Astronomy:4 Cassiopeiae

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Short description: Star in the constellation Cassiopeia
4 Cassiopeiae
4CasLightCurve.png
A light curve for 4 Cassiopeiae, plotted from Hipparcos data.[1] The assumed period is from Koen and Eyer (2002).[2]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cassiopeia
Right ascension  23h 24m 50.26237s[3]
Declination +62° 16′ 58.1094″[3]
Apparent magnitude (V) 4.96[4] (4.95 – 5.00)[5]
Characteristics
Evolutionary stage AGB[6]
Spectral type M2− IIIab[4]
B−V color index 1.676±0.010[4]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)−38.99±0.23[7] km/s
Proper motion (μ) RA: +12.29[3] mas/yr
Dec.: −12.44[3] mas/yr
Parallax (π)4.15 ± 0.21[3] mas
Distance790 ± 40 ly
(240 ± 10 pc)
Absolute magnitude (MV)−1.94[4]
Details
Mass2.3[8] M☉
Radius78[9] R☉
Luminosity1,419[9] L☉
Temperature4,000[9] K
Other designations
4 Cas, NSV 14549, BD+61°2444, FK5 882, HD 220652, HIP 115590, HR 8904, SAO 20614, WDS J23248+6217A[10]
Database references
SIMBADdata
Messier 52, with the bright star 4 Cassiopeiae on the right (north) edge of the image

4 Cassiopeiae is a red giant in the northern constellation of Cassiopeia,[10] located approximately 790 light-years away from the Sun.[3] It is visible to the naked eye as a faint, red-hued star with a baseline apparent visual magnitude of 4.96.[4] At the distance of this system, its visual magnitude is diminished by an extinction of 0.56 due to interstellar dust.[11] This system is moving closer to the Earth with a heliocentric radial velocity of −39 km/s.[7]

An evolved red giant star, currently on the asymptotic giant branch,[6] 4 Cassiopeiae has a stellar classification of M2− IIIab.[4] It is a suspected variable star of unknown type with a brightness that varies from visual magnitude 4.95 down to 5.00.[5]

Multiple star catalogues list a number of companions to 4 Cassiopeiae, all unrelated stars at different distances.[12] As of 2011, the magnitude 9.88 component B lay at an angular separation of 96.10″ along a position angle of 226° relative to the primary. Components C, E, F, and G are all fainter and more than two arc-minutes from 4 Cassiopeiae, and components C and G are themselves close doubles.[13]

4 Cassiopeiae is 40' north of the open cluster Messier 52, near the constellation border with Cepheus, although it is not a member of the cluster.[14]

References

  1. ↑ Light Curve, ESA, https://www.cosmos.esa.int/web/hipparcos/java-tools/light-curve, retrieved 3 October 2022. 
  2. ↑ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society 331 (1): 45–59. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 van Leeuwen, F. (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. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  5. ↑ 5.0 5.1 5.2 Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017), "General catalogue of variable stars", Astronomy Reports, 5.1 61 (1): 80, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S. 
  6. ↑ 6.0 6.1 Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal 104: 275, doi:10.1086/116239, Bibcode: 1992AJ....104..275E. 
  7. ↑ 7.0 7.1 Famaey, B. et al. (2009), "Spectroscopic binaries among Hipparcos M giants. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics 498 (2): 627–640, doi:10.1051/0004-6361/200810698, Bibcode: 2009A&A...498..627F. 
  8. ↑ Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly". A&A 623: 623. doi:10.1051/0004-6361/201834371. Bibcode: 2019A&A...623A..72K. 
  9. ↑ 9.0 9.1 9.2 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  10. ↑ 10.0 10.1 "4 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=4+Cas. 
  11. ↑ Famaey, B. et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430 (1): 165–186, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F. 
  12. ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 
  13. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M. 
  14. ↑ Baumgardt, H.; Dettbarn, C.; Wielen, R. (2000). "Absolute proper motions of open clusters. I. Observational data". Astronomy and Astrophysics Supplement Series 146 (2): 251. doi:10.1051/aas:2000362. Bibcode: 2000A&AS..146..251B. 



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