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V509 Cassiopeiae

V509 Cassiopeiae

The visual band light curve for V509 Cassiopeiae, adapted from Percy and Zsoldos (1992)[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 23h 00m 05.1s[2]
Declination +56° 56′ 43″[2]
Apparent magnitude (V) +4.6 - +6.1[3]
Characteristics
Spectral type G0Ia0 (K5Ia0 - A6Ia+[4])[5]
U−B color index +1.33[6]
B−V color index +1.0 - +1.7[5]
Variable type SRd[3]
Astrometry
Radial velocity (Rv)−50.20[7] km/s
Proper motion (μ) RA: −2.787[8] mas/yr
Dec.: −2.054[8] mas/yr
Parallax (π)0.2078 ± 0.0899 mas[8]
Distance4,810±430[9] pc
Absolute magnitude (MV)−8.6 (variable)[5]
Details
Mass19.6 or 10.6[5][a] M☉
Radius677 (mean), 390 – 910[5][b] R☉
Luminosity269,000[9]
178,000 – 400,000[10][c]
400,000[5] L☉
Temperature5,011 (mean);[d] 4,000 – 8,000[5] K
Metallicity [Fe/H]0.0[11] dex
Other designations
HR 8752, HD 217476, FK5 3839, HIP 113561, SAO 35039, AAVSO 2255+56
Database references
SIMBADdata

V509 Cassiopeiae (V509 Cas or HR 8752) is one of two yellow hypergiant stars found in the constellation Cassiopeia, which also contains Rho Cassiopeiae.

HR 8752 is around 15,700 light-years from Earth. It has an apparent magnitude that has varied from below +6 in historical times to a peak of +4.6 and now around +5.3 and is classified as a semiregular variable star of type SRd. It is undergoing strong mass loss as part of its rapid evolution and has recently passed partway through the yellow evolutionary void by ejecting around a solar mass of material in 20 years.[5]

A hot main sequence companion (B1V) was described in 1978 on the basis of a colour excess in the ultraviolet.

  1. ^ Cite error: The named reference Percy was invoked but never defined (see the help page).
  2. ^ a b Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  3. ^ a b Cite error: The named reference zsoldos was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference lobel was invoked but never defined (see the help page).
  5. ^ a b c d e f g h Nieuwenhuijzen, H.; De Jager, C.; Kolka, I.; Israelian, G.; Lobel, A.; Zsoldos, E.; Maeder, A.; Meynet, G. (2012). "The hypergiant HR 8752 evolving through the yellow evolutionary void" (PDF). Astronomy & Astrophysics. 546: A105. Bibcode:2012A&A...546A.105N. doi:10.1051/0004-6361/201117166.
  6. ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
  7. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  8. ^ a b c 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.
  9. ^ a b Klochkova, V. G. (2019). "Unity and Diversity of Yellow Hypergiants Family". Astrophysical Bulletin. 74 (4): 475–489. arXiv:1911.09387. Bibcode:2019AstBu..74..475K. doi:10.1134/S1990341319040138. S2CID 208202411.
  10. ^ van Genderen, A. M.; Lobel, A.; Nieuwenhuijzen, H.; Henry, G. W.; De Jager, C.; Blown, E.; Di Scala, G.; Van Ballegoij, E. J. (2019). "Pulsations, eruptions, and evolution of four yellow hypergiants". Astronomy and Astrophysics. 631: A48. arXiv:1910.02460. Bibcode:2019A&A...631A..48V. doi:10.1051/0004-6361/201834358. S2CID 203836020.
  11. ^ Fry, M. A.; Aller, L. H. (1975). "A comparison of galactic and Large Magellanic Cloud G-type supergiants by a method of spectrum synthesis". Astrophysical Journal Supplement Series. 29: 55. Bibcode:1975ApJS...29...55F. doi:10.1086/190332.


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