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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]
Distance	184 ± 3 ly (56.5 ± 0.8 pc)
Absolute magnitude (MV)	0.56[5]
Details
Mass	1.59[6] M☉
Radius	2.9[7] R☉
Luminosity	39[8] L☉
Surface gravity (log g)	3.56[6] cgs
Temperature	7,680±261[6] K
Rotational velocity (v sin i)	254[3] km/s
Age	432[6] Myr
Other designations
φ Leo, 74 Leo, BD−02°3315, FK5 1292, HD 98058, HIP 55084, HR 4368, SAO 138102[9]
Database references
SIMBAD	data

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

[edit]

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 2MASS J09373487+2931409 2MASS J10475385+2124234 2MASS J11151597+1937266 BD+20 2457 Gliese 408 Gliese 436 (Noquisi) GJ 3685 HVS 7 K2-3 K2-18 MACS J1149 Lensed Star 1 PSR B0943+10 PSR B0950+08 SDSS J102915+172927 TOI-6894 WISEPC J112254.73+255021.5
Exoplanets 83 Leonis Bb 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) K2-3b K2-3c K2-3d K2-18b K2-22b KELT-4Ab WASP-104b
Nebulae Frosty Leo Nebula Leo Ring VT 1137-0337
Galaxies	Messier 65 66 95 96 105 NGC 2903 2906 2911 2927 2964 2968 3019 3026 3032 3041 3048 3049 3067 3134 3177 3185 3187 3190 3193 3226 3227 3239 3274 3300 3301 3338 3346 3357 3362 3367 3370 3377 3384 3389 3412 3426 3436 3437 3443 3447 3455 3457 3489 3501 3506 3507 3509 3521 3524 3535 3593 3596 3598 3599 3602 3604 3605 3607 3608 3628 3632 3640 3646 3647 3664 3666 3678 3681 3684 3686 3689 3697 3705 3710 3745 3746 3748 3750 3751 3753 3754 3758 3790 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 3910 3925 3929 3937 3940 3943 3947 3951 3954 3987 3988 4002 4003 4005 Numbered I II III IV V Other Abell 1201 BCG Arp 87 CLASS B1152+199 Cosmic Horseshoe FBQ 0951+2635 IC 2486 IC 2498 IC 2628 IC 2759 IRAS 10565+2448 J1000+1242 KKh 060 Leo P Leo T MACS1149-JD1 Markarian 1263 PKS J1158+2621 Pōniuāʻena PSO J172.3556+18.7734 QSO J0931+3204 SDSS J0927+2943 SDSS J1029+2623 SDSS J1106+1939 SDSS J1108+0659 SDSS J110012.38+084616.3 SDSS J113706.18−033737.1 Segue 1 UGC 5832 UGC 6093 UGC 6614 UGC 6697 ULAS J1120+0641
Galaxy clusters Abell 1413 Clowes–Campusano LQG Coma Supercluster Copeland Septet Hickson 44 Huge-LQG Leo Cluster Leo Supercluster Leo Triplet M96 Group MACS J1149.5+2223 U1.11
Astronomical events GRB 830801 GRB 030329 GRB 090423 GRB 130427A SN 1988Z SN 1997bs SN Refsdal
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
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