YZ Cassiopeiae

YZ Cas


Location of YZ Cassiopeiae (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
A
Right ascension 00h 45m 39.0777s[1]
Declination +74° 59′ 17.063″[1]
Apparent magnitude (V) 5.653[2]
B
Right ascension 00h 45m 42,1503s[3]
Declination +74° 58′ 43.242″[3]
Apparent magnitude (V) 11.23[4]
Characteristics
A
Spectral type A2IV[5] (A1Vm + F2V[6])
U−B color index +0.07[4]
B−V color index +0.05[4]
Variable type Algol[7]
B
Spectral type G0V[8]
U−B color index +0.64[4]
B−V color index +0.94[4]
Astrometry
Radial velocity (Rv)+8.90±0.4[9] km/s
Proper motion (μ) RA: −15.07[1] mas/yr
Dec.: −22.17[1] mas/yr
Parallax (π)11.24 ± 0.55[1] mas
Distance103.8[10] pc
Absolute magnitude (MV)+0.251[6]
Orbit[11]
CompanionTYC 4307-2168-1
Period (P)86 580 yr
Orbit
PrimaryAa
CompanionAb
Period (P)4.467 days[10]
Semi-major axis (a)17.47 R☉[12]
Eccentricity (e)0.0[10]
Inclination (i)88.332[10]°
Details
Aa
Mass2.308[12] M☉
Radius2.547[12] R☉
Luminosity41.69[12] L☉
Surface gravity (log g)3.988[10] cgs
Temperature9,200[12] K
Rotational velocity (v sin i)29.2[10] km/s
Ab
Mass1.325[13] M☉
Radius1.359[12] R☉
Luminosity3.34[12] L☉
Surface gravity (log g)4.311[10] cgs
Temperature6.890[13] K
Rotational velocity (v sin i)15.0[10] km/s
Age490 - 550[10] Myr
Other designations
21 Cassiopeiae, HR 192, BD+74 27, HD 4161, SAO 4216, HIP 3572, GC 891, ADS 624 A, CCDM J00457+7459
Database references
SIMBADdata

YZ Cassiopeiae (21 Cas) is a star system 103.8 parsecs (339 ly) away from Earth, in the constellation Cassiopeia. It comprises three stars: an eclipsing Algol-type binary and a visually fainter star about 3000 AU distant.[11]

The primary star in the YZ Cassiopeiae system is a white subgiant (main sequence) star of spectral type A1Vm and 2.31 solar masses[11] (M☉) with a less massive main sequence dwarf star of type F2V[2] and 1.35 M☉.[11] The apparent magnitude of the eclipsing binary varies from 5.65 to 6.05[2] with a period of 4.4672 days.[11] Combined, they appear to have a spectral type of A2IV.[11]

The binary has a dimmer (magnitude 9.7 according to Norton,[14] or 10.5 by SIMBAD) companion of 0.8 M☉[11] orbiting with a period of about 86 580 years.[11]

References

  1. 1 2 3 4 5 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 3 Jerzy M. Kreiner, Chun-Hwey Kim, Il-Seong Nha. YZ CAS: Atlas of O-C Diagrams of Eclipsing Binary Stars
  3. 1 2 Hog, E.; Kuzmin, A.; Bastian, U.; Fabricius, C.; Kuimov, K.; Lindegren, L.; Makarov, V. V.; Roeser, S. (1998). "The TYCHO Reference Catalogue". Astronomy and Astrophysics. 335: L65. Bibcode:1998A&A...335L..65H.
  4. 1 2 3 4 5 Eggen, O. J. (1963). "Three-color photometry of the components in 228 wide double and multiple systems". Astronomical Journal. 68: 483. Bibcode:1963AJ.....68..483E. doi:10.1086/109000.
  5. ↑ Grenier, S.; Baylac, M.-O.; Rolland, L.; Burnage, R.; Arenou, F.; Briot, D.; Delmas, F.; Duflot, M.; Genty, V.; Gómez, A. E.; Halbwachs, J.-L.; Marouard, M.; Oblak, E.; Sellier, A. (1999). "Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS". Astronomy and Astrophysics Supplement. 137 (3): 451. Bibcode:1999A&AS..137..451G. doi:10.1051/aas:1999489.
  6. 1 2 Bilir, S.; Ak, T.; Soydugan, E.; Soydugan, F.; Yaz, E.; Filiz Ak, N.; Eker, Z.; Demircan, O.; Helvaci, M. (2008). "New absolute magnitude calibrations for detached binaries". Astronomische Nachrichten. 329 (8): 835. arXiv:0806.1290Freely accessible. Bibcode:2008AN....329..835B. doi:10.1002/asna.200811002.
  7. ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  8. ↑ Tamazian, V. S.; Docobo, J. A.; Chavushyan, V. H.; Vlasyuk, V. V. (1997). "Optical Spectra of Some Visual Binaries with Variable Component". Visual Double Stars : Formation. Astrophysics and Space Science Library. 223: 27. Bibcode:1997ASSL..223...27T. doi:10.1007/978-94-009-1477-3_4. ISBN 978-94-010-7161-1.
  9. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  10. 1 2 3 4 5 6 7 8 9 Pavlovski, K.; Southworth, J.; Kolbas, V.; Smalley, B. (2014). "Absolute dimensions of detached eclipsing binaries - III. The metallic-lined system YZ Cassiopeiae". Monthly Notices of the Royal Astronomical Society. 438: 590. arXiv:1311.3482Freely accessible. Bibcode:2014MNRAS.438..590P. doi:10.1093/mnras/stt2229.
  11. 1 2 3 4 5 6 7 8 Tokovinin 1997-1999. J/A+AS/124/75. Multiple star catalogue (MSC)
  12. 1 2 3 4 5 6 7 Eker, Z.; Soydugan, F.; Soydugan, E.; Bilir, S.; Yaz Gökçe, E.; Steer, I.; Tüysüz, M.; Şenyüz, T.; Demircan, O. (2015). "Main-Sequence Effective Temperatures from a Revised Mass-Luminosity Relation Based on Accurate Properties". The Astronomical Journal. 149 (4): 131. Bibcode:2015AJ....149..131E. doi:10.1088/0004-6256/149/4/131.
  13. 1 2 Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015). "Bayesian mass and age estimates for transiting exoplanet host stars". Astronomy & Astrophysics. 575: A36. arXiv:1412.7891Freely accessible. Bibcode:2015A&A...575A..36M. doi:10.1051/0004-6361/201425331.
  14. ↑ Norton, Arthur P. (1973). Norton's Star Atlas. p. 118. ISBN 0-85248-900-5.

Coordinates: 00h 45m 39.0777s, +74° 59′ 17.063″

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