Astronomy:V762 Cassiopeiae

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Short description: Red supergiant star in the constellation Cassiopeia
V762 Cassiopeiae
This is a map that pinpoints V762 Cassiopeiae location.
The location of V762 Cassiopeiae
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cassiopeia[1]
Right ascension  01h 16m 11.902s[2]
Declination +71° 44′ 37.83″[2]
Apparent magnitude (V) 5.82 – 5.95[3]
Characteristics
Evolutionary stage RSG[4] or AGB[5]
Spectral type K5I[4][3] or M3II[6]
Variable type Semi-regular variable[7]
Astrometry
Radial velocity (Rv)−21.37±0.91[2] km/s
Proper motion (μ) RA: −1.658[2] mas/yr
Dec.: +1.791[2] mas/yr
Parallax (π)1.3148 ± 0.0693[2] mas
Distance2,500 ± 100 ly
(760 ± 40 pc)
Details
Mass16.9±2.2[8] M☉
Radius265.7[5] R☉
Luminosity14,970[5] L☉
Surface gravity (log g)0.90[9] cgs
Temperature3,869±145[4][5] K
Metallicity [Fe/H]−0.18[9] dex
Age10.0±1.6[8] Myr
Other designations
V762 Cas, BD+70 90, HD 7389, HIP 5926, HR 365, SAO 4358, TYC 4305-2038-1[10]
Database references
SIMBADdata

V762 Cassiopeiae is a star in the constellation of Cassiopeia. Its apparent magnitude vary between 5.82 and 5.95, which makes it faintly visible to the naked eye under dark skies. Parallax measurements give it a distance of 2,500 light-years.

Characteristics

A light curve for V762 Cassiopeiae, plotted from Hipparcos data[11]

V762 Cassiopeiae has a spectral classification of K5 I,[4] suggesting that it is an evolved K-type red supergiant star. Other catalogues have published spectral types of K4,[12] M,[13] and M3II.[6] The Bright Star Catalogue assigned a class of K1V,[14] which originated from one of the earliest observations of this star[15] and was adopted by the General Catalogue of Variable Stars.[14] Recent estimates of the star's physical properties, considering its distance in excess of a thousand light-years,[2] found that it is a red supergiant[4] or asymptotic giant branch star.[5]

At an estimated to be ten million years old, has around 16.9 times the Sun's mass[8] and has expanded to 266 times the Sun's radius. It radiates 15,000 times the solar luminosity from its photosphere at an effective temperature of 3,869 K,[5] which gives it an orange-red hue.[16] Parallax measurements from the Gaia spacecraft show that V762 Cassiopeiae is located about 2,500 light-years away.[2] At the estimated distance, V762 Cassiopeiae's apparent brightness is diminished by 1.04 magnitudes due to interstellar extinction.[5]

Hipparcos satellite data showed that the star is variable, and because of that it was given the variable-star designation V762 Cassiopeiae, in 1999.[17] The variability amplitude in visible light is only about 0.1 magnitudes.[3] The star was catalogued as a semi-regular variable.[7]

Distance and titleholding

Some websites claim V762 Cassiopeiae is the "farthest star visible to the naked eye", at a distance of 16,300 light-years.[18][19] This distance is apparently based on the first Hipparcos published parallax of 0.22±0.59 mas, approximately 5,000 pc or 16,300 light years. However, given the statistical margin of error, the distance is meaningless. The Hipparcos new reduction gives a parallax of 1.18±0.45 mas, corresponding to a distance of about 2,800 light-years,[20] and Gaia DR3 lists a parallax of 1.3148±0.0693 mas, corresponding to a distance of about 2,500 light-years.[2]

