Astronomy:YZ Cassiopeiae

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Short description: Triple star system in the constellation Cassiopeia
YZ Cas
Cassiopeia constellation map.svg
Red circle.svg
Location of YZ Cassiopeiae (circled)
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|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 F2V[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[8] pc
Absolute magnitude (MV)+0.251[6]
Orbit[10]
CompanionTYC 4307-2168-1
Period (P)86 580 yr
Orbit[8]
PrimaryAa
CompanionAb
Period (P)4.467 days
Semi-major axis (a)17.47 R☉[11]
Eccentricity (e)0.0
Inclination (i)88.332°
Details
Aa
Mass2.308[11] M☉
Radius2.547[11] R☉
Luminosity41.69[11] L☉
Surface gravity (log g)3.988[8] cgs
Temperature9,200[11] K
Rotational velocity (v sin i)29.2[8] km/s
Ab
Mass1.325[12] M☉
Radius1.359[11] R☉
Luminosity3.34[11] L☉
Surface gravity (log g)4.311[8] cgs
Temperature6,890[12] K
Rotational velocity (v sin i)15.0[8] km/s
Age490 - 550[8] Myr
Other designations
21 Cassiopeiae, HR 192, BD+74 27, HD 4161, SAO 4216, HIP 3572, GC 891, ADS 624 A, CCDM J00457+7459[13]
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.[10]

A light curve for YZ Cassiopeiae, plotted from TESS data[14]

The primary star in the YZ Cassiopeiae system is a white subgiant (main sequence) star of spectral type A1Vm and 2.31 solar masses[10] (M☉) with a less massive main sequence dwarf star of type F2V[2] and 1.35 M☉.[10] The apparent magnitude of the eclipsing binary varies from 5.65 to 6.05[2] with a period of 4.4672 days.[10] Combined, they appear to have a spectral type of A2IV.[10]

The binary has a dimmer (magnitude 9.7 according to Norton,[15] or 10.5 by SIMBAD) companion of 0.8 M☉[10] orbiting with a period of about 86 580 years.[10]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 Jerzy M. Kreiner, Chun-Hwey Kim, Il-Seong Nha. YZ CAS: Atlas of O-C Diagrams of Eclipsing Binary Stars
  3. ↑ 3.0 3.1 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. ↑ 4.0 4.1 4.2 4.3 4.4 Eggen, O. J. (1963). "Three-color photometry of the components in 228 wide double and multiple systems". Astronomical Journal 68: 483. doi:10.1086/109000. Bibcode: 1963AJ.....68..483E. 
  5. ↑ Grenier, S.; Baylac, M.-O.; Rolland, L.; Burnage, R.; Arenou, F.; Briot, D.; Delmas, F.; Duflot, M. et al. (1999). "Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS". Astronomy and Astrophysics Supplement 137 (3): 451. doi:10.1051/aas:1999489. Bibcode: 1999A&AS..137..451G. https://hal.archives-ouvertes.fr/hal-02053966/file/Grenier%20et%20al.%20-%201999%20-%20Radial%20velocities.%20Measurements%20of%202800%20B2-F5%20star.pdf. 
  6. ↑ 6.0 6.1 Bilir, S.; Ak, T.; Soydugan, E.; Soydugan, F.; Yaz, E.; Filiz Ak, N.; Eker, Z.; Demircan, O. et al. (2008). "New absolute magnitude calibrations for detached binaries". Astronomische Nachrichten 329 (8): 835. doi:10.1002/asna.200811002. Bibcode: 2008AN....329..835B. 
  7. ↑ Samus, N. N. 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. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 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 (1): 590–603. doi:10.1093/mnras/stt2229. Bibcode: 2014MNRAS.438..590P. 
  9. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 10.6 10.7 Tokovinin 1997-1999. J/A+AS/124/75. Multiple star catalogue (MSC)
  11. ↑ 11.0 11.1 11.2 11.3 11.4 11.5 11.6 Eker, Z.; Soydugan, F.; Soydugan, E.; Bilir, S.; Yaz Gökçe, E.; Steer, I.; Tüysüz, M.; Şenyüz, T. et al. (2015). "Main-Sequence Effective Temperatures from a Revised Mass-Luminosity Relation Based on Accurate Properties". The Astronomical Journal 149 (4): 131. doi:10.1088/0004-6256/149/4/131. Bibcode: 2015AJ....149..131E. 
  12. ↑ 12.0 12.1 Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015). "Bayesian mass and age estimates for transiting exoplanet host stars". Astronomy & Astrophysics 575: A36. doi:10.1051/0004-6361/201425331. Bibcode: 2015A&A...575A..36M. 
  13. ↑ "V* YZ Cas". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+YZ+Cas. 
  14. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  15. ↑ Norton, Arthur P. (1973). Norton's Star Atlas. p. 118. ISBN 0-85248-900-5. https://archive.org/details/nortonsstaratlas0000nort. 

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



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