SAO 244567 ( CD-59 ° 6479 ) is a star in the altar constellation. It is located at a distance of about 5218 light years [1] from the Sun. Located in the center of the Skat nebula .
| SAO 244567 | |||
|---|---|---|---|
| Star | |||
  | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 5218 St. years (1600 pc ) [1] | ||
| Visible magnitude ( V ) | 12.62 [1] | ||
| Constellation | Altar | ||
| Astrometry | |||
| Radial velocity ( R v ) | 12.6 [2] km / s | ||
| Own movement (μ) | RA: -0.8 [2] Dec: -4.0 [2] | ||
| Specifications | |||
| Spectral class | B3III [2] | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
| Sources: [2] | |||
Content
Features
SAO 244567 is a star of 12.62 visible magnitude. It can only be observed with a telescope in the southern hemisphere of the Earth. The distance to it was previously determined at 5.64 kiloparsecs . However, later measurements of luminosity, based on the calculation of surface temperature and surface gravity , made it possible to refine the distance to 1.6 kiloparsecs [1] . The star aroused great interest among astronomers, since over the past 45 years of observations began to change beyond recognition. At first, it was a star of the main sequence , which after many billions of years of evolution turned into a red giant . Then it decreased in size and began to cool gradually. But in a very short period of time - from 1971 to 2002. - the temperature of its surface increased sharply to almost 40 thousand Kelvin . And new observations with the Cosmic Origins Spectrograph (COS) instrument installed on the Hubble telescope showed that the star began to cool and swell. In the history of astronomy, this is the first time that scientists have been able to observe such a fast evolution of a star. Such a “rebirth”, according to researchers, is associated with a helium flare that occurred outside the star’s core [3] . Similar events were observed among the stars of FG Strela and the Sakurai object . However, to confirm this theory, follow-up observations of SAO 244567 are required.
Gal. Longitude 331.3102 °
Gal.-latitude -12.1642 °
Distance 5218 St.
See also
- List of Stars of the Altar Constellation
Notes
- ↑ 1 2 3 4 Bradley E. Schaefer, Zachary I. Edwards. Photometry of the Stingray Nebula (V839 Ara) from 1889-2015 Across the Ionization of Its Planetary Nebula . Arxiv.org (3 Sep 2015). Date of appeal April 10, 2018.
- ↑ 1 2 3 4 5 SIMBAD - SAO 244567 in the SIMBAD database . Date of appeal April 10, 2018.
- ↑ N. Reindl, T. Rauch, MM Miller Bertolami, H. Todt, K. Werner. Breaking news from the HST: The central star of the Stingray Nebula is now returning towards the AGB . Arxiv.org (22 Sep 2016). Date of appeal April 10, 2018.
Links
- Astronomers observe star reborn in a flash . NASA (September 13, 2016). Date of appeal April 10, 2018. (unavailable link)
- Astronomers saw the evolution of a star in real time . N + 1 (September 14, 2016). Date of appeal April 10, 2018.
- Evolution of SAO 244567 , Youtube .