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Appearance move to sidebar hide From Wikipedia, the free encyclopedia Star in the constellation Leo φ Leonis
Location of φ Leonis (circled in red)
Observation dataEpoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 16m 39.69960s[1]
Declination −03° 39′ 05.7770″[1]
Apparent magnitude (V) 4.46[2]
Characteristics
Spectral type A7 IVn[3]
U−B color index +0.10[2]
B−V color index +0.22[2]
Astrometry
Radial velocity (Rv)−3.0[4] km/s
Proper motion (μ) RA: −110.37[1] mas/yr Dec.: −37.16[1] mas/yr
Parallax (π)17.71±0.25 mas[1]
Distance184 ± 3 ly (56.5 ± 0.8 pc)
Absolute magnitude (MV)0.56[5]
Details
Mass1.59[6] M☉
Radius2.9[7] R☉
Luminosity39[8] L☉
Surface gravity (log g)3.56[6] cgs
Temperature7,680±261[6] K
Rotational velocity (v sin i)254[3] km/s
Age432[6] Myr
Other designations
φ Leo, 74 Leo, BD−02°3315, FK5 1292, HD 98058, HIP 55084, HR 4368, SAO 138102[9]
Database references
SIMBADdata

Phi Leonis (φ Leo) is a single[10] star in the equatorial-northern constellation Leo, located in the southern celestial hemisphere. It is bright enough to be seen with the naked eye, having an apparent visual magnitude of 4.46.[2] Based upon parallax measurements,[1] the distance to Phi Leo is around 184 light years.

The spectrum of this star fits a stellar classification of A7IVn,[3] which suggests it is an A-type subgiant star that has left the main sequence and is evolving into a giant star. It is being viewed with the plane of the star's equator lying close the line of sight from the Earth,[11] and shows a high rotation rate with a projected rotational velocity of 254 km/s.[3] This rapid spin is giving the star an oblate shape with an equatorial bulge that is 29% larger than the polar radius.[12]

Phi Leonis has been mentioned as a shell star—indicating that there is a circumstellar disk of gas around the star's equator—and may display a slight variability.[5] Sporadic variation of the spectra on the time scale of minutes up to months in duration suggests that solid, cometary bodies are in orbit around the star, with objects approaching close enough for refractory materials to sublimate.[11] Most exocomet hosts do have a circumstellar disk, which can act as an exocomet reservoir. Cold dust around Phi Leonis was not detected, and the star is not associated with a warm debris disk.[13]

