TW Horologii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Horologium |
| Right ascension | 03h 12m 33.160s[1] |
| Declination | −57° 19′ 17.5790″ [1] |
| Apparent magnitude (V) | 5.52 - 5.95[2] |
| Characteristics | |
| Spectral type | C-N4IIIb: (C2 3.5)[3] |
| U−B color index | +2.93[4] |
| B−V color index | +2.52[4] |
| Variable type | SRb[2] |
| Astrometry | |
| Radial velocity (Rv) | 14.3 ± 2 km/s |
| Proper motion (μ) | RA: 18.44 ± 0.31[1] mas/yr Dec.: 13.20 ± 0.35[1] mas/yr |
| Parallax (π) | 3.11 ± 0.37[1] mas |
| Distance | approx. 1,000 ly (approx. 320 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
TW Horologii is a star in the constellation Horologium. A semiregular variable and ageing red giant, it is in the asymptotic giant branch stage of its lifespan.[6]
In 2013 the luminosity of Mira variables, based on Hipparcos parallaxes, was used to calibrate a Period-luminosity relationship for Carbon stars. The absolute magnitude of TW Horologii was calculated to be -4.62.[6]
References
- 1 2 3 4 5 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.
- 1 2 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.
- ↑ Barnbaum, Cecilia; Stone, Remington P. S.; Keenan, Philip C. (1996). "A Moderate-Resolution Spectral Atlas of Carbon Stars: R, J, N, CH, and Barium Stars". Astrophysical Journal Supplement. 105: 419. Bibcode:1996ApJS..105..419B. doi:10.1086/192323.
- 1 2 Nicolet, B. (1978). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy and Astrophysics Supplement Series. 34: 1–49. Bibcode:1978A&AS...34....1N.
- ↑ "V* TW Hor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 March 2016.
- 1 2 Guandalini, R.; Cristallo, S. (2013). "Luminosities of carbon-rich asymptotic giant branch stars in the Milky Way". Astronomy & Astrophysics. 555: 7. arXiv:1305.4203. Bibcode:2013A&A...555A.120G. doi:10.1051/0004-6361/201321225. A120.
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