Astronomy:Tycho G
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 25m 23.59s[1] |
| Declination | 64° 08′ 02.0″[1] |
| Apparent magnitude (V) | 18.71[2] |
| Characteristics | |
| Spectral type | G0/1 IV[3] |
| Astrometry | |
| Radial velocity (Rv) | −79.22[2] km/s |
| Proper motion (μ) | RA: −2.50[2] mas/yr Dec.: −4.22[2] mas/yr |
| Parallax (π) | 0.5118 ± 0.1208 mas |
| Distance | approx. 6,000 ly (approx. 2,000 pc) |
| Details | |
| Mass | 1.0[3] M☉ |
| Radius | 1.32–2.63[3] R☉ |
| Luminosity | 1.9–7.6[3] L☉ |
| Surface gravity (log g) | 4.0[2] cgs |
| Temperature | 6,025[2] K |
| Metallicity | −0.13[2] |
| Rotational velocity (v sin i) | < 6[2] km/s |
| Age | 5.7[2] Gyr |
| Other designations | |
2MASS J00252358+6408019, [RCM2004]+Tycho G | |
| Database references | |
| SIMBAD | data |
Tycho G has been proposed as the surviving binary companion star of the SN 1572 supernova event. The star is located about 6,400±1,500 light-years away in the constellation Cassiopeia. It is a subgiant, similar to the Sun in temperature, but more evolved and luminous.
Origin of the name
The supernova SN 1572 is often called "Tycho's supernova", named after Tycho Brahe who observed the "new star" in 1572. The postfix "G" originates from the candidate companion stars considered in a 2004 study, labelled Tycho A to Tycho V.[4]
Evidence for companion hypothesis
Tycho G is travelling away from us at nearly 80 km/s, much faster than the mean velocity of other stars in its stellar neighbourhood. It matches the properties of some models for the pre-supernova star system, although other studies exclude it.[5]
See also
References
- ↑ 1.0 1.1 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues 2246: II/246. Bibcode: 2003yCat.2246....0C. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Kerzendorf, Wolfgang E.; Yong, David; Schmidt, Brian P.; Simon, Joshua D.; Jeffery, C. Simon; Anderson, Jay; Podsiadlowski, Philipp; Gal-Yam, Avishay et al. (2013). "A High-resolution Spectroscopic Search for the Remaining Donor for Tycho's Supernova". The Astrophysical Journal 774 (2): 99. doi:10.1088/0004-637X/774/2/99. Bibcode: 2013ApJ...774...99K.
- ↑ 3.0 3.1 3.2 3.3 González Hernández, Jonay I.; Ruiz-Lapuente, Pilar; Filippenko, Alexei V.; Foley, Ryan J.; Gal-Yam, Avishay; Simon, Joshua D. (2009). "The Chemical Abundances of Tycho G in Supernova Remnant 1572". The Astrophysical Journal 691 (1): 1–15. doi:10.1088/0004-637X/691/1/1. Bibcode: 2009ApJ...691....1G.
- ↑ Ruiz-Lapuente, Pilar; Comeron, Fernando; Méndez, Javier; Canal, Ramon; Smartt, Stephen J.; Filippenko, Alexei V.; Kurucz, Robert L.; Chornock, Ryan et al. (2004). "The binary progenitor of Tycho Brahe's 1572 supernova". Nature 431 (7012): 1069–1072. doi:10.1038/nature03006. PMID 15510140. Bibcode: 2004Natur.431.1069R.
- ↑ Pan, Kuo-Chuan; Ricker, Paul M.; Taam, Ronald E. (2014). "Search for Surviving Companions in Type Ia Supernova Remnants". The Astrophysical Journal 792 (1): 71. doi:10.1088/0004-637X/792/1/71. Bibcode: 2014ApJ...792...71P.
External links
- Discovery of the binary companion of Tycho Brahe's supernova
- https://jumk.de/astronomie/special-stars/tycho-g.shtml
 |  |
