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Beta Serpentis - Wikipedia

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β Serpentis
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of β Serpentis (circled)
Constellation	Serpens
Right ascension	15^h 46^m 11.25435^s^[1]
Declination	+15° 25′ 18.5959″^[1]
Apparent magnitude (V)	+3.65^[2] (3.68 + 9.7)^[3]
Characteristics
Spectral type	A2 V^[4] or A2 IV^[5] + K3 V^[3]
U−B color index	+0.09^[2]
B−V color index	+0.073^[4]
Astrometry

Radial velocity (R_v)	+0.6±0.3^[6] km/s
Proper motion (μ)	RA: +65.38^[1] mas/yr Dec.: −38.61^[1] mas/yr
Parallax (π)	21.03 ± 0.26 mas^[1]
Distance	155 ± 2 ly (47.6 ± 0.6 pc)
Absolute magnitude (M_V)	+0.30/+6.59^[7]

Details^[8]

Mass	1.828+0.027 −0.03 `M`_☉
Radius	4.195 (equatorial) 3.07 (polar) `R`_☉
Luminosity	58.17+2.57 −2.25 `L`_☉
Surface gravity (log g)	3.27^[9] cgs
Temperature	6,967 (equatorial) 9,359 (polar) K
Rotational velocity (v sin i)	216.6+8.1 −8.7 km/s
Age	610+14 −35 Myr

Other designations
β Ser, 28 Serpentis, BD+15° 2911, HD 141003, HIP 77233, HR 5867, SAO 101725, ADS 9778, CCDM 15461+1525^[10]
Database references
SIMBAD	data

Beta Serpentis, Latinized from β Serpentis, is a binary star^[3] system in the constellation Serpens, in its head (Serpens Caput). It is visible to the naked eye with a combined apparent visual magnitude of +3.65.^[2] Based upon an annual parallax shift of 21.03 mas as seen from Earth,^[1] it is located around 155 light years from the Sun. The system is a member of the Ursa Major Moving Group.^[7]

Components

The visual magnitude +3.68 primary, component A, is either an ordinary A-type main-sequence star or somewhat evolved subgiant with a stellar classification of A2 V^[4] or A2 IV,^[5] respectively. The star is about 610 million years old with 1.8 the mass of the Sun. It is spinning rapidly with a projected rotational velocity of 216.6 km/s, which causes it to have an oblate shape, as well as hotter temperatures in the poles due to gravity darkening. The equatorial radius measures 4.2 R_☉ and has an effective temperature of 6,967 K, while the polar radius measures 3.7 R_☉ and has an effective temperature of 9,359 K.^[8]

The secondary component, visual magnitude 9.7 B, lies at an angular separation of 30.6 arc seconds. It is a main-sequence star with a class of K3 V.^[3]

There is a magnitude +10.98 visual companion, designated component C, located 202 arcseconds away.^[11]

Nomenclature

It was a member of indigenous Arabic asterism al-Nasaq al-Sha'āmī, "the Northern Line" of al-Nasaqān "the Two Lines",^[12] along with β Her (Kornephoros), γ Her (Hejian, Ho Keen) and γ Ser (Zheng, Ching).^[13]

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, al-Nasaq al-Sha'āmī or Nasak Shamiya were the title for three stars :β Ser as Nasak Shamiya I, γ Ser as Nasak Shamiya II, γ Her as Nasak Shamiya III (exclude β Her).^[14]

In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven old states in China and which marks the right borderline of the enclosure, consisting of β Serpentis, β Herculis, γ Herculis, κ Herculis, γ Serpentis, δ Serpentis, α Serpentis, ε Serpentis, δ Ophiuchi, ε Ophiuchi and ζ Ophiuchi.^[15] Consequently, the Chinese name for β Serpentis itself is 天市右垣五 (Tiān Shì Yòu Yuán wu, English: the Fifth Star of Right Wall of Heavenly Market Enclosure), represent Zhou (周) (possibly Chow, the dynasty in China),^[16]^[17]^[18] together with η Capricorni and 21 Capricorni in Twelve States (asterism).^[19]