References

  1. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 "V0762 Cas". AAVSO. https://www.aavso.org/vsx/index.php?view=detail.top&oid=7093. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Messineo, M.; Brown, A. G. A. (2019-07-01). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal 158 (1): 20. doi:10.3847/1538-3881/ab1cbd. ISSN 0004-6256. Bibcode: 2019AJ....158...20M.  V762 Cassiopeiae's database entry at VizieR.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Healy, Sarah; Horiuchi, Shunsaku; Molla, Marta Colomer; Milisavljevic, Dan; Tseng, Jeff; Bergin, Faith; Weil, Kathryn; Tanaka, Masaomi (2024-03-23). "Red Supergiant Candidates for Multimessenger Monitoring of the Next Galactic Supernova". Monthly Notices of the Royal Astronomical Society 529 (4): 3630–3650. doi:10.1093/mnras/stae738. ISSN 0035-8711. Bibcode: 2024MNRAS.529.3630H. 
  6. ↑ 6.0 6.1 Pickles, A.; Depagne, É. (2010). "All-Sky Spectrally Matched UBVRI - ZY and u‧ g‧ r‧ i‧ z‧ Magnitudes for Stars in the Tycho2 Catalog". Publications of the Astronomical Society of the Pacific 122 (898): 1437. doi:10.1086/657947. Bibcode: 2010PASP..122.1437P. 
  7. ↑ 7.0 7.1 ESA (1997). "The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission" (in en). ESA Special Publication 1200. ISSN 1609-042X. Bibcode: 1997ESASP1200.....E.  V762 Cas' database entry at VizieR.
  8. ↑ 8.0 8.1 8.2 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011-01-01). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society 410 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. Bibcode: 2011MNRAS.410..190T.  V762 Cassiopeiae's database entry at VizieR.
  9. ↑ 9.0 9.1 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  10. ↑ "HD 7389". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+7389. 
  11. ↑ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series (Noordwijk, Netherlands: ESA Publications Division) 1200. ISBN 9290923997. Bibcode: 1997ESASP1200.....E. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. Retrieved 15 October 2022. 
  12. ↑ Duflot, M.; Figon, P.; Meyssonnier, N. (1995). "Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue". Astronomy and Astrophysics Supplement Series 114: 269. Bibcode: 1995A&AS..114..269D. 
  13. ↑ Platais, I.; Pourbaix, D.; Jorissen, A.; Makarov, V. V.; Berdnikov, L. N.; Samus, N. N.; Lloyd Evans, T.; Lebzelter, T. et al. (2003). "Hipparcos red stars in the HpVT2 and VIC systems". Astronomy and Astrophysics 397: 997. doi:10.1051/0004-6361:20021589. Bibcode: 2003A&A...397..997P. 
  14. ↑ 14.0 14.1 Hoffleit, Dorrit; Jaschek, Carlos (1991). The Bright star catalogue. Bibcode: 1991bsc..book.....H. 
  15. ↑ Appenzeller, Immo (1967). "MK Spectral Types for 185 Bright Stars". Publications of the Astronomical Society of the Pacific 79 (467): 102. doi:10.1086/128449. Bibcode: 1967PASP...79..102A. 
  16. ↑ "The Colour of Stars". 6 March 2024. https://www.atnf.csiro.au/outreach/education/senior/astrophysics/photometry_colour.html. 
  17. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars 4659: 1. Bibcode: 1999IBVS.4659....1K. https://ibvs.konkoly.hu/pub/ibvs/4601/4659.pdf. Retrieved 8 May 2024. 
  18. ↑ "Farthest Star You Can See With The Unaided Eye" (in en-US). 2021-03-26. https://cosmoknowledge.com/farthest-star-you-can-see-with-the-unaided-eye/. 
  19. ↑ "How Far Back In Time Can We See With Our Naked Eye?" (in en-US). 2021-05-17. https://bigthink.com/starts-with-a-bang/how-far-back-in-time-can-we-see-with-our-naked-eye/. 
  20. ↑ "HIP 5926". Centre de données astronomiques de Strasbourg. https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ6617bbac3205f9&-out.add=.&-source=I/345/gaia2&-c=019.04956866252%20%2b71.74384808486,eq=ICRS,rs=2&-out.orig=o. 



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