Trumpler 16

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Open star cluster
Trumpler 16
The inner region of the Carina Nebula in the near infrared. Trumpler 16 is the star cluster to the left of Eta Carinae, the brightest star in the image.
The inner region of the Carina Nebula in the near infrared . Trumpler 16 is the star cluster to the left of Eta Carinae , the brightest star in the image.
AladinLite
Constellation Keel of the ship
Position
equinox : J2000.0
Right ascension 10 h 45.1 m
declination -59 ° 43.0 ′
Appearance

Brightness  (visual) 5.0 likes
Physical data

Affiliation Milky Way
Radial velocity −25.0 km / s
distance  approx. 9300 ly
history
Catalog names
 C 1043-594 •

Trumpler 16 ( Tr 16 ) is a massive open star cluster that is home to some of the most luminous stars in the galaxy . It is located in the Carina Nebula complex of the Sagittarius arm , about 9,270 light years (2,842 pc ) from Earth. One of its stars, Eta Carinae , can be seen with the naked eye in the tropics and further south.

description

The brightest members of the star cluster are Eta Carinae and WR 25 , whose luminosity is several million times that of the Sun, and there are three other extreme stars of the spectral class O3. Eta Carinae and WR 25 are both double stars , the main components of which each make the greatest contribution to luminosity, but whose companions themselves are more massive and brighter than most stars. WR 25 is estimated to be the brighter of the two across all wavelengths, namely 6,300,000 times the solar luminosity ( absolute brightness −12.25 mag) compared to 5,000,000 times the solar luminosity (absolute brightness −12, 0 likes). In any case, Eta Carinae appears to be by far the brightest object because, on the one hand, it is more luminous in the visible area and, on the other hand, it is embedded in a fog that intensifies the brightness. WR 25 is very hot and emits mostly in the ultraviolet range.

Carina OB1

Trumpler 16 and Trumpler 14 are the most important star clusters in Carina OB1, an extensive stellar association in the Sagittarius arm . Another star cluster in Carina OB1, Collinder 228, is believed to be an extension of Trumpler 16, which appears only separated by a visually intervening band of dust. The spectral types of stars indicate a single star formation wave. Due to the extreme luminosity, the stellar winds , similar to the Pleiades , drive away the dust clouds. In a few million years after the brightest stars explode as supernovae , the star cluster will gradually disintegrate. Trumpler 16 contains most of the eastern stars of the Carina OB1 association.

Gaia DR2

The star catalog Gaia DR2 contains parallaxes for many stars considered to be members of Trumpler 16. Accordingly, the four hottest O-class stars in this region have very similar parallaxes with a mean value of 0.383 ± 0.01 mas . Many of the other supposed members show clearly different parallaxes and could therefore be foreground or background objects. For Trumpler 16, this results in a distance of about 2,600 pc, which is significantly further than the precisely known distance from Eta Carinae.

gallery

  • Carina OB1 Association, the Trumpler 16 area is outlined.

  • Some stars in Tr 16: WR 25 and Tr16-244 are the brightest and third brightest in this picture, the second brightest is just a foreground object.

Individual evidence

  1. ↑ a b c d Database link to Trumpler 16 on SIMBAD .
  2. ↑ Scott J. Wolk, Patrick S. Broos, Konstantin V. Getman, Eric D. Feigelson, Thomas Preibisch, Leisa K. Townsley, Junfeng Wang, Keivan G. Stassun, Robert R. King, Mark J. McCaughrean, Anthony FJ Moffat , Hans Zinnecker: The Chandra Carina Complex Project View of Trumpler 16 . In: The Astrophysical Journal Supplement . 194, No. 1, May 2011. arxiv : 1103.1126 . bibcode : 2011ApJS..194 ... 12W . doi : 10.1088 / 0067-0049 / 194/1/12 .
  3. ↑ G. Carraro, M. Romaniello, P. Ventura, F. Patat: The star cluster Collinder 232 in the Carina complex and its relation to Trumpler 14/16 . In: Astronomy and Astrophysics . 418, No. 2, May 2004, pp. 525-537. arxiv : astro-ph / 0401144 . bibcode : 2004A & A ... 418..525C . doi : 10.1051 / 0004-6361: 20034335 .
  4. ↑ Kris Davidson, Greta Helmel, Roberta M. Humphreys: Gaia, Trumpler 16, and Eta Carinae . In: Research Notes of the American Astronomical Society . 2, No. 3, 2018, p. 133. arxiv : 1808.02073 . bibcode : 2018RNAAS ... 2c.133D . doi : 10.3847 / 2515-5172 / aad63c .

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