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Tycho G

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Tycho G
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{{Starbox begin | name=Tycho G}}{{Starbox image < 6| luminosity = 1.9 - 7.6| temperature = 6,025| gravity = 4.0}}{{Starbox catalog | names = 2MASS J00252358+6408019, [RCM2004]+Tycho G}}{{Starbox reference | Simbad = %5BRCM2004%5D%20Tycho%20G}}{{Starbox end}}Tycho G has been proposed as the surviving binary companion star of the SN 1572supernova event. The star is located about 12,000 light-years away in the constellation Cassiopeia. It is a subgiant, similar to our 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.

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.JOURNAL, 2014ApJ...792...71P, 1407.6829, Search for Surviving Companions in Type Ia Supernova Remnants, The Astrophysical Journal, 792, 71, Pan, Kuo-Chuan, Ricker, Paul M., Taam, Ronald E., 2014, 10.1088/0004-637X/792/1/71,

See also

References

External links

{{Stars of Cassiopeia}}

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Image:SN1572.Companion.jpg>300pxHubble Space Telescope>Hubble| credit=NASA, ESA, CXO and P. Ruiz-Lapuente (University of Barcelona)}}{{Starbox observe | epoch=J2000 Cassiopeia (constellation)>Cassiopeia 0023.59}}6402.0}}| appmag_v=18.71}}{{Starbox character | class=G0/1 IV | b-v=| u-b= | variable=}}{{Starbox astrometry | radial_v=−79.22| prop_mo_ra=−2.50| prop_mo_dec=−4.22| p_error=| dist_pc=3,700| absmag_v=}}{{Starbox detail | age_gyr = 5.7| metal = −0.13| mass = 1.0| radius = 1.32 - 2.63| rotational_velocity =