41 Sextantis

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41 Sextantis
Sextans constellation map.svg
Red circle.svg
Location of 41 Sex on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension 10h 50m 18.05639s [1]
Declination −08° 53′ 51.9538″ [1]
Apparent magnitude  (V)5.79±0.01 [2]
Characteristics
Aa
Spectral type kA3 hA7V mA9 [3]
U−B color index +0.13 [4]
B−V color index +0.16 [4]
Ab
Spectral type F/G [5]
Astrometry
Radial velocity (Rv)−4.9±2.9 [6]  km/s
Proper motion (μ)RA: −5.694  mas/yr [1]
Dec.: −15.814  mas/yr [1]
Parallax (π)10.5160 ± 0.0428  mas [1]
Distance 310 ± 1  ly
(95.1 ± 0.4  pc)
Absolute magnitude  (MV)+0.91 [7]
Orbit [5]
PrimaryAa
Period (P)6.1670  d
Eccentricity (e)0.014±0.006 [8]
Periastron epoch (T)2,453,690.7442±0.0011  JD
Argument of periastron (ω)
(secondary)		272±4 [8] °
Semi-amplitude (K1)
(primary)		46.67±0.04 km/s
Semi-amplitude (K2)
(secondary)		93.06±0.20 km/s
Details
Aa
Mass 2.23 [9]   M☉
Radius 3.10±0.16 [10]   R☉
Luminosity 32.6±1.7 [11]   L☉
Surface gravity (log g)3.83+0.10
−0.07 [12]   cgs
Temperature 7,759 [13]   K
Metallicity [Fe/H]−0.23 [14]   dex
Rotational velocity (v sin i)24 [5]  km/s
Age 698+128
−108 [13]   Myr
Ab
Mass 1.05 [9]   M☉
Radius 1.3±0.2 [5]   R☉
Luminosity1.8±0.5 [5]   L☉
Rotational velocity (v sin i)10 [5]  km/s
Other designations
41 Sex, 74 G. Sextantis [15] , BD−08°3018, FK5  1281, GC  14906, HD  93903, HIP  52980, HR  4237, SAO  137823, CCDM J10503-0853A, WDS J10503-0854A [16]
Database references
SIMBAD data

41 Sextantis (HD 93903; HR 4237; 74 G. Sextantis), or simply 41 Sex is a spectroscopic binary located in the equatorial constellation Sextans. It has an apparent magnitude of 5.79, [2] making it faintly visible to the naked eye under ideal conditions. The system is located relatively close at a distance of 310 light-years based on Gaia DR3 parallax measurements [1] and it is drifting closer with a heliocentric radial velocity of approximately −4.9  km/s . [6] At its current distance, 41 Sex's brightness is diminished by an interstellar extinction of 0.16 magnitudes [17] and it has an absolute magnitude of +0.91. [7]

The visible component has a stellar classification of kA3hA7VmA9, [3] indicating that it is an Am star with the calcium K-lines of an A3 star, the hydrogen lines and effective temperature of an A7 main-sequence star, and the metal lines of an A9 star. Houk & Swift (1999) give a class of A2/3 III, [18] indicating that it is an A-type star that has the characteristics of an A2 and A3 giant star. It has 2.23 times the mass of the Sun [9] and a slightly enlarged radius 3.10 times that of the Sun. [10] It radiates 32.6 times the luminosity of the Sun [11] from its photosphere at an effective temperature of 7,759  K , [13] giving it a white-hue when viewed in the night sky. 41 Sextantis Aa is metal-deficient with an iron abundance 58.9% that of the Sun [14] and it spins modestly with a projected rotational velocity of 24  km/s . [5]

The companion's spectrum is very weak compared to the primary, but it is said to be either a late F-type star or an early G-type star. [5] It has 105% the mass of the Sun [9] and 1.3 times the radius of the Sun. [5] It radiates 1.8 times the luminosity of the Sun from its photosphere. [5] It spins slowly with a projected rotational velocity of 10 km/s. [5]

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<span class="mw-page-title-main">25 Sextantis</span> Alpha2 Canum Venactiorum variable.

25 Sextantis, or simply 25 Sex, is a star located in the equatorial constellation Sextans; it also bears the variable star designation SS Sextantis. With an average apparent magnitude of 5.97, 25 Sex is barely visible to the naked eye, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 345 light-years, and it is currently drifting away with a heliocentric radial velocity of approximately 23 km/s. At its current distance, 25 Sex's average brightness is diminished by an interstellar extinction of 0.17 magnitudes and it has an absolute magnitude of +0.86.

References

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  17. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118879856.
  18. ↑ Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars. Vol. 5. Bibcode:1999mctd.book.....H.
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