7 Leonis Minoris

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7 Leonis Minoris
Leo Minor constellation map.svg
Red circle.svg
Location of 7 LMi on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Leo Minor
Right ascension 09h 30m 43.22705s [1]
Declination +33° 39′ 20.5700″ [1]
Apparent magnitude  (V)5.86±0.01 [2]
Characteristics
Evolutionary stage horizontal branch [3]
Spectral type G9 III [4]
B−V color index +1.05 [5]
Astrometry
Radial velocity (Rv)1.7±0.9 [6]  km/s
Proper motion (μ)RA: −23.939  mas/yr [1]
Dec.: −48.160  mas/yr [1]
Parallax (π)7.0542 ± 0.1338  mas [1]
Distance 462 ± 9  ly
(142 ± 3  pc)
Absolute magnitude  (MV)−0.03 [7]
Details
Mass 2.74+0.24
−0.25 [3]   M☉
Radius 13.41±0.68 [8]   R☉
Luminosity 96.0+3.3
−3.6 [1]   L☉
Surface gravity (log g)2.49+0.07
−0.06 [3]   cgs
Temperature 4,923±122 [9]   K
Metallicity [Fe/H]−0.03±0.10 [10]   dex
Rotational velocity (v sin i)0.24 [11]  km/s
Age 575+201
−139 [3]   Myr
Other designations
7 LMi, AG+33°953, BD+34°1999, FK5  2755, GC  13112, HD  82087, HIP  46652, HR  3764, SAO  61529, CCDM J09307+3339A, WDS J09307+3339A, TIC  8855140 [12]
Database references
SIMBAD data

7 Leonis Minoris (7 LMi) is a star located in the northern constellation Leo Minor. It is also designated as HD 82087 and HR 3764. 7 LMi is faintly visible to the naked eye as a yellow-hued point of light with an apparent magnitude of 5.86. [2] Gaia DR3 parallax measurements imply a distance of 462 light-years [1] and it is currently receding with a heliocentric radial velocity of 1.7  km/s . [6] At its current distance, 7 LMi's brightness is diminished by 0.12 magnitudes due to interstellar extinction [13] and it has an absolute magnitude of −0.03. [7]

There have been disagreements on the object's stellar classification. 7 LMi is either a G-type giant star with a class of either G8 or G9 III, [4] or it is a K-type giant with a class of K0 III. [14] It is most likely on the horizontal branch (95% fit), [3] generating energy via helium fusion at its core. It has 2.74 times the mass of the Sun but at the age of 575 million years, [3] it has expanded to 13.41 times the radius of the Sun. [8] It radiates 96 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,923  K . [9] 7 LMi has a near solar metallicity at [Fe/H] = −0.03 [10] and it spins very slowly with a projected rotational velocity of 0.24  km/s . [11]

7 LMi has two visual companions. AG +33°954 is a background star located much farther away than 7 LMi [15] and it is a close spectroscopic binary itself. [16]

7 Leonis Minoris' companions [17]
Companion Stellar classification PA (deg)Separation (arcsec)Apparent magnitude
AG +33°954 (B)G8 IV-V [4] 12561.39.7
CG5 V [4] 21795.911.6

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<span class="mw-page-title-main">10 Leonis Minoris</span> Star in the constellation Leo Minor

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<span class="mw-page-title-main">24 Scorpii</span> Star in the constellation Ophiuchus

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HD 182509, also designated as HR 7370, is an orange hued star located in the southern constellation Telescopium. It has an apparent magnitude of 5.69, making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the object at a distance of 635 light years. It has a poorly constrained heliocentric radial velocity of −5 km/s, indicating that it is drifting towards the Solar System.

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<span class="mw-page-title-main">8 Leonis Minoris</span> Star in the constellation of Leo Minor

8 Leonis Minoris is a solitary, red hued star located in the northern constellation Leo Minor. It has an apparent magnitude 5.37, making it faintly visible to the naked eye. Based on parallax measurements from the Gaia satellite, the object is estimated to be 492 light years distant. It is receding with a heliocentric radial velocity of 40 km/s. At its current distance, 8 LMi is diminshed by 0.12 magnitudes due to interstellar dust.

<span class="mw-page-title-main">23 Leonis Minoris</span> Star in the constellation of Leo Minor

23 Leonis Minoris is a solitary, bluish-white hued star located in the northern constellation Leo Minor. It is positioned 7° south and 11" west from β Leonis Minoris. It is rarely called 7 H. Leonis Minoris, which is its Hevelius designation.

<span class="mw-page-title-main">40 Leonis Minoris</span> Binary star system in the constellation of Leo Minor

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<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

HD 168592, also designated as HR 6862 or rarely 7 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.07. Gaia DR3 parallax measurements place it at a distance of 490 light years and is currently receding with a heliocentric radial velocity of 18 km/s. At its current distance, HD 168592's brightness is diminished by 0.38 magnitudes due to interstellar dust. It has an absolute magnitude of −0.76.

<span class="mw-page-title-main">32 Leonis Minoris</span> Star in the constellation Leo Minor

32 Leonis Minoris, also known as HD 90840, is a solitary star located in the northern constellation Leo Minor. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.78. The object is located relatively far at a distance of 729 light-years based on Gaia DR3 parallax measurements and it is currently receding with a heliocentric radial velocity of 2 km/s, which is somewhat constrained. At its current distance, 32 LMi's brightness is diminished by 0.14 magnitudes due to interstellar extinction and it has an absolute magnitude of −1.02.

<span class="mw-page-title-main">19 Sextantis</span> K-type giant star; Sextans

19 Sextantis, or simply 19 Sex, is a solitary star located in the equatorial constellation Sextans. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.78. Gaia DR3 parallax measurements imply a distance of 516 light-years and it is currently receding with a heliocentric radial velocity of 31.8 km/s. At its current distance, 19 Sex's brightness is diminished by an interstellar extinction of 0.17 magnitudes.

References

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  5. ↑ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode:1970Priv.........0H. S2CID   231475662.
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  9. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  10. 1 2 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (December 15, 2014). "Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity". Astronomy & Astrophysics. 574. EDP Sciences: A116. arXiv: 1412.4634 . Bibcode:2015A&A...574A.116R. doi: 10.1051/0004-6361/201322360 . ISSN   0004-6361. S2CID   59334290.
  11. 1 2 Hekker, S.; Meléndez, J. (December 2007). "Precise radial velocities of giant stars: III. Spectroscopic stellar parameters". Astronomy & Astrophysics. 475 (3): 1003–1009. arXiv: 0709.1145 . Bibcode:2007A&A...475.1003H. doi: 10.1051/0004-6361:20078233 . ISSN   0004-6361. S2CID   10436552.
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  16. ↑ Gaia Collaboration (2022). "VizieR Online Data Catalog: Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1357....0G.
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