Men (constitution) – Wikipedia, free encyclopedia

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Table
Mensa
Mensa constellation map.svg

Celeste letter of the constellation of the table in which its main stars appear.

Nomenclature
Name
in Spanish 		Table
Name
In latin 		Mensa
Genitive Table
Abbreviation Men
Description
Introduced by Nicolas-Louis de Lacaille
Surface 153.5 square degrees
0.372% (position 75)
Ascensión
straight 		Between 3 h 12.93 m
y 7 h 36,86 m
Decline Between -85.26 ° and -69.75 °
Visibility Complete:
Between 90 ° S and 5 ° N
Partial:
Between 5 ° N and 20 ° N
Number
of stars 		22 (m in <6.5)
Star
brighter 		Alfa table (m in 5.08)
Objects
Messier 		None
NGC objects 74
Objects
Caldwell 		None
Rains
meteor 		None
Constellations
adjoining 		5 constellations
Better month to see the constellation
Local time: 21:00
We January
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Mensa (Latin for mesa ) is an southern constellation, introduced by Nicolas Louis de Lacaille under the name of Mountain table (Latin for plateau ). The name refers specifically to the mountain of the table (literal equivalent to Mons Mensae in Latin) in South Africa, from where Lacaille made important observations of the southern sky.

The constellation forms a wedge in the form of a key in the sky and extends from approximately 4 h to 7.5 h in straight ascent, and from 71 to 85.5 degrees of decline. After the circumpolar constellation of Octans, it is the southernmost of the constellations. Because of this, it is essentially non -observable from the northern hemisphere. In addition to those already mentioned, other neighboring constellations are Chamaeleon, Hydrus and Voens.

Since it was devised in the seventeenth century, and is located in the southern hemisphere, it was not visible for Mediterranean peoples or ancient cultures, therefore there is no mythology associated with this constellation.

Outstanding features [ To edit ]

Mensa does not contain bright stars, being its main star α Mensae barely observable to the naked eye. This is a yellow spectral yellow G7V type with some similarity with the sun: it has a surface temperature slightly lower than that of our star —5587 k – and a bolometric luminosity equivalent to 83% of the solar luminosity. [ first ] It is 33 light years from Earth.

The following stars in terms of brightness are γ mensae, K2III type orange giant [ 2 ] Distant 105 light years, and β Mensae, G8III type giant much further away, as it is 660 light years. [ 3 ] ​

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ž tables are otra Enana Amarilla, the tipo espectral G0V. [ 4 ] With a temperature of 5996 k and a luminosity 49% higher than that of the sun, it has a metallicity slightly larger than solar ([Fe/h] = +0.03); With the exception of aluminum, its chemical composition is very similar to that of our star. [ 5 ] Around π mensae a “superstrara” planet has been detected with an orbital period of 6.28 days and a brown dwarf with an orbital period of 2093 days. [ 6 ] ​ [ 7 ] ​ [ 8 ] ​

In two other stars of the constellation extra planets have been discovered. HD 39194 is a speral orange K0V type orange [ 9 ] With three planets that orbit 0.05, 0.09 and 0.17 UA of the star. All of them are “superstarras” with masses between 3.7 and 5.9 times the terrestrial mass. [ ten ] ​
Likewise, HD 38283 – officially called Bubup— [ 11 ] It is a F9.5v star [ twelfth ] The Un Planeta A 1.02 UA.

The great cloud of Magallanes, a satellite galaxy of the Milky Way, is partially within the limits of Mensa, although most of them is located in the neighboring constellation of Dorado. Among the stars of this galaxy is W Mensae, a white-yellow supergigent of type F5I and variable R Coronae Borealis. [ 13 ] NGC 1987 is a globular cluster that also belongs to the great cloud of Magallanes.

The first image taken by the X-ray Observatory was PKS 0637-752, a quasar in Mensa with a large amount of gas visible both in the visible spectrum and in X-rays. [ 14 ] ​

Main stars [ To edit ]

  • α Mensae, yellow dwarf G7V type in many aspects similar to the sun. With magnitude 5.08 is the star with the greatest brightness in the constellation.
  • π mensae, yellow dwarf of magnitude 5.65 located at 59 light years; Around it orbits a planet at 0.07 UA and, in a much more external orbit, a brown dwarf at 3.28 UA.
  • 31 Mensae (Tz Mensae), eclipsest binary consisting of two white variable brightness stars between 6,19 and 6.87 magnitude.
  • W Mensae, Ra Cronae Borealis variable in the great cloud of Magallanes whose brightness reaches – in its maximum – magnitude 13.4.
  • UX table, binary eclipseate of magnitud 7,20.
  • WX Mensae, red giant and irregular variable whose brightness fluctuates between 5.72 and 5.87.
  • Ao Mensae, variable by draconis member of the Beta Pictoris star association.
  • HD 39194, orange dwarf where three extrasolary planets have been discovered.

Other stars with Bayer denomination [ To edit ]

  • β Men 5,30; γ Men 5,18; δ Men 5,67; ε Men 5,54; ζ Men 5,61; θ Men 5,45; η Men 5,47; ι Men 6,04; κ Men 5,46; λ Men 6,54; μ Men 5,53; ν Men 5,78; ξ Men 5,84

Deep sky objects [ To edit ]

References [ To edit ]

  1. ↑ Valenti, Jeff A.; Fischer, Debra A. (July 2005). «Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs». The Astrophysical Journal Supplement Series 159 (1): 141-166. Bibcode: 2005ApJS..159..141V . doi: 10.1086/430500 .
  2. ↑ gam Men — High proper-motion Star (Simbad)
  3. ↑ bet Men — Star (Simbad)
  4. ↑ pi. Men — High proper-motion Star (Simbad)
  5. ↑ Bond, J. C.; Lauretta, D. S.; Tinney, C. G.; Butler, R. P.; Marcy, G. W.; Jones, H. R. A.; Carter, B. D.; O’Toole, S. J.; Bailey, J. (2008). «Beyond the Iron Peak: r- and s-Process Elemental Abundances in Stars with Planets» . The Astrophysical Journal 682 (2). pp. 1234-1247 .
  6. ↑ Jones, Hugh R. A .; Paul Butler, r .; Tinney, C. g .; Marcy, Geoffrey W .; Penny, Alan J .; McCarthy, Chris; Carter, Brad d .; Pourbaix, Dimitri (2002). «A probable planetary companion to HD 39091 from the Anglo-Australian Planet Search» . Monthly Notices of the Royal Astronomical Society 333 (4). pp. 871–875 .
  7. ↑ Huang et al. (2018). «TESS Discovery of a Transiting Super-Earth in the Π Mensