View source for V373 Cassiopeiae

{{short description|Star system in the constellation Cassiopeia}}
{{Starbox begin
 | name = V373 Cassiopeiae
}}
{{Starbox image
| image = [[Image:V373 Cassiopeiae.jpg|300px]]
| caption = V373 Cassiopeiae (center) in optical light. The bright yellow star to the upper right of V373 Cas is [[Rho Cassiopeiae | ρ Cas]].
}}
{{Starbox observe
 | epoch       = J2000
 | constell    = [[Cassiopeia (constellation)|Cassiopeia]] 
 | ra          = {{RA|23|55|33.83878}}<ref name=GaiaDR2/>
 | dec         = {{DEC|+57|24|43.8057}}<ref name=GaiaDR2/>
 | appmag_v    = 6.03<ref name=Anderson2012/>
}}
{{Starbox character
 | class       = B0.5II + B4III/V<ref name=Anderson2012/>
 | b-v         = {{val|0.155|0.005}}<ref name=Anderson2012/>
 | u-b         =
 | variable    = Eclipsing?<ref name=Samus2017/>
}}
{{Starbox astrometry
 | radial_v    = {{val|−25.5|0.9}}<ref name=Wilson1953/>
 | prop_mo_ra  = −4.098<ref name=GaiaDR2/>
 | prop_mo_dec = −0.101<ref name=GaiaDR2/>
 | parallax    = 0.5267
 | p_error     = 0.0583
 | parallax_footnote = <ref name=GaiaDR2/>
 | absmag_v    = 
}}
{{Starbox orbit
 | reference   = <ref name=Hill_Fisher_1987/>
 | period_unitless = 13.41921&nbsp;days
 | axis        = <!--Semimajor axis (in arcseconds)-->
 | axis_unitless = <!--Semimajor axis (no units provided by template)-->
 | eccentricity = {{val|0.126|0.019}}
 | inclination = <!--Inclination (in degrees)-->
 | node        = <!--Longitude of node (in degrees)-->
 | periastron  = {{val|2420801.98|ul=JD|fmt=commas}}
 | periarg     = {{val|16|8}}
 | k1          = {{val|106.7|2.7}}
 | k2          = {{val|144.6|2.6}}
}}
{{Starbox detail
 | source      = <ref name=Lyubimkov_et_al_1998/>
 | component1  = A
 | mass        = {{val|18.6|2.4}}
 | radius      = 
 | luminosity  = 
 | gravity     = {{val|3.0|0.2}}
 | temperature = {{val|23200|600|fmt=commas}}
 | metal_fe    = 
 | rotation    = 
 | rotational_velocity = {{val|130|10}}
 | age_myr     = 7–8
 | component2  = B
 | mass2       = {{val|14.2|1.9}}
 | gravity2    = {{val|3.5|0.2}}
 | temperature2 = {{val|26800|1500|fmt=commas}}
 | rotational_velocity2 = {{val|60|5}} 
}}
{{Starbox catalog
 | names = {{odlist | V=V373 Cas | HR=9052 | BD=+56°3115 | HD=224151 | SAO=35899 | HIP=117957 | GC=33184 }}<ref name=SIMBAD/>
}}
{{Starbox reference 
 | Simbad = HD+224151
}}
{{Starbox end}}

'''V373 Cas''' is a [[binary star]] system in the northern [[constellation]] [[Cassiopeia (constellation)|Cassiopeia]]. It is a suspected [[eclipsing binary]] with an [[apparent visual magnitude]] that decreases from a baseline of 6.03 down to 6.13.<ref name=Samus2017/> The system is located at a distance of approximately 6,200&nbsp;[[light year]]s from the [[Sun]], but is drifting closer with a [[radial velocity]] of around −25.5&nbsp;km/s.<ref name=Wilson1953/>

[[File:V373CasLightCurve.png|thumb|left|A [[Photometric_system#Photometric_letters|visual band]] [[light curve]] for V373 Cassiopeiae, adapted from Lynds (1959)<ref name="Lynds"/>]]
The binary nature of this system was announced in 1912 by [[Walter Sydney Adams|Walter S. Adams]].<ref name=Lynds1959/> It is a double-lined [[spectroscopic binary]] with an [[orbital period]] of 13.4&nbsp;days and an [[orbital eccentricity|eccentricity]] of 0.13.<ref name=Hill_Fisher_1987/> The system was found to be [[variable star|variable]] in 1958 by [[Clarence Roger Lynds|C. Roger Lynds]], and the variability cycle was shown to be related to the orbital period.<ref name=Lynds1959/>  It has been described as a [[heartbeat star]] rather than an eclipsing system.  This is a type of pulsating star where the pulsations are induced by the tidal attraction of a close companion.<ref name=vsx/>

