Astronomy:41 Sextantis

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Short description: Spectroscopic binary with an Am star
41 Sextantis
Location of 41 Sex on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas/yr
Dec.: −15.814[1] mas/yr
Parallax (π)10.5160 ± 0.0428[1] mas
Distance310 ± 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
Mass2.23[9] M☉
Radius3.10±0.16[10] R☉
Luminosity32.6±1.7[11] L☉
Surface gravity (log g)3.83+0.10−0.07[12] cgs
Temperature7,759[13] K
Metallicity [Fe/H]−0.23[14] dex
Rotational velocity (v sin i)24[5] km/s
Age698+128−108[13] Myr
Ab
Mass1.05[9] M☉
Radius1.3±0.2[5] R☉
Luminosity1.8±0.5[5] L☉
Rotational velocity (v sin i)10[5] km/s
Other designations
41 Sex, BD−08°3018, FK5 1281, GC 14906, HD 93903, HIP 52980, HR 4237, SAO 137823, CCDM J10503-0853A, WDS J10503-0854A[15]
Database references
SIMBADdata

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[16] 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,[17] 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]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 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. doi:10.1086/192182. ISSN 0067-0049. Bibcode: 1995ApJS...99..135A. 
  4. ↑ 4.0 4.1 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. ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 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. doi:10.1088/0004-6256/140/5/1381. ISSN 0004-6256. Bibcode: 2010AJ....140.1381F. 
  6. ↑ 6.0 6.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 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. doi:10.1086/316160. ISSN 0004-6280. Bibcode: 1998PASP..110..580W. 
  9. ↑ 9.0 9.1 9.2 9.3 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. 
  10. ↑ 10.0 10.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  11. ↑ 11.0 11.1 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. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M. 
  12. ↑ Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  13. ↑ 13.0 13.1 13.2 Kunzli, M.; North, P. (February 1998). "Behaviour of calcium abundance in Am-Fm stars with evolution". Astronomy and Astrophysics 330: 651–658. Bibcode: 1998A&A...330..651K. 
  14. ↑ 14.0 14.1 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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  15. ↑ "* 41 Sex". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+41+Sex. 
  16. ↑ 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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  17. ↑ Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars. 5. Bibcode: 1999mctd.book.....H. 
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