DY Persei

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DY Per

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 02h 35m 17.132s[1]
Declination +56° 08′ 44.68″[1]
Apparent magnitude (V) 11.09[1](v)
Spectral type C5,4pJ:[2]
B−V color index 1.79[1]
V−R color index 1.12[1]
J−H color index 0.185[3]
J−K color index 1.963[3]
Variable type R CrB[4]
Radial velocity (Rv) -38[5] km/s
Distance 1,500[6] pc
Absolute magnitude (MV) ~ -2[6]
Surface gravity (log g) 0.0[7] cgs
Temperature 2,900-3,100[7] K
Metallicity -2.0 - -0.5[7]
Other designations
DY Persei, DY Per, 2MASS J02351713+5608446, AAVSO 0228+55, IRAS 02316+5555
Database references

DY Persei is a variable star in the Perseus constellation, being a prototype star to the very rare type of DY Persei variables, that pulsate like red variables, but also fade from sight like R Coronae Borealis variables.[8] DY Persei itself is an 11th magnitude carbon star that is too dim to see through binoculars. At its faintest it drops below 18th magnitude.[6]


  1. ^ a b c d e Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. Bibcode:2000A&A...355L..27H. 
  2. ^ Dean, C. A. (1976). "Kinematic properties of the carbon stars". The Astronomical Journal 81: 364. Bibcode:1976AJ.....81..364D. doi:10.1086/111895. 
  3. ^ a b Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: 2003yCat.2246....0C 2246: 0. Bibcode:2003yCat.2246....0C. 
  4. ^ Mattei, Janet A.; Waagen, Elizabeth O.; Foster, E. Grant (1991). "R Coronae Borealis light curves 1843-1990". AAVSO Monograph. Bibcode:1991rcbl.book.....M. 
  5. ^ Demers, S.; Battinelli, P. (2007). "C stars as kinematic probes of the Milky Way disk from 9 to 15 kpc". Astronomy and Astrophysics 473: 143. Bibcode:2007A&A...473..143D. doi:10.1051/0004-6361:20077691. 
  6. ^ a b c Začs, L.; Mondal, S.; Chen, W. P.; Pugach, A. F.; Musaev, F. A.; Alksnis, O. (2007). "A comprehensive analysis of the cool RCB star DY Persei". Astronomy and Astrophysics 472: 247. Bibcode:2007A&A...472..247Z. doi:10.1051/0004-6361:20066923. 
  7. ^ a b c Yakovina, L. A.; Pugach, A. F.; Pavlenko, Ya. V. (2009). "DY Persei, the coolest metal-poor R CrB carbon star". Astronomy Reports 53 (3): 187. Bibcode:10.1134/S1063772909030019. doi:10.1134/S1063772909030019. 
  8. ^ Alcock, C.; Allsman, R. A.; Alves, D. R.; Axelrod, T. S.; Becker, A.; Bennett, D. P.; Clayton, G. C.; Cook, K. H.; Dalal, N. (2001). "The MACHO Project LMC Variable Star Inventory. X. The R Coronae Borealis Stars". The Astrophysical Journal 554 (1): 298–315. arXiv:astro-ph/0102262. Bibcode:2001ApJ...554..298A. doi:10.1086/321369.