Lambda Boötis

Short description: Star in the constellation Boötes

λ Boötis

Location of λ Boötis (circled)

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Boötes
Right ascension |  14h 16m 23.018s[1]
Declination | +46° 05′ 17.90″[1]
Apparent magnitude (V) | +4.18[2]
Characteristics
Spectral type | A0p λB[3]
U−B color index | +0.05[2]
B−V color index | +0.08[2]
Variable type | δ Sct[4]
Astrometry
Radial velocity (Rv)| −7.9±1.6[5] km/s
Proper motion (μ)|  RA: −187.698[1] mas/yr
Dec.: 159.309[1] mas/yr
Parallax (π)| 32.5885 ± 0.1410[1] mas
Distance| 100.1 ± 0.4 ly
(30.7 ± 0.1 pc)
Absolute magnitude (MV)| +1.71±0.23[6]
Details
Mass| 1.66+0.19
−0.16[7] M☉
Radius| 1.70±0.10[8] R☉
Luminosity| 16.3±0.6[8] L☉
Surface gravity (log g)| 4.188[9] cgs
Temperature| 8,887±242[8] K
Rotational velocity (v sin i)| 100[9] km/s
Age| 2.8+1.1
−0.8[7] Gyr
Other designations

Xuange, λ Boo, 19 Boötis, BD+46°1949, FK5 527, GC 19273, GJ 3837, HD 125162, HIP 69732, HR 5351, SAO 44965[10]

Database references
SIMBAD| data

Lambda Boötis is a star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from λ Boötis, and abbreviated Lam Boo or λ Boo. It has the official name Xuange,[11] pronounced /ˈʃwɛnɡə/.[citation needed] With an apparent visual magnitude of +4.18, it is faintly visible to the naked eye. Based on parallax measurements, it is 100.1 light-years (30.7 pc) distant from Earth.[1] This star is drifting closer to the Sun with a radial velocity of −8 km/s.[5]

A light curve for Lambda Boötis, plotted from TESS data[12]

This is a white hued A-type main-sequence star with a stellar classification of A0p λB.[3] It is the prototype of a group of rare stars known as Lambda Boötis stars, all of which are dwarf stars with unusually low abundances of metals in their spectra. Its diameter has been directly measured to be 1.7 times that of the Sun.[8] This is a Delta Scuti variable star with a period of 33.1 minutes and an amplitude of 0.0020 in visual magnitude.[4]

This star displays an infrared excess that may be the result of a circumstellar disk of orbiting debris, or else a bow wave from its motion through the interstellar medium.[13]

## Nomenclature

λ Boötis (Latinised to Lambda Boötis) is the star's Bayer designation.

In Chinese astronomy, Lambda Boötis is called 玄戈, Pinyin: Xuángē, meaning 'sombre lance', because this star is marking itself and standing alone in the Sombre Lance asterism, Purple Forbidden enclosure (see : Chinese constellations).[14] 玄戈 (Xuángē) westernized into Heuen Ko, but that name was assigned to Gamma Boötis by R. H. Allen, with the meaning of 'the heavenly spear'.[15] In 2016, the IAU organized a Working Group on Star Names (WGSN)[16] to catalog and standardize proper names for stars. The WGSN approved the name Xuange for Lambda Boötis on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[11]

This star, along with the Aselli (Theta Boötis, Iota Boötis and Kappa Boötis), were Al Aulād al Dhiʼbah (ألعولد ألذعب - al aulād al dhiʼb), "the Whelps of the Hyenas".[17] Al Aulād al Dhiʼbah or Aulad al Thiba was the title of this star in a 1971 NASA memorandum.[18]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 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.
2. ↑ 2.0 2.1 2.2 Johnson, H. L. et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99): 99. Bibcode: 1966CoLPL...4...99J.
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 99: 135. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A.
4. ↑ 4.0 4.1 Chang, S.-W. et al. (2013). "Statistical Properties of Galactic δ Scuti Stars: Revisited". The Astronomical Journal 145 (5): 10. doi:10.1088/0004-6256/145/5/132. 132. Bibcode: 2013AJ....145..132C.
5. ↑ 5.0 5.1 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.
6. ↑ Paunzen, E. et al. (November 2002). "The status of Galactic field λ Bootis stars in the post-Hipparcos era". Monthly Notices of the Royal Astronomical Society 336 (3): 1030–1042. doi:10.1046/j.1365-8711.2002.05865.x. Bibcode: 2002MNRAS.336.1030P.
7. ↑ 7.0 7.1 Montesinos, B. et al. (March 2009). "Parameters of Herbig Ae/Be and Vega-type stars". Astronomy and Astrophysics 495 (3): 901–917. doi:10.1051/0004-6361:200810623. Bibcode: 2009A&A...495..901M.
8. ↑ 8.0 8.1 8.2 8.3 Ciardi et al. (2007). "The Angular Diameter of λ Boötis". The Astrophysical Journal 659 (2): 1623–1628. doi:10.1086/512077. Bibcode: 2007ApJ...659.1623C.
9. ↑ 9.0 9.1 Song, Inseok; Caillault, J.-P.; Barrado y Navascués, David; Stauffer, John R. (February 2001). "Ages of A-Type Vega-like Stars from uvbyβ Photometry". The Astrophysical Journal 546 (1): 352–357. doi:10.1086/318269. Bibcode: 2001ApJ...546..352S.
10. ↑ "lam boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=lam+boo.
11. ↑ 11.0 11.1 "Naming Stars". IAU.org. https://www.iau.org/public/themes/naming_stars/.
12. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
13. ↑ Draper, Z. H. et al. (2016). "IR excesses around nearby Lambda Boo stars are caused by debris discs rather than ISM bow waves". Monthly Notices of the Royal Astronomical Society 456 (1): 459. doi:10.1093/mnras/stv2696. Bibcode: 2016MNRAS.456..459D.
14. ↑ Script error: The function "in_lang" does not exist. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 14 日
15. ↑ Allen, Richard Hinckley. "Star Names — Their Lore and Meaning: Boötes". http://www.constellationsofwords.com/stars/Seginus.html.
16. ↑ "IAU Working Group on Star Names (WGSN)". International Astronomical Union. https://www.iau.org/science/scientific_bodies/working_groups/280/.
17. ↑ Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. 1963. p. 105. ISBN ((978-0-486-21079-7)). https://archive.org/details/starnamestheirlo00alle/page/105. Retrieved 2010-12-12.
18. ↑ Rhoads, Jack W. (November 15, 1971). Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars. Jet Propulsion Laboratory, California Institute of Technology. https://ntrs.nasa.gov/citations/19720005197. Retrieved 2025-05-29.

## External links

* Hoffleit (1991). "HR 5351". Bright Star Catalogue (5th Revised ed.). http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR 5351. Retrieved 2017-09-13.
* "lam Bo0". Centre de Données astronomiques de Strasbourg. https://aladin.cds.unistra.fr/AladinLite/?target=14 16 23.018+46 05 17.90&fov=0.40&survey=P/DSS2/color.

* 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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