Astronomy:Rotating ellipsoidal variable
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Rotating ellipsoidal variables are a class of close binary variable star systems whose components are ellipsoidal. They are not eclipsing, but fluctuations in apparent magnitude occur due to changes in the amount of light emitting area visible to the observer. Typical brightness fluctuations do not exceed 0.1 magnitudes.[2]
The brightest rotating ellipsoidal variable is Spica (α Virginis).[3]
List of variables
| Designation (name) | Constellation | Discovery | Apparent magnitude (Maximum) | Apparent magnitude (Minimum) | Range of magnitude | Spectral type | Comment |
|---|---|---|---|---|---|---|---|
| Spica (α Virginis) | Virgo | Ruban et al. (2006) | 0.97 | 1.04 | 0.07 | B1 III-IV + B2 V | Brightest member; binary |
| α Trianguli (Mothallah) | Triangulum | Ruban et al. (2006) | 3.52 (Hp) | 3.53 (Hp) | 0.01 | F5 III + M | |
| π5 Orionis | Orion | Ruban et al. (2006) | 3.66 | 3.73 | 0.07 | B2 III + B6 V | |
| b Persei | Perseus | Ruban et al. (2006) | 0.97 | 1.04 | 0.07 | A2 V | Brightest member; binary |
| 68 Cygni (V1809 Cyg) | Cygnus | 4.98 | 5.09 | 0.11 | O7.5 IIIn((f)) | Hottest member; variability is disputable | |
| π Cassiopeiae | Cassiopeia | Paunzen & Maitzen (1998)[4] | 4.95 | 4.97 | 0.02 | A5 V + A5 V | |
| 31 Crateris (TY Corvi) | Corvus | 5.19 | 5.23 | 0.04 | B1.5 V | Unknown companion | |
| 14 Cephei (LZ Cephei) | Cepheus | Morris (1985)[2] | 4.67 | 4.71 | 0.04 | O9 III + O9.5 V | |
| HZ Canis Majoris | Canis Major | 5.28 | 5.34 | 0.06 | A0 EuCrSr | Long 6.4 year period;binary |
References
- ↑ Tkachenko, A. et al. (May 2016), "Stellar modelling of Spica, a high-mass spectroscopic binary with a β Cep variable primary component", Monthly Notices of the Royal Astronomical Society 458 (2): 1964–1976, doi:10.1093/mnras/stw255, Bibcode: 2016MNRAS.458.1964T
- ↑ 2.0 2.1 Morris, S. L. (August 1985). "The ellipsoidal variable stars". The Astrophysical Journal 295: 143. doi:10.1086/163359. ISSN 0004-637X. Bibcode: 1985ApJ...295..143M.
- ↑ 3.0 3.1 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: B/gcvs. Bibcode: 2009yCat....102025S.
- ↑ Paunzen, E.; Maitzen, H. M. (November 1998). "New variable chemically peculiar stars identifiedin the Hipparcosarchive". Astronomy and Astrophysics Supplement Series 133 (1): 1–6. doi:10.1051/aas:1998305. ISSN 0365-0138. Bibcode: 1998A&AS..133....1P.
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