in brightness by 0.02 magnitude over a period of 1.3 days.[4][12] The distribution of silicon across the surface appears to be associated with the magnetic field of the star, with depleted regions appearing around the magnetic poles.[13]

BP Boötis is 170[6] million years old with a projected rotational velocity of 69 km/s,[6] having a rotation period of 1.29557 days. It has 2.6 times the mass of the Sun and 2.7 times the Sun's radius. The star is radiating 65 times the luminosity of the Sun from its photosphere at an effective temperature of 9,954 K.[5]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
2. ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
3. ↑ 3.0 3.1 Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement Series 99: 135, doi:10.1086/192182, Bibcode: 1995ApJS...99..135A
4. ↑ 4.0 4.1 Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
5. ↑ 5.0 5.1 5.2 North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics 334: 181–187, Bibcode: 1998A&A...334..181N.
6. ↑ 6.0 6.1 6.2 6.3 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
7. ↑ "BP Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BP+Boo.
8. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
9. ↑ 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.
10. ↑ Barentine, John C. (2016). The Lost Constellations: A History of Obsolete, Extinct, or Forgotten Star Lore. Springer. pp. 304. ISBN 978-3-319-22794-8. https://books.google.com/books?id=u_7NCgAAQBAJ&dq=BP+Boötis&pg=PA487.
11. ↑ Wehlau, William (August 1962). "Photometry of γ Equulei and HD 140728". Publications of the Astronomical Society of the Pacific 74 (439): 286–290. doi:10.1086/127810. Bibcode: 1962PASP...74..286W. https://articles.adsabs.harvard.edu/pdf/1962PASP...74..286W. Retrieved 2 December 2024.
12. ↑ Watson, Christopher (January 4, 2010), "BP Boötis", AAVSO Website (American Association of Variable Star Observers), http://www.aavso.org/vsx/index.php?view=detail.top&oid=4396, retrieved 3 August 2014.
13. ↑ Hatzes, Artie P. (July 1990), "The distribution of silicon on BP Boo", Monthly Notices of the Royal Astronomical Society 245: 56, doi:10.1093/mnras/245.1.56, Bibcode: 1990MNRAS.245...56H.

* v
* t
* e

Boötes constellation

Stars (list)|

| 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)
* 45 (c)
* 46 (b)
* 47 (k)
* 50
* 101 Vir

Variable|

* R
* S
* T
* V
* RS
* RV
* RX
* SS
* ST
* SW
* TU
* TY
* TZ
* UU
* UY
* UZ
* VW
* XY
* YZ
* ZZ
* AC
* AD
* AR
* BL
* BP
* BX
* BY
* CH
* CI
* CK
* CN
* CP
* CR
* DE
* EF
* EK
* GU
* HN
* HP

HR|

* 5123
* 5129
* 5137
* 5138
* 5156
* 5164
* 5220
* 5243
* 5254
* 5262
* 5270
* 5273
* 5274
* 5310
* 5335
* 5333
* 5346
* 5347
* 5360
* 5361 (A)
* 5363
* 5372
* 5373
* 5374
* 5385
* 5387
* 5388
* 5394
* 5402
* 5416
* 5422
* 5423
* 5433
* 5445
* 5448
* 5454
* 5462
* 5464
* 5467
* 5472
* 5473
* 5483
* 5493
* 5507
* 5510
* 5524
* 5529
* 5532
* 5537
* 5541
* 5550
* 5567
* 5569
* 5574
* 5575
* 5581
* 5592
* 5609
* 5630
* 5633
* 5635
* 5639
* 5640
* 5648
* 5673
* 5674
* 5677
* 5715
* 5716
* 5726
* 5741
* 5752
* 5830
* 5835

HD|

* 119784
* 122443
* 124678
* 125076
* 126307
* 129357
* 131496 (Arcalís)
* 132406
* 132563
* 135944
* 136418

Gliese|

* GJ 526
* Gliese 569

Other|

* CFBDSIR 1458+10
* G 166-45
* GD 165
* HAT-P-4
* LHS 2924
* LkCa 19
* 2MASS 1503+2525
* PSR J1518+4904
* SDSS J1416+1348
* Sigma 1785
* TVLM 513-46546
* WASP-14
* ZTF J153932.16+502738.8