V373 Cas is composed of two hot blue-white giant stars that have exhausted their core hydrogen and expanded off the [[main sequence]]. Lyubimkov and colleagues analysed spectral and radial velocity to calculate that the stars were ~19 and ~15 times as massive as the Sun and the age of the system is around 7-8 million years old.<ref name=Lyubimkov_et_al_1998/> The primary component is the more evolved and now comes close to filling its [[Roche lobe]] when it is at periastron.<ref name=Karami_Mohebi_2009/>

==References==

{{reflist|refs=

<ref name=GaiaDR2>{{Cite Gaia DR2|1998132418058968064}}</ref>

<ref name=SIMBAD>{{cite simbad
 | title=V373 Cas | access-date=2020-11-19 }}</ref>

<ref name="Lynds">{{cite journal |last1=Lynds |first1=C. R. |title=The Light-Variation of HD 224151 |journal=Astrophysical Journal |date=September 1959 |volume=130 |pages=599–602 |doi=10.1086/146748 |bibcode=1959ApJ...130..599L |url=https://ui.adsabs.harvard.edu/abs/1959ApJ...130..599L |access-date=26 November 2021|doi-access=free }}</ref>

<ref name=Anderson2012>{{Cite journal
 | last1=Anderson | first1=E. | last2=Francis | first2=Ch.
 | title=XHIP: An extended hipparcos compilation
 | journal=Astronomy Letters
 | volume=38 | issue=5 | pages=331 | year=2012
 | bibcode=2012AstL...38..331A | arxiv=1108.4971
 | doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>

<ref name=Wilson1953>{{Cite journal
 | last=Wilson | first=R. E. | date=1953
 | title=General Catalogue of Stellar Radial Velocities
 | journal=Carnegie Institute Washington D.C. Publication
 | bibcode=1953GCRV..C......0W }}</ref>

<ref name=Samus2017>{{cite journal
 | display-authors=1 | last1=Samus | first1=N. N.
 | last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
 | last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
 | title=General Catalogue of Variable Stars
 | version=5.1 | journal=Astronomy Reports
 | year=2017 | volume=61 | issue=1 | pages=80–88
 | bibcode=2017ARep...61...80S  | s2cid=125853869
 | doi=10.1134/S1063772917010085 }}</ref>

<ref name=Hill_Fisher_1987>{{cite journal
 | title=Studies of early-type variable stars. IV. The orbit and physical dimensions for V373 Cas
 | last1=Hill | first1=G. | last2=Fisher | first2=W. A.
 | journal=Astronomy and Astrophysics
 | volume=171 | pages=123–130 | date=January 1987
 | bibcode=1987A&A...171..123H }}</ref>

<ref name=Lynds1959>{{cite journal
 | title=The Light-Variation of HD 224151
 | last=Lynds | first=C. R.
 | journal=Astrophysical Journal | volume=130 | page=599 | date=September 1959
 | doi=10.1086/146748 | bibcode=1959ApJ...130..599L | doi-access=free }}</ref>

<ref name=Karami_Mohebi_2009>{{cite journal
 | title=Velocity curve studies of spectroscopic binary stars V380 Cygni, V401 Cyg, V523 Cas, V373 Cas and V2388 Oph
 | last1=Karami | first1=K. | last2=Mohebi | first2=R.
 | journal=Journal of Astrophysics and Astronomy
 | volume=30 | issue=3–4 | pages=153–163 | date=December 2009
 | bibcode=2009JApA...30..153K | doi=10.1007/s12036-009-0010-0 | s2cid=122334785 }}</ref>

<ref name=Lyubimkov_et_al_1998>{{cite journal
 | title=The binary system V373 Cas: orbital elements, parameters of the components, and helium abundance
 | last1=Lyubimkov | first1=L. S. | last2=Rachkovskaya | first2=T. M.
 | last3=Rostopchin | first3=S. I. | last4=Tarasov | first4=A. E.
 | display-authors=1 | journal=Astronomy Reports
 | volume=42 | issue=3 | date=1998 | pages=312–321
 | bibcode=1998ARep...42..312L }}</ref>

<ref name=vsx>{{cite web |url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=6704 |title=V0373 Cas |access-date=2020-11-20 }}</ref>

}}

{{Stars of Cassiopeia}}
<!-- Properties -->
[[Category:B-type bright giants]]
[[Category:B-type giants]]
[[Category:Spectroscopic binaries]]
[[Category:Eclipsing binaries]]
<!-- Identifiers -->
[[Category:Cassiopeia (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|224151]]
[[Category:Hipparcos objects|117957]]
[[Category:Bright Star Catalogue objects|9052]]
[[Category:Objects with variable star designations|Cassiopeiae, V373]]