{{Short description|Spectroscopic binary with an Am star}} {{Starbox begin | name = [[Flamsteed designation|41 Sextantis]] }} {{Starbox image | image = {{Location mark | image = Sextans constellation map.svg | float = center | width = 260 | position = right | mark = Red circle.svg | mark_width = 6 | mark_link = 41 Sextantis | x = 122 | y = 870 }} | caption = Location of 41 Sex on the map (circled) }} {{Starbox observe | epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Sextans]] | ra = {{RA|10|50|18.05639}}<ref name = GaiaDR3/> | dec = {{DEC|−08|53|51.9538}}<ref name = GaiaDR3/> | appmag_v = 5.79{{±|0.01}}<ref name = Tycho2000/> }} {{Starbox character | component1 = Aa | class = kA3 hA7V mA9<ref name = Abt1995/> | b-v = +0.16<ref name = Johnson1966/> | u-b = +0.13<ref name = Johnson1966/> | component2 = Ab | class2 = F/G<ref name = Fekel2010/> }} {{Starbox astrometry | radial_v = −4.9{{±|2.9}}<ref name = Gontcharov2006/> | parallax = 10.5160 | p_error = 0.0428 | parallax_footnote = <ref name = GaiaDR3/> | prop_mo_ra = −5.694 | prop_mo_dec = −15.814 | pm_footnote = <ref name = GaiaDR3/> | absmag_v = +0.91<ref name = Anderson2012/> }} {{Starbox orbit | reference = <ref name = Fekel2010/> | primary = Aa | component = Ab | period_unitless = {{val|6.1670|ul=days}} | periastron = {{val|2453690.7442|0.0011|ul=JD|fmt=commas}} | eccentricity = 0.014{{±|0.006}}<ref name = Worek1998/> | periarg = 272{{±|4}}<ref name = Worek1998/> | k1 = 46.67{{±|0.04}} | k2 = 93.06{{±|0.20}} }} {{Starbox detail | component1 = Aa | mass = 2.23<ref name = Kraicheva1980/> | radius = 3.10{{±|0.16}}<ref name = Kervella2004/> | luminosity = 32.6{{±|1.7}}<ref name = McDonald2017/> | gravity = 3.83{{±|0.10|0.07}}<ref name = Stassun2019/> | temperature = 7,759<ref name = Kunzli1998/> | metal_fe = −0.23<ref name = Anders2019/> | rotational_velocity = 24<ref name = Fekel2010/> | age_myr = 698{{±|128|108}}<ref name = Kunzli1998/> | component2 = Ab | mass2 = 1.05<ref name = Kraicheva1980/> | radius2 = 1.3{{±|0.2}}<ref name = Fekel2010/> | luminosity2 = 1.8{{±|0.5}}<ref name = Fekel2010/> | rotational_velocity2 = 10<ref name = Fekel2010/> }} {{Starbox catalog | names = {{odlist|F = 41 Sex|Gould = 74 G. Sextantis<ref name = Gould1879/>|BD = −08°3018|CCDM = J10503-0853A|FK5 = 1281|GC = 14906|HD = 93903|HIP = 52980|HR = 4237|SAO = 137823|WDS = J10503-0854A}}<ref name = SIMBAD/> }} {{Starbox reference | Simbad = *41+Sex }} {{Starbox end}}
'''41 Sextantis''' ('''HD 93903; HR 4237; 74 G. Sextantis'''), or simply '''41 Sex''' is a [[spectroscopic binary]] located in the [[celestial equator|equatorial]] [[constellation]] [[Sextans]]. It has an [[apparent magnitude]] of 5.79,<ref name = Tycho2000/> making it faintly visible to the [[naked eye]] under ideal conditions. The system is located relatively close at a distance of 310 [[light-year]]s based on [[Gaia DR3]] [[parallax]] measurements<ref name = GaiaDR3/> and it is drifting closer with a heliocentric [[radial velocity]] of approximately {{val|-4.9|ul=km/s}}.<ref name = Gontcharov2006/> At its current distance, 41 Sex's brightness is diminished by an [[interstellar extinction]] of 0.16 [[magnitude (astronomy)|magnitude]]s<ref name = Gontcharov2017/> and it has an [[absolute magnitude]] of +0.91.<ref name = Anderson2012/>
