HD 240430 ( Kronos ) - a star in the constellation Cassiopeia , which is located at a distance of about 350 light years from the Sun [1] . It is gravitationally bound to the star HD 240429 , forming a binary system . In the composition of the star’s atmosphere, chemical elements are found that are characteristic of rocky planets . It is assumed that the star has absorbed one or more of them.
| HD 240430 | |||
|---|---|---|---|
| Star | |||
  | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 350 St. years [1] | ||
| Constellation | Cassiopeia | ||
| Astrometry | |||
| Own movement (μ) | RA: 89,251 [2] Dec: -29,675 [2] | ||
| Parallax (π) | 9.35 ± 0.24 [2] mas | ||
| Specifications | |||
| Spectral class | G2V [3] | ||
| physical characteristics | |||
| Age | 4.28 billion [3] years | ||
| Temperature | 5803 [3] K | ||
| Metallicity | [Fe / H] = 0.20 [3] | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
| Sources: [2] | |||
Content
Features
HD 240430 - a star of the main sequence , in its characteristics is very similar to the Sun ; for the first time in astronomical literature is mentioned in the catalog of Henry Draper , published at the beginning of the XX century . The surface temperature of the star is about 5803 kelvin . The age of HD 240430 is estimated at approximately 4.28 billion years.
In 2017, a group of astronomers from Princeton University published an article on the results of research on HD 240430 [3] . An anomaly was discovered in the spectrum of the star - it showed that in the atmosphere of HD 240430 there is an increased content of elements such as aluminum , silicon , iron , chlorine , magnesium and yttrium . These substances are usually found in rocky planets. Therefore, astronomers have suggested that the star absorbed one or more of them. By analogy with the myths of Ancient Greece , which tells of the deity Kronos devouring his children, astronomers suggested giving him the unofficial name of a star. The second star, HD 240429, in which no anomalies were detected in the spectrum, was proposed to be named Krios, in honor of the lesser known brother Kronos. A complete revolution around the common center of mass of stars is performed in approximately 10 thousand years.
The total mass of the substance absorbed by the star HD 240430 is estimated at 15 Earth masses. According to the researchers, this could not have been a gas giant , because then lighter elements would have been observed in its spectrum. Scientists also admit that a star from a protoplanetary disk could be absorbed by a star, but they insist on a variant with a rocky planet.
See also
- Cassiopeia constellation star list
Notes
- ↑ 1 2 Devourer of planets? Princeton researchers dub star 'Kronos' . Princeton University (October 12, 2017). Date of treatment October 18, 2017.
- ↑ 1 2 3 4 SIMBAD - HD 240430 in the SIMBAD database . Date of treatment October 18, 2017.
- ↑ 1 2 3 4 5 Semyeong Oh et al. Kronos & Krios: Evidence for accretion of a massive, rocky planetary system in a comoving pair of solar-type stars . Arxiv.org (15 Sep 2017). Date of treatment October 18, 2017.
Links
- Star nicknamed Kronos after eating its own planetary children . New Scientist (September 21, 2017). Date of treatment October 18, 2017.
- Scientists have discovered the star-“devourer” of planets . news.rambler.ru (October 13, 2017). Date of treatment October 18, 2017.