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41 Sextantis

Location of 41 Sex on the map (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Sextans
Right ascension	10 50 18.05639
Declination	−08° 53′ 51.9538″
Apparent magnitude (V)	5.79±0.01
Characteristics
Aa
Spectral type	kA3 hA7V mA9
U−B color index	+0.13
B−V color index	+0.16
Ab
Spectral type	F/G
Astrometry
Radial velocity (Rv)	−4.9±2.9 km/s
Proper motion (μ)	RA: −5.694 mas/yr Dec.: −15.814 mas/yr
Parallax (π)	10.5160 ± 0.0428 mas
Distance	310 ± 1 ly (95.1 ± 0.4 pc)
Absolute magnitude (MV)	+0.91
Orbit
Primary	Aa
Period (P)	6.1670 d
Eccentricity (e)	0.014±0.006
Periastron epoch (T)	2,453,690.7442±0.0011 JD
Argument of periastron (ω) (secondary)	272±4°
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 M☉
Radius	3.10±0.16 R☉
Luminosity	32.6±1.7 L☉
Surface gravity (log g)	3.83 −0.07 cgs
Temperature	7,759 K
Metallicity	−0.23 dex
Rotational velocity (v sin i)	24 km/s
Age	698 −108 Myr
Ab
Mass	1.05 M☉
Radius	1.3±0.2 R☉
Luminosity	1.8±0.5 L☉
Rotational velocity (v sin i)	10 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
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, 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 and it is drifting closer with a heliocentric radial velocity of approximately −4.9 km/s. At its current distance, 41 Sex's brightness is diminished by an interstellar extinction of 0.16 magnitudes and it has an absolute magnitude of +0.91.

The visible component has a stellar classification of kA3hA7VmA9, 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, 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 and a slightly enlarged radius 3.10 times that of the Sun. It radiates 32.6 times the luminosity of the Sun from its photosphere at an effective temperature of 7,759 K, 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 and it spins modestly with a projected rotational velocity of 24 km/s.

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. It has 105% the mass of the Sun and 1.3 times the radius of the Sun. It radiates 1.8 times the luminosity of the Sun from its photosphere. It spins slowly with a projected rotational velocity of 10 km/s.

References

1. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
3. ^ Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. ISSN 0067-0049. S2CID 120495962.
4. ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
5. ^ Fekel, Francis C.; Williamson, Michael H. (November 1, 2010). "New Precision Orbits of Bright Double-lined Spectroscopic Binaries. V. The Am Stars HD 434 and 41 Sextantis". The Astronomical Journal. 140 (5): 1381–1390. Bibcode:2010AJ....140.1381F. doi:10.1088/0004-6256/140/5/1381. ISSN 0004-6256. S2CID 14261237.
6. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
7. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
8. ^ Worek, Thaddeus F. (May 1998). "Concerning the Reported Phase‐modulated Changes in the Spectrum of 41 Sextantis". Publications of the Astronomical Society of the Pacific. 110 (747): 580–585. Bibcode:1998PASP..110..580W. doi:10.1086/316160. ISSN 0004-6280. S2CID 121074533.
9. ^ Kraicheva, Z.; Popova, E.; Tutukov, A.; Yungelson, L. (July 1980). "Catalogue of physical parameters of spectroscopic binary stars". Bull. Inf. Centre Données Stellaires. 19: 71. Bibcode:1980BICDS..19...71K. S2CID 118298938.
10. ^ Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
11. ^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711. S2CID 73594365.
12. 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.
13. ^ Kunzli, M.; North, P. (February 1998). "Behaviour of calcium abundance in Am-Fm stars with evolution". Astronomy and Astrophysics. 330: 651–658. arXiv:astro-ph/9710223. Bibcode:1998A&A...330..651K. doi:10.48550/ARXIV.ASTRO-PH/9710223. S2CID 5679821.
14. ^ Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
15. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
16. "* 41 Sex". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 12, 2024.
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.

v t e Constellation of Sextans
List of stars in Sextans Sextans in Chinese astronomy
Stars	Bayer α β γ δ ε Flamsteed 3 4 5 6 7 9 12 13 14 16 17 18 19 20 21 23 24 25 26 27 31 32 33 34 35 36 39 40 41 Variable S T Y RW SW VY HR 3879 3901 3907 3915 3959 4000 4034 4059 4060 4085 4092 4109 4122 4224 4233 4240 HD 85461 86081 86341 90057 92788 93396 Other BD−08°2823 FIRST J102347.6+003841 Gliese 382 Gliese 393 LHS 292 PG 1026+002 PG 1047+003 PSR J0952–0607 TOI-561 WASP-43
Exoplanets BD-08°2823 b c HD 86081 b HD 92788 b KELT-11b WASP-43b TOI-561 b
Galaxies	NGC 2974 3044 3110 3115 3156 3169 3341 Other Baby Boom Galaxy CID-42 Cosmos Redshift 7 HD1 LAE J095950.99+021219.1 PGC 29820 REBELS-25 Sextans A Sextans B Sextans Dwarf Spheroidal AT2018hyz
Galaxy clusters CL J1001+0220 Hyperion proto-supercluster
Category

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• A-type main-sequence stars
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• Sextans
• Flamsteed objects
• Gould objects
• Durchmusterung objects
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• Hipparcos objects
• Bright Star Catalogue objects
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