40 Leonis Minoris

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40 Leonis Minoris
Leo Minor constellation map.svg
Red circle.svg
Location of 40 LMi (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Leo Minor
Right ascension 10h 43m 01.88241s [1]
Declination +26° 19′ 32.0287″ [1]
Apparent magnitude  (V)5.51±0.01 [2]
Characteristics
Evolutionary stage main sequence star [3]
Spectral type A4 Vn [4]
U−B color index +0.19 [5]
B−V color index +0.17 [5]
Astrometry
Radial velocity (Rv)10±4.3 [6]  km/s
Proper motion (μ)RA: −98.971  mas/yr [1]
Dec.: −65.543  mas/yr [1]
Parallax (π)21.2215 ± 0.0816  mas [1]
Distance 153.7 ± 0.6  ly
(47.1 ± 0.2  pc)
Absolute magnitude  (MV)+2.23 [7]
Details
Mass 1.69 [8]   M☉
Radius 1.54±0.04 [9]   R☉
Luminosity 14.3+1.8
−1.6 [3]   L☉
Surface gravity (log g)4.30±0.04 [9]   cgs
Temperature 7834±108 [10]   K
Metallicity [Fe/H]−0.15 [11]   dex
Rotational velocity (v sin i)211 [12]  km/s
Age 207 [8]   Myr
Other designations
14 H. Leonis Minoris, [13] 40 LMi, AG+26°1125, BD+27°1927, GC  14730, HD  92769, HIP  52422, HR  4189, SAO  81485, WDS J10430+2620A [14]
Database references
SIMBAD data

40 Leonis Minoris (40 LMi) is a white hued star located in the northern constellation Leo Minor. It is rarely called 14 H. Leonis Minoris, which is the designation given by Polis astronomer Johann Hevelius. [13]

It has an apparent magnitude of 5.51, [2] making it faintly visible to the naked eye. The object is located relatively close at a distance of 154 light years based on Gaia DR3 parallax measurements [1] but is receding with a somewhat constrained heliocentric radial velocity of 10  km/s . [6] At 40 LMi's current distance, its brightness is diminished by only 0.02 magnitudes due to interstellar dust. [15]

40 LMi is a chemically peculiar A-type main-sequence star with a stellar classification of A4 Vn. [4] This indicates that it is an A4 dwarf with nebulous absorption lines due to rapid rotation. It has 1.69 times the mass of the Sun [8] and 1.54 times its girth. [9] It radiates 14.3 times the luminosity of the Sun [3] from its photosphere at an effective temperature of 7,834  K . [10] The star is estimated to be 207 million years old, having completed 54.6% of its main sequence lifetime. [3] 40 LMi is slightly metal deficient and spins rapidly with a projected rotational velocity of 211  km/s . [12]

This star was part of a 2005 survey regarding proper motions from the Hipparcos satellite. [16] Its proper motion varied, indicating that an unseen companion may cause it. This led to Peter P. Eggleton and Andrei Tokovinin classifying it as an astrometric binary. [17] There also 3 optical companions located near 40 LMi. Their relative positions and brightness are listed below. [18]

40 Leonis Minoris' companions [18]
Companionmv PA (°)YearSep. (″)
B12.6108201523.8
C13.572201541.6
D13285201546.6

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References

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