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The spectrum of this star fits a [[stellar classification]] of A7IVn,<ref name=Royer2007/> which suggests it is an [[A-type star|A-type]] [[subgiant star]] that has left the [[main sequence]] and is [[stellar evolution|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,<ref name=Eiroa/> and shows a high rotation rate with a [[projected rotational velocity]] of 254 km/s.<ref name=Royer2007/> This rapid spin is giving the star an [[Oblate spheroid|oblate shape]] with an [[equatorial bulge]] that is 29% larger than the polar radius.<ref name=aar20_1_51/> |
The spectrum of this star fits a [[stellar classification]] of A7IVn,<ref name=Royer2007/> which suggests it is an [[A-type star|A-type]] [[subgiant star]] that has left the [[main sequence]] and is [[stellar evolution|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,<ref name=Eiroa/> and shows a high rotation rate with a [[projected rotational velocity]] of 254 km/s.<ref name=Royer2007/> This rapid spin is giving the star an [[Oblate spheroid|oblate shape]] with an [[equatorial bulge]] that is 29% larger than the polar radius.<ref name=aar20_1_51/> |
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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 [[variable star|variability]].<ref name=aaa354_157/> 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 [[Sublimation (phase transition)|sublimate]].<ref name=Eiroa/> Most [[exocomet]] hosts do have a [[Circumstellar disc|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.<ref>{{Cite journal|last1=Cataldi|first1=Gianni|last2=Moór|first2=Attila|last3=Ohashi|first3=Nagayoshi|last4=Eiroa|first4=Carlos|last5=Grady|first5=Carol|last6=Rebollido|first6=Isabel|date=2019-02-22|title=No Detection of Cold Dust around the Potential Exocomet Host ϕ Leo|journal=Research Notes of the AAS|language=en|volume=3|issue=2|pages=39|doi=10.3847/2515-5172/ab082b|s2cid=127680980 |issn=2515-5172}}</ref> |
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 [[variable star|variability]].<ref name=aaa354_157/> 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 [[Sublimation (phase transition)|sublimate]].<ref name=Eiroa/> Most [[exocomet]] hosts do have a [[Circumstellar disc|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.<ref>{{Cite journal|last1=Cataldi|first1=Gianni|last2=Moór|first2=Attila|last3=Ohashi|first3=Nagayoshi|last4=Eiroa|first4=Carlos|last5=Grady|first5=Carol|last6=Rebollido|first6=Isabel|date=2019-02-22|title=No Detection of Cold Dust around the Potential Exocomet Host ϕ Leo|journal=Research Notes of the AAS|language=en|volume=3|issue=2|pages=39|doi=10.3847/2515-5172/ab082b|bibcode=2019RNAAS...3...39C |s2cid=127680980 |issn=2515-5172 |doi-access=free }}</ref> |
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==References== |
==References== |
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| volume=257 | issue=2 | page=69 |
| volume=257 | issue=2 | page=69 |
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| doi=10.3847/1538-4365/ac23cb | arxiv=2109.06839 |
| doi=10.3847/1538-4365/ac23cb | arxiv=2109.06839 |
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| bibcode=2021ApJS..257...69H | s2cid=237503492 }}</ref> |
| bibcode=2021ApJS..257...69H | s2cid=237503492 | doi-access=free |
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}}</ref> |
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<ref name=Mermilliod1986>{{citation |
<ref name=Mermilliod1986>{{citation |
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Leo |
Right ascension | 11h16m 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[3] cgs |
Temperature | 7,680±261[3] K |
Rotational velocity (v sin i) | 254[3] km/s |
Age | 432[3] 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 constellation Leo. 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]
{{cite web}}
: CS1 maint: postscript (link)
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