References

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  1. ^ 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.
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. ^ a b c d Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
  4. ^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic Fundamental Stars with Direct Solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
  5. ^ a b Hauck, B.; Jaschek, C. (February 2000), "A-shell stars in the Geneva system", Astronomy and Astrophysics, 354: 157–162, Bibcode:2000A&A...354..157H.
  6. ^ a b c d 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.
  7. ^ Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics, 367 (2): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  8. ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  9. ^ "ups Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-29.{{cite web}}: CS1 maint: postscript (link)
  10. ^ Hutter, D. J.; Tycner, C.; Zavala, R. T.; Benson, J. A.; Hummel, C. A.; Zirm, H. (2021). "Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars". The Astrophysical Journal Supplement Series. 257 (2): 69. arXiv:2109.06839. Bibcode:2021ApJS..257...69H. doi:10.3847/1538-4365/ac23cb. S2CID 237503492.
  11. ^ a b Eiroa, C.; Rebollido, I.; Montesinos, B.; Villaver, E.; et al. (September 14, 2016), "Exocomet signatures around the A-shell star Φ Leo?" (PDF), Astronomy & Astrophysics, L1: 594, arXiv:1609.04263, Bibcode:2016A&A...594L...1E, doi:10.1051/0004-6361/201629514, S2CID 41231308.
  12. ^ van Belle, Gerard T., Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
  13. ^ Cataldi, Gianni; Moór, Attila; Ohashi, Nagayoshi; Eiroa, Carlos; Grady, Carol; Rebollido, Isabel (2019-02-22). "No Detection of Cold Dust around the Potential Exocomet Host ϕ Leo". Research Notes of the AAS. 3 (2): 39. Bibcode:2019RNAAS...3...39C. doi:10.3847/2515-5172/ab082b. ISSN 2515-5172. S2CID 127680980.
  • v
  • t
  • e
Constellation of Leo
  • List of stars in Leo
  • Leo in Chinese astronomy
Stars
Bayer
  • α (Regulus)
  • β (Denebola)
  • γ (Algieba)
  • δ (Zosma)
  • ε (Algenubi)
  • ζ (Adhafera)
  • η
  • θ (Chertan)
  • ι
  • κ (Al Minliar al Asad)
  • λ (Alterf)
  • μ (Rasalas)
  • ν
  • ξ
  • ο (Subra)
  • π
  • ρ (Shaomin)
  • σ
  • τ
  • υ
  • φ
  • χ
  • ψ
  • ω
Flamsteed
  • 3
  • 6 (h)
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 15 (f)
  • 18
  • 19
  • 20
  • 21
  • 22 (g)
  • 23
  • 26
  • 31 (Yunü)
  • 33
  • 34
  • 35
  • 37
  • 39
  • 40
  • 42
  • 43
  • 44
  • 45
  • 46
  • 48
  • 49
  • 50
  • 51 (m)
  • 52 (k)
  • 53 (l)
  • 54
  • 55
  • 56
  • 57
  • 58 (d)
  • 59 (c)
  • 60 (b)
  • 61 (p2)
  • 62 (p3)
  • 64
  • 65 (p4)
  • 66
  • 67
  • 69 (p5)
  • 71
  • 72
  • 73 (n)
  • 75
  • 76
  • 79
  • 80
  • 81
  • 82
  • 83
  • 85
  • 86
  • 87 (e)
  • 88
  • 89
  • 90
  • 92
  • 93
  • 95 (o)
  • 6 LMi
  • 18 LMi
  • 49 LMi
  • 52 LMi
Variable
  • R
  • AD
  • CN
  • CW
  • DP
  • EE
  • GQ
HR
  • 4253 (p1)
  • 4459 (Formosa)
HD
  • 81040
  • 88133
  • 89307
  • 96063 (Dingolay)
  • 97658
  • 99109 (Shama)
  • 100777 (Sagarmatha)
  • 102272
Other
  • BD+20 2457
  • Gliese 408
  • Gliese 436 (Noquisi)
  • GJ 3685
  • HVS 7
  • K2-3
  • K2-18
  • 2MASSI J0937347+293142
  • 2MASS J10475385+2124234
  • MACS J1149 Lensed Star 1
  • PSR B0943+10
  • PSR B0950+08
  • SDSS J102915+172927
  • TOI-6894
Exoplanets
  • γ1 Leonis b
  • Gliese 436 b (Awohali)
  • HD 81040 b
  • HD 88133 b
  • HD 89307 b
  • HD 89345 b
  • HD 99109 b (Perwana)
  • HD 100777 b (Laligurans)
  • K2-18b
Galaxies
Messier
  • 65
  • 66
  • 95
  • 96
  • 105
NGC
  • 2903
  • 2906
  • 2911
  • 2964
  • 3032
  • 3041
  • 3048
  • 3049
  • 3067
  • 3134
  • 3177
  • 3185
  • 3187
  • 3190
  • 3193
  • 3226
  • 3227
  • 3239
  • 3274
  • 3301
  • 3338
  • 3346
  • 3357
  • 3362
  • 3367
  • 3370
  • 3377
  • 3384
  • 3412
  • 3426
  • 3436
  • 3447
  • 3455
  • 3489
  • 3501
  • 3506
  • 3507
  • 3521
  • 3524
  • 3535
  • 3593
  • 3596
  • 3598
  • 3599
  • 3602
  • 3604
  • 3605
  • 3607
  • 3608
  • 3628
  • 3632
  • 3640
  • 3646
  • 3647
  • 3664
  • 3666
  • 3678
  • 3681
  • 3684
  • 3686
  • 3697
  • 3705
  • 3710
  • 3758
  • 3799
  • 3800
  • 3801
  • 3805
  • 3806
  • 3810
  • 3816
  • 3821
  • 3837
  • 3840
  • 3841
  • 3842
  • 3844
  • 3845
  • 3851
  • 3857
  • 3859
  • 3860
  • 3861
  • 3862
  • 3864
  • 3867
  • 3868
  • 3873
  • 3875
  • 3883
  • 3884
  • 3886
  • 3900
  • 3902
  • 3908
  • 3925
  • 3937
  • 3947
  • 3951
  • 3954
  • 4002
  • 4003
  • 4005
Numbered
  • I
  • II
  • III
  • IV
  • V
Other
  • CLASS B1152+199
  • Cosmic Horseshoe
  • FBQ 0951+2635
  • IC 2498
  • IC 2628
  • IRAS 10565+2448
  • J1000+1242
  • Leo P
  • Leo T
  • Markarian 1263
  • PSO J172.3556+18.7734
  • QSO J0931+3204
  • SDSS J1029+2623
  • SDSS J110012.38+084616.3
  • UGC 5832
  • UGC 6614
  • UGC 6697
Galaxy clusters
  • MACS J1149.5+2223
Astronomical events
  • SN 1988Z
Category
Retrieved from "https://en.wikipedia.org/w/index.php?title=Phi_Leonis&oldid=1328527321" Categories:
  • A-type subgiants
  • Shell stars
  • Leo (constellation)
  • Bayer objects
  • Flamsteed objects
  • Henry Draper Catalogue objects
  • Hipparcos objects
  • Bright Star Catalogue objects
  • Durchmusterung objects
Hidden categories:
  • CS1 maint: postscript
  • Articles with short description
  • Short description matches Wikidata
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