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V373 Cassiopeiae

V373 Cassiopeiae (center) in optical light. The bright yellow star to the upper right of V373 Cas is ρ Cas.
Observation data Epoch J2000      Equinox J2000
Constellation	Cassiopeia
Right ascension	23 55 33.83878
Declination	+57° 24′ 43.8057″
Apparent magnitude (V)	6.03
Characteristics
Spectral type	B0.5II + B4III/V
B−V color index	0.155±0.005
Variable type	Eclipsing?
Astrometry
Radial velocity (Rv)	−25.5±0.9 km/s
Proper motion (μ)	RA: −4.098 mas/yr Dec.: −0.101 mas/yr
Parallax (π)	0.5267 ± 0.0583 mas
Distance	approx. 6,200 ly (approx. 1,900 pc)
Orbit
Period (P)	13.41921 days
Eccentricity (e)	0.126±0.019
Periastron epoch (T)	2,420,801.98 JD
Argument of periastron (ω) (secondary)	16±8°
Semi-amplitude (K1) (primary)	106.7±2.7 km/s
Semi-amplitude (K2) (secondary)	144.6±2.6 km/s
Details
A
Mass	18.6±2.4 M☉
Surface gravity (log g)	3.0±0.2 cgs
Temperature	23,200±600 K
Rotational velocity (v sin i)	130±10 km/s
Age	7–8 Myr
B
Mass	14.2±1.9 M☉
Surface gravity (log g)	3.5±0.2 cgs
Temperature	26,800±1,500 K
Rotational velocity (v sin i)	60±5 km/s
Other designations
V373 Cas, BD+56°3115, GC 33184, HD 224151, HIP 117957, HR 9052, SAO 35899
Database references
SIMBAD	data

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 6,200 light years from the Sun, but is drifting closer with a radial velocity of around −25.5 km/s.

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

1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
3. ^ Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
4. ^ Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
5. ^ Hill, G.; Fisher, W. A. (January 1987). "Studies of early-type variable stars. IV. The orbit and physical dimensions for V373 Cas". Astronomy and Astrophysics. 171: 123–130. Bibcode:1987A&A...171..123H.
6. ^ Lyubimkov, L. S.; et al. (1998). "The binary system V373 Cas: orbital elements, parameters of the components, and helium abundance". Astronomy Reports. 42 (3): 312–321. Bibcode:1998ARep...42..312L.
7. "V373 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-19.
8. Lynds, C. R. (September 1959). "The Light-Variation of HD 224151". Astrophysical Journal. 130: 599–602. Bibcode:1959ApJ...130..599L. doi:10.1086/146748.
9. ^ Lynds, C. R. (September 1959). "The Light-Variation of HD 224151". Astrophysical Journal. 130: 599. Bibcode:1959ApJ...130..599L. doi:10.1086/146748.
10. "V0373 Cas". Retrieved 2020-11-20.
11. Karami, K.; Mohebi, R. (December 2009). "Velocity curve studies of spectroscopic binary stars V380 Cygni, V401 Cyg, V523 Cas, V373 Cas and V2388 Oph". Journal of Astrophysics and Astronomy. 30 (3–4): 153–163. Bibcode:2009JApA...30..153K. doi:10.1007/s12036-009-0010-0. S2CID 122334785.

v t e Constellation of Cassiopeia
List of stars in Cassiopeia Cassiopeia in Chinese astronomy
Stars	Bayer α (Schedar) β (Caph) γ (Navi/Tsih) δ (Ruchbah) ε (Segin) ζ (Fulu) η (Achird) θ (Marfak) ι κ λ μ ν ξ ο π ρ σ τ υ υ (Castula) φ χ ψ ω Flamsteed 1 2 4 6 9 10 12 42 47 48 (A) 49 50 54 Variable R S TZ WZ YZ (21) AO AR PZ V373 V509 V547 V669 V705 V762 V863 V773 V987 V1022 V1405 HR 5 91 144 196 244 273 297 743 932 8832 8853 8881 HD 861 7924 7977 15558 17156 (Nushagak) 240210 240237 240429 240430 Other BD+60°2522 Gliese 49 IRAS 23304+6147 LS I +61 303 PSR J0205+6449 Tycho G 4U 0142+61 WR 2 WR 3
Exoplanets HD 7924 b HD 17156 b HD 219134 b c d e (h) f g HD 240210 b HD 240237 b
Star clusters Messier 52 Messier 103 NGC 103 NGC 110 NGC 129 NGC 133 NGC 136 NGC 146 NGC 189 NGC 225 NGC 358 NGC 366 NGC 381 NGC 433 NGC 436 NGC 457 NGC 559 NGC 637 NGC 654 NGC 659 NGC 663 NGC 1027 NGC 7789 NGC 7790 Trumpler 3
Nebulae	NGC 281 7635 Other 3C 58 Cassiopeia A Heart Nebula IC 289 IC 1805 KjPn 8 LBN 114.55+00.22 Sh 2-185 Westerhout 5
Galaxies	NGC 147 185 278 Other Andromeda VII 3C 20 3C 35 Dwingeloo 1 Dwingeloo 2 MB 3 IC 10 Maffei 1 Maffei 2 QSO B0153+744
Astronomical events SN 1181 SN 1572 (B)
Category

• 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