The visible component has a [[stellar classification]] of kA3hA7VmA9,<ref name = Abt1995/> indicating that it is an [[Am star]] with the [[calcium K-line]]s 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,<ref name = Houk1999/> 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]]<ref name = Kraicheva1980/> and a slightly enlarged [[radius]] 3.10 times that of the [[Sun]].<ref name = Kervella2004/> It radiates 32.6 times the [[luminosity of the Sun]]<ref name = McDonald2017/> from its [[photosphere]] at an effective temperature of {{val|7759|ul=K|fmt=commas}},<ref name = Kunzli1998/> 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<ref name = Anders2019/> and it spins modestly with a [[projected rotational velocity]] of {{val|24|ul=km/s}}.<ref name = Fekel2010/>
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]].<ref name = Fekel2010/> It has 105% the mass of the Sun<ref name = Kraicheva1980/> and 1.3 times the [[radius of the Sun]].<ref name = Fekel2010/> It radiates 1.8 times the luminosity of the Sun from its photosphere.<ref name = Fekel2010/> It spins slowly with a [[projected rotational velocity]] of 10 km/s.<ref name = Fekel2010/>
<!--I'm having trouble writing the discovery section--> ==References== {{reflist||refs=
<ref name = GaiaDR3>{{Cite DR3|3762853390993791488}}</ref>
<ref name = Tycho2000>{{cite journal | last1 = Høg | first1 = E. | last2 = Fabricius | first2 = C. | last3 = Makarov | first3 = V. V. | last4 = Urban | first4 = S. | last5 = Corbin | first5 = T. | last6 = Wycoff | first6 = G. | last7 = Bastian | first7 = U. | last8 = Schwekendiek | first8 = P. | last9 = Wicenec | first9 = A. | title = The Tycho-2 catalogue of the 2.5 million brightest stars | journal = Astronomy and Astrophysics | date = March 2000 | volume = 355 | pages = L27–L30 | s2cid = 17128864 | bibcode = 2000A&A...355L..27H | issn = 0004-6361}}</ref>
<ref name = Houk1999>{{cite book | last1 = Houk | first1 = Nancy | last2 = Swift | first2 = Carrie | title = Michigan catalogue of two-dimensional spectral types for the HD Stars | volume = 5 | year = 1999 | bibcode = 1999mctd.book.....H}}</ref>
<ref name = Abt1995>{{cite journal |last1=Abt |first1=Helmut A. |last2=Morrell |first2=Nidia I. |title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars |journal=The Astrophysical Journal Supplement Series |date=July 1995 |volume=99 |pages=135 |doi=10.1086/192182 |issn=0067-0049 |bibcode=1995ApJS...99..135A |s2cid=120495962 |doi-access=free}}</ref>
<ref name = Johnson1966>{{cite journal | last1 = Johnson | first1 = H. L. | last2 = Mitchell | first2 = R. I. | last3 = Iriarte | first3 = B. | last4 = Wisniewski | first4 = W. Z. | title = UBVRIJKL Photometry of the Bright Stars | journal = Communications of the Lunar and Planetary Laboratory | year = 1966 | volume = 4 | pages = 99–110 | bibcode = 1966CoLPL...4...99J}}</ref>
<ref name = Gontcharov2006>{{cite journal | last1 = Gontcharov | first1 = G. A. | title = Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system | journal = Astronomy Letters | date = November 2006 | volume = 32 | issue = 11 | pages = 759–771 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773706110065 | pmid = | bibcode = 2006AstL...32..759G | arxiv = 1606.08053 | s2cid = 119231169 }}</ref>
<ref name = Anderson2012>{{cite journal | last1 = Anderson | first1 = E. | last2 = Francis | first2 = Ch. | title = XHIP: An extended hipparcos compilation | journal = Astronomy Letters | date = May 2012 | volume = 38 | issue = 5 | pages = 331–346 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712050015 | bibcode = 2012AstL...38..331A | arxiv = 1108.4971| s2cid = 119257644}}</ref>