References

^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b ^c Lutz, T. E.; Lutz, J. H. (June 1977), "Spectral classification and UBV photometry of bright visual double stars", Astronomical Journal, 82: 431–434, Bibcode:1977AJ.....82..431L, doi:10.1086/112066.
^ ^a ^b ^c ^d Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ ^a ^b ^c Jones, Jeremy; et al. (November 2015), "The Ages of A-Stars. I. Interferometric Observations and Age Estimates for Stars in the Ursa Major Moving Group", The Astrophysical Journal, 813 (1): 18, arXiv:1508.05643, Bibcode:2015ApJ...813...58J, doi:10.1088/0004-637X/813/1/58, S2CID 16600591, 58.
^ ^a ^b Gray, R. O.; Garrison, R. F. (December 1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement, 65: 581, Bibcode:1987ApJS...65..581G, doi:10.1086/191237.
^ 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.
^ ^a ^b King, Jeremy R.; et al. (April 2003), "Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group", The Astronomical Journal, 125 (4): 1980–2017, Bibcode:2003AJ....125.1980K, doi:10.1086/368241.
^ ^a ^b Jones, Jeremy; White, R. J.; Boyajian, T.; Schaefer, G.; Baines, E.; Ireland, M.; Patience, J.; Brummelaar, T. ten; McAlister, H.; Ridgway, S. T.; Sturmann, J.; Sturmann, L.; Turner, N.; Farrington, C.; Goldfinger, P. J. (2015-10-28). "The Ages of A-Stars I: Interferometric Observations and Age Estimates for Stars in the Ursa Major Moving Group". The Astrophysical Journal. 813 (1): 58. arXiv:1508.05643. doi:10.1088/0004-637X/813/1/58. ISSN 1538-4357.
^ 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
^ "bet Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-22.{{cite web}}: CS1 maint: postscript (link)
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
^ Kunitzsch, P.; Smart, T. (2006), A Dictionary of Modern Star names: A Short Guide to 254 Star names and Their Derivations (Second Revised ed.), Cambridge, Massachusetts: Sky Publishing, p. 31, ISBN 1-931559-44-9.
^ Allen, R. H. (1963) [1899], "Hercules", Star Names: Their Lore and Meaning (Dover ed.), New York, NY: Dover Publications Inc, p. 243, ISBN 0-486-21079-0, retrieved 2017-09-22.
^ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), California Institute of Technology: Jet Propulsion Laboratory.
^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
^ Allen, R. H. (1963) [1899], "Serpens", Star Names: Their Lore and Meaning (Dover ed.), New York, NY: Dover Publications Inc, p. 376, ISBN 0-486-21079-0, retrieved 2017-09-22.
^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 24 日 Archived 2019-04-04 at the Wayback Machine
^ (in Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived 2010-08-10 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
^ Allen, R. H. (1963) [1899], "Capricornus", Star Names: Their Lore and Meaning (Dover ed.), New York, NY: Dover Publications Inc, p. 142, ISBN 0-486-21079-0, retrieved 2017-09-22.

Constellation of Serpens

Stars

Bayer	α (Unukalhai) β (Chow) γ (Ainalhai) δ ε ζ η θ (Alya) ι κ (Gudja) λ μ ν ξ ο π ρ σ τ¹ τ² τ³ τ⁴ τ⁵ τ⁶ τ⁷ τ⁸ υ φ χ ψ ω
Flamsteed	3 4 5 6 7 8 10 11 (A¹) 14 16 25 (A²) 29 36 (b) 39 40 43 45 46 47 59 (d) 60 (c) 61 64 3 Her
Variable	R W X RT UZ VV VY WX AA AN AO AP AR AU BQ CT CV CW EG FH FI FK FL FQ FR LV LW LX MR MS MT MV MY NN NO NQ NW OO OU PS QV QX QY V382 V411
HR	5665 5690 5692 5706 5711 5740 5745 5783 5796 5831 5850 5859 5861 5874 5909 5913 5931 5992 6005 6011 6014 6016 6449 6496 6544 6562 6568 6600 6620 6666 6681 6755 6756 6757 6785 6830 6840 6843 6858 6890 6898 6928 6993 (e) 6999 7008 7048 7076 7144
HD	135061 135615 136027 136118 138085 142245 143436 145936 146740 157969 168112 168443 168746 (Alasia) 175541 (Kaveh)
Other	ADS 9544 AS 296 9 11 22 23 27 Gliese 701 Gliese 710 GJ 1224 GX 17+2 IRAS 18418-0440 MWC 297 MWC 922 PG 1510+234 PG 1605+072 PSR B1534+11 PSR J1719−1438 Ross 508 Serpens FIRS 1 Serpens SVS 20 Serpens X-1 W40 IRS 1A South

Exoplanets	CoRoT-9b CoRoT-11b CoRoT-22b CoRoT-23b CoRoT-27b HD 168746 b (Onasilos) HD 175541 b (Kavian) ω Serpentis b

Star
clusters

NGC	NGC 6535 NGC 6539 NGC 6604 NGC 6605
Other	IC 4756 Messier 5 Messier 16 Serpens OB2 Serpens South Palomar 5

Nebulae

Other	Abell 41 Eagle Nebula L134 L183 L483 Serpens cloud Sh2-54 Westerhout 40 Red Square Nebula S68

Galaxies

NGC

5887
5910
5911
5913
5919
5920
5921
5926
5928
5931
5936
5937
5940
5942
5941
5944
5951
5953
5954
5952
5956
5955
5957
5960
5962
5964
5970
5972
5975
5977
5980
5983
5984
5988
5991
5990
5994
5996
5997
6003
6004
6008
6006
6007
6009
6012
6010
6014
6020
6017
6018
6021
6022
6023
6027
6027a
6027b
6027c
6027d
6027e
6029
6033
6037
6036
6051
6063
6065
6066
6070
6080
6100
6118
6172

Other

Galaxy clusters	Abell 2040 Abell 2052 Abell 2063 Abell 2107 AWM 4 MKW 3s Seyfert's Sextet

Astronomical events	GRB 970111 GRB 050813 GRB 060418 GRB 060526 SN 2004dk