Sher 25

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Star
Sher 25
The emission nebula NGC 3603 recorded by the Hubble Space Telescope (true color). Sher 25 is the bright star to the left above the star cluster
The emission nebula NGC 3603 recorded by the Hubble Space Telescope (true color). Sher 25 is the bright star to the left above the star cluster
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Keel of the ship
Right ascension 11 h 15 m 7.65 s
declination -61 ° 15 ′ 17.6 ″
Apparent brightness 12.23 mag
Typing
B − V color index +1.42 
U − B color index +0.19 
Spectral class B1 Iab
Astrometry
distance 25,000  Lj
7.600  pc  
Visual absolute brightness M vis approx. −7.8 mag
Bolometric absolute brightness M bol approx. −9.7 mag
Physical Properties
Dimensions 40 - 52  M ☉
Effective temperature 22,000  K
Age 4 million  a

Sher 25 is a star located almost 25,000 light years from Earth in the galactic emission nebula NGC 3603 . With an apparent magnitude of 12.23 mag, it can be observed in the southern constellation Kiel of the ship under ideal conditions with a telescope with an opening of at least 200 mm.

The mass of the blue supergiant is about 40 to 52 solar masses , at the beginning of its main sequence phase it was 60 solar masses. At this point in time, the star was a supergiant of spectral class B3 I. It is surrounded by a circumstellar nebula consisting of an equatorial ring that was ejected 6560 years ago and a bipolar discharge from 6700 years ago . Sher 25 was first described and named by David Sher in an article published in 1965 in the Monthly Notices of the Royal Astronomical Society about measuring the distance to five open star clusters .

Sher 25 is considered a candidate for a Type II supernova .

The emission nebula NGC 3603 recorded by the Hubble Space Telescope (false colors visible + infrared light). Sher 25 is the bright star to the right above the star cluster

Individual evidence

  1. ↑ a b c d e f g h i j Melena, NW; Massey, P .; Morrell, NI; Zangari, AM (2008). "The Massive Star Content of Ngc 3603" . The Astronomical Journal 135 (3) (PDF; 874 kB)
  2. ↑ a b Sher, David: Distances of five open cluster near Eta Carinae , Monthly Notices of the Royal Astronomical Society, 1965, Vol. 129, p. 250, bibcode : 1965MNRAS.129..237S
  3. ↑ a b Smartt, SJ; Lennon, DJ; Kudritzki, RP; Rosales, F .; Ryans, RSI; Wright, N. (2002). "The evolutionary status of Sher 25 - Implications for blue supergiants and the progenitor of SN 1987A" . Astronomy and Astrophysics 391 (3) (PDF; 322 kB)
  4. ↑ a b Hendry, MA; Smartt, SJ; Skillman, ED; Evans, CJ; Trundle, C .; Lennon, DJ; Crowther, PA; Hunter, I. (2008). "The blue supergiant Sher 25 and its intriguing hourglass nebula" . Monthly Notices of the Royal Astronomical Society 388 (3)

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