<ref name = Gontcharov2017>{{cite journal | last1 = Gontcharov | first1 = George A. | last2 = Mosenkov | first2 = Aleksandr V. | title = Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars | journal = Monthly Notices of the Royal Astronomical Society | date = 28 September 2017 | volume = 472 | issue = 4 | pages = 3805–3820 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1093/mnras/stx2219 | bibcode = 2017MNRAS.472.3805G | arxiv = 1709.01160 | s2cid = 118879856 | doi-access = free}}</ref>
<ref name = Fekel2010>{{cite journal | last1=Fekel | first1=Francis C. | last2=Williamson | first2=Michael H. | title=New Precision Orbits of Bright Double-lined Spectroscopic Binaries. V. The Am Stars HD 434 and 41 Sextantis | journal=The Astronomical Journal | volume=140 | issue=5 | date=November 1, 2010 | issn=0004-6256 | doi=10.1088/0004-6256/140/5/1381 | s2cid = 14261237 | pages=1381–1390 | bibcode = 2010AJ....140.1381F | doi-access = free}}</ref>
<ref name = Kraicheva1980>{{cite journal |last1=Kraicheva |first1=Z. |last2=Popova |first2=E. |last3=Tutukov |first3=A. |last4=Yungelson |first4=L. |title=Catalogue of physical parameters of spectroscopic binary stars. |journal=Bull. Inf. Centre Données Stellaires |date=July 1980 |volume=19 |page=71 |s2cid=118298938 |bibcode=1980BICDS..19...71K}}</ref>
<ref name = Worek1998>{{cite journal | last=Worek | first=Thaddeus F. | title=Concerning the Reported Phase-modulated Changes in the Spectrum of 41 Sextantis | journal=Publications of the Astronomical Society of the Pacific | volume=110 | issue=747 | date=May 1998 | issn=0004-6280 | doi=10.1086/316160 | s2cid = 121074533 | pages=580–585 | bibcode = 1998PASP..110..580W | doi-access = free}}</ref>
<ref name = Kervella2004>{{cite journal | last1 = Kervella | first1 = P. | last2 = Thévenin | first2 = F. | last3 = Di Folco | first3 = E. | last4 = Ségransan | first4 = D. | title = The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry | journal = Astronomy & Astrophysics | date = April 8, 2004 | volume = 426 | issue = 1 | pages = 297–307 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361:20035930 | s2cid = 6077801 | bibcode = 2004A&A...426..297K | arxiv = astro-ph/0404180 | doi-access = free}}</ref>
<ref name = Stassun2019>{{cite journal | display-authors = 1 | last1 = Stassun | first1 = Keivan G. | last2 = Oelkers | first2 = Ryan J. | last3 = Paegert | first3 = Martin | last4 = Torres | first4 = Guillermo | last5 = Pepper | first5 = Joshua | last6 = Lee | first6 = Nathan De | last7 = Collins | first7 = Kevin | last8 = Latham | first8 = David W. | last9 = Muirhead | first9 = Philip S. | last10 = Chittidi | first10 = Jay | last11 = Rojas-Ayala | first11 = Bárbara | last12 = Fleming | first12 = Scott W. | last13 = Rose | first13 = Mark E. | last14 = Tenenbaum | first14 = Peter | last15 = Ting | first15 = Eric B. | last16 = Kane | first16 = Stephen R. | last17 = Barclay | first17 = Thomas | last18 = Bean | first18 = Jacob L. | last19 = Brassuer | first19 = C. E. | last20 = Charbonneau | first20 = David | last21 = Ge | first21 = Jian | last22 = Lissauer | first22 = Jack J. | last23 = Mann | first23 = Andrew W. | last24 = McLean | first24 = Brian | last25 = Mullally | first25 = Susan | last26 = Narita | first26 = Norio | last27 = Plavchan | first27 = Peter | last28 = Ricker | first28 = George R. | last29 = Sasselov | first29 = Dimitar | last30 = Seager | first30 = S. | last31 = Sharma | first31 = Sanjib | last32 = Shiao | first32 = Bernie | last33 = Sozzetti | first33 = Alessandro | last34 = Stello | first34 = Dennis | last35 = Vanderspek | first35 = Roland | last36 = Wallace | first36 = Geoff | last37 = Winn | first37 = Joshua N. | title = The Revised ''TESS'' Input Catalog and Candidate Target List | journal = The Astronomical Journal | date = 9 September 2019 | volume = 158 | issue = 4 | page = 138 | eissn = 1538-3881 | doi = 10.3847/1538-3881/ab3467 | bibcode = 2019AJ....158..138S | arxiv = 1905.10694 | s2cid = 166227927 | hdl = 1721.1/124721 | hdl-access = free | doi-access = free}}</ref>
<ref name = Anders2019>{{cite journal | display-authors = 1 | last1 = Anders | first1 = F. | last2 = Khalatyan | first2 = A. | last3 = Chiappini | first3 = C. | last4 = Queiroz | first4 = A. B. | last5 = Santiago | first5 = B. X. | last6 = Jordi | first6 = C. | last7 = Girardi | first7 = L. | last8 = Brown | first8 = A. G. A. | last9 = Matijevič | first9 = G. | last10 = Monari | first10 = G. | last11 = Cantat-Gaudin | first11 = T. | last12 = Weiler | first12 = M. | last13 = Khan | first13 = S. | last14 = Miglio | first14 = A. | last15 = Carrillo | first15 = I. | last16 = Romero-Gómez | first16 = M. | last17 = Minchev | first17 = I. | last18 = de Jong | first18 = R. S. | last19 = Antoja | first19 = T. | last20 = Ramos | first20 = P. | last21 = Steinmetz | first21 = M. | last22 = Enke | first22 = H. | title = Photo-astrometric distances, extinctions, and astrophysical parameters for ''Gaia'' DR2 stars brighter than ''G'' = 18 | journal = Astronomy & Astrophysics | date = August 2019 | volume = 628 | page = A94 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/201935765 | bibcode = 2019A&A...628A..94A | arxiv = 1904.11302 | s2cid = 131780028 | doi-access = free}}</ref>
<ref name = Kunzli1998>{{cite journal | last1=Kunzli | first1=M. | last2=North | first2=P. | title=Behaviour of calcium abundance in Am-Fm stars with evolution | journal = Astronomy and Astrophysics | volume = 330 | date=February 1998 | s2cid = 5679821 | pages= 651–658 | bibcode = 1998A&A...330..651K | arxiv = astro-ph/9710223 }}</ref>
<ref name = McDonald2017>{{cite journal | last1 = McDonald | first1 = I. | last2 = Zijlstra | first2 = A. A. | last3 = Watson | first3 = R. A. | title = Fundamental parameters and infrared excesses of Tycho–Gaia stars | journal = Monthly Notices of the Royal Astronomical Society | date = 15 June 2017 | volume = 471 | issue = 1 | pages = 770–791 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1093/mnras/stx1433 | bibcode = 2017MNRAS.471..770M | arxiv = 1706.02208 | s2cid = 73594365 | doi-access = free }}</ref>
<ref name = Gould1879>{{cite journal | last = Gould | first = Benjamin Apthorp | title = Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas | journal = Resultados del Observatorio Nacional Argentino | volume = 1 | bibcode = 1879RNAO....1.....G | year = 1878}}</ref>
<ref name = SIMBAD>{{Cite simbad|title = * 41 Sex|access-date = April 12, 2024}}</ref>
}} {{Stars of Sextans}}
[[Category:A-type main-sequence stars]] [[Category:Am stars]] [[Category:Spectroscopic binaries]] [[Category:Double stars]] [[Category:Sextans]] [[Category:Flamsteed objects|Sextantis, 41]] [[Category:Gould objects|Sextantis, 74]] [[Category:Durchmusterung objects|BD-08 03018]] [[Category:Henry Draper Catalogue objects|093903]] [[Category:Hipparcos objects|052980]] [[Category:Bright Star Catalogue objects|4237]]