V373 Cassiopeiae

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title: "V373 Cassiopeiae" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["b-type-bright-giants", "b-type-giants", "spectroscopic-binaries", "eclipsing-binaries", "cassiopeia-(constellation)", "durchmusterung-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects", "objects-with-variable-star-designations"] description: "Star system in the constellation Cassiopeia" topic_path: "general/b-type-bright-giants" source: "https://en.wikipedia.org/wiki/V373_Cassiopeiae" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star system in the constellation Cassiopeia ::

| name = V373 Cassiopeiae | 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 ρ Cas. | epoch = J2000 | constell = Cassiopeia | ra = | dec = | appmag_v = 5.96 - 6.06 | class = B0.5II + B4III/V | b-v = | u-b = | variable = Eclipsing? | radial_v = | prop_mo_ra = −4.060 | prop_mo_dec = −0.020 | parallax = 0.5019 | p_error = 0.0330 | parallax_footnote = | absmag_v = | reference = | period_unitless = 13.41921 days | axis = | axis_unitless = | eccentricity = | inclination = | node = | periastron = | periarg = | k1 = | k2 = | source = | component1 = A | mass = | radius = | luminosity = | gravity = | temperature = | metal_fe = | rotation = | rotational_velocity = | age_myr = 7–8 | component2 = B | mass2 = | gravity2 = | temperature2 = | rotational_velocity2 = | names = | Simbad = HD+224151

V373 Cas is a binary star system in the northern 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. The system is located at a distance of approximately 6,500 light years from the Sun, but is drifting closer with a radial velocity of around −25.5 km/s. It is faintly visible to the naked eye under very good observing conditions.

::figure[src="https://upload.wikimedia.org/wikipedia/commons/7/7f/V373CasLightCurve.png" caption="visual band]] [[light curve]] for V373 Cassiopeiae, adapted from Lynds (1959)"] ::

The binary nature of this system was announced in 1912 by Walter S. Adams. It is a double-lined spectroscopic binary with an orbital period of 13.4 days and an eccentricity of 0.13. The system was found to be variable in 1958 by C. Roger Lynds, and the variability cycle was shown to be related to the orbital period. 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.

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. The primary component is the more evolved and now comes close to filling its Roche lobe when it is at periastron.

References

| title=V373 Cas | access-date=2020-11-19 }}

| 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 }}

| 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 }}

| 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 }}

| 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 }}

| 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 }}

| 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 }}

| 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 }}

References

1. {{Cite Gaia DR3. 1998132418058968064
2. (September 1959). "The Light-Variation of HD 224151". Astrophysical Journal.
3. "V0373 Cas".

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