Star clusters|

| Globular|

* NGC 5466

|

Galaxies|

| NGC|

* 5008
* 5239
* 5248
* 5249
* 5251
* 5293
* 5332
* 5405
* 5409
* 5411
* 5414
* 5416
* 5417
* 5418
* 5423
* 5424
* 5431
* 5434
* 5434B
* 5436
* 5437
* 5446
* 5454
* 5456
* 5459
* 5463
* 5463B
* 5469
* 5481
* 5482
* 5487
* 5490
* 5490B
* 5490C
* 5492
* 5497
* 5498
* 5499
* 5500
* 5504
* 5504C
* 5505
* 5508
* 5509
* 5511
* 5511A
* 5512
* 5513
* 5514
* 5514A
* 5515
* 5517
* 5518
* 5520
* 5522
* 5523
* 5525
* 5527
* 5528
* 5529
* 5531
* 5532B
* 5533
* 5535
* 5536
* 5538
* 5539
* 5541
* 5542
* 5543
* 5544
* 5545
* 5546
* 5548
* 5550
* 5553
* 5557
* 5559
* 5562
* 5567
* 5568
* 5570
* 5572
* 5579
* 5581
* 5582
* 5583
* 5587
* 5589
* 5590
* 5591
* 5594
* 5596
* 5598
* 5600
* 5601
* 5602
* 5603
* 5603B
* 5608
* 5609
* 5610
* 5611
* 5613
* 5614
* 5615
* 5616
* 5622
* 5623
* 5624
* 5625
* 5627
* 5628
* 5629
* 5630
* 5633
* 5635
* 5637
* 5639
* 5639B
* 5641
* 5642
* 5644
* 5646
* 5647
* 5649
* 5653
* 5654
* 5655
* 5656
* 5657
* 5659
* 5660
* 5665
* 5665A
* 5666
* 5669
* 5672
* 5673
* 5675
* 5676
* 5677
* 5681
* 5682
* 5683
* 5684
* 5685
* 5686
* 5687
* 5689
* 5693
* 5695
* 5696
* 5697
* 5698
* 5699
* 5700
* 5702
* 5707
* 5708
* 5709
* 5710
* 5711
* 5714
* 5717
* 5720
* 5721
* 5722
* 5723
* 5724
* 5727
* 5730
* 5731
* 5732
* 5735
* 5736
* 5737
* 5739
* 5747
* 5748
* 5751
* 5752
* 5753
* 5754
* 5755
* 5758
* 5759
* 5760
* 5762
* 5763
* 5767
* 5769
* 5771
* 5772
* 5773
* 5778
* 5780
* 5782
* 5784
* 5785
* 5787
* 5788
* 5789
* 5790
* 5794
* 5795
* 5797
* 5798
* 5804
* 5805
* 5818
* 5820
* 5821
* 5827
* 5828
* 5828A
* 5829
* 5830
* 5835
* 5837
* 5842
* 5851
* 5852
* 5853
* 5857
* 5859
* 5860
* 5874
* 5875
* 5875A
* 5876
* 5886
* 5888
* 5889
* 5893
* 5895
* 5896
* 5899
* 5900
* 5902
* 5914
* 5914B
* 5918
* 5923
* 5929
* 5930
* 5932
* 5933
* 5934
* 5935
* 5943
* 5945
* 5947
* 5950
* 5966
* 5992
* 5993

|

Other|

* Arp 302
* Boötes I
* Boötes II
* Boötes III
* 3C 295
* 3C 296
* 3C 299
* 3C 303
* 3C 310
* 3C 315
* 4C 12.50
* 4C 26.42
* 4C 37.43
* CLASS B1359+154
* Cloverleaf quasar
* DDO 187
* DDO 190
* 1E 1415.6+2557
* H1426+428
* IRAS 13349+2438
* IRAS 15250+3609
* Markarian 463
* Markarian 477
* Markarian 478
* Markarian 841
* MS 1512-cB58
* OQ 172
* OQ 208
* OQ 530
* PG 1402+261
* PG 1404+226
* PG 1407+265
* PG 1411+442
* PG 1425+267
* PG 1543+489
* PKS 1413+135
* PKS 1424+240
* PKS 1502+106
* QSO B1400+162
* QSO B1422+202
* QSO B1422+231
* QSO B1504+377
* II Zw 71
* II Zw 73

Galaxy
clusters|

* Abell 1775
* Abell 1795
* Abell 1911
* Abell 1914
* Abell 1983
* Abell 2034
* E 1455+2232
* MS 1512.4+3647

Other|

* Boötes void
* GRB 990123
* GRB 010222
* GRB 050802
* GRB 060814
* GRB 080319B
* SCP 06F6

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