R Centauri
R Centauri
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
Constellation | Centaurus |
Right ascension | 14h 16m 34.321s[1] |
Declination | −59° 54′ 49.29″[1] |
Apparent magnitude (V) | 5.2 - 11.5[2] |
| Characteristics | |
Spectral type | M5IIe[3](M4e-M9.5[2]) |
| U−B color index | +1.24[citation needed] |
| B−V color index | +2.04[citation needed] |
Variable type | Mira[2] |
| Astrometry | |
| Radial velocity (Rv) | −20[citation needed] km/s |
| Proper motion (μ) | RA: -9.07 ± 0.91[1] mas/yr Dec.: -7.04 ± 0.71[1] mas/yr |
| Parallax (π) | 2.60 ± 0.76[1] mas |
| Distance | approx. 1,300 ly (approx. 400 pc) |
| Absolute magnitude (MV) | −1.84[citation needed] |
| Details | |
| Luminosity | 47,000[3] L☉ |
| Temperature | 3,450[3] K |
| Other designations | |
R Centauri, HR 5326, HD 124601, CP−59°5476, HIP 69754, SAO 241580, GC 19234, CCDM J14166-5955 | |
| Database references | |
| SIMBAD | data |
R Centauri (R Cen) is a Mira variable star in the constellation Centaurus. It is approximately 1,300 light years from Earth.
R Centauri is a Mira variable and its brightness varies from magnitude +5.2 to +11.5 with a period of about 500 days. It used to have an unusual double-peaked light curve, but by 2001 this had reverted to an almost normal single-peaked curve. Prior to 1950 the period was about 550 days, but since then has decreased to about 500 days. A 2016 analysis of ASAS data derived a period of 498.84 days.[4]
It is thought that the unusual behaviour of R Centauri is caused by a flash in the helium shell around its core, which occurs periodically in asymptotic giant branch (AGB) stars as the mass of the helium shell increases with helium from the outer hydrogen shell.[5]
It is also an H2O maser.[citation needed]
References[edit]
^ abcde 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..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
Vizier catalog entry
^ abc Samus, N. N.; Durlevich, O. V.; 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. Bibcode:2009yCat....102025S.
^ abc Verhoelst, T; Van Der Zypen, N; Hony, S; Decin, L; Cami, J; Eriksson, K (2009). "The dust condensation sequence in red supergiant stars". Astronomy & Astrophysics. 498: 127. arXiv:0901.1262. Bibcode:2009A&A...498..127V. doi:10.1051/0004-6361/20079063.
^ Vogt, N; Contreras-Quijada, A; Fuentes-Morales, I; Vogt-Geisse, S; Arcos, C; Abarca, C; Agurto-Gangas, C; Caviedes, M; Dasilva, H; Flores, J; Gotta, V; Peñaloza, F; Rojas, K; Villaseñor, J. I (2016). "Determination of Pulsation Periods and Other Parameters of 2875 Stars Classified As Mira in the All Sky Automated Survey (Asas)". The Astrophysical Journal Supplement Series. 227: 6. arXiv:1609.05246. Bibcode:2016ApJS..227....6V. doi:10.3847/0067-0049/227/1/6.
^ Hawkins, G; Mattei, J. A; Foster, G (2001). "R Centauri: An Unusual Mira Variable in a He‐Shell Flash". Publications of the Astronomical Society of the Pacific. 113 (782): 501. Bibcode:2001PASP..113..501H. doi:10.1086/319542.
Categories:
- Centaurus (constellation)
- Mira variables
- M-type bright giants
- Objects with variable star designations
- Henry Draper Catalogue objects
- HR objects
- Hipparcos objects
- Durchmusterung objects
- Emission-line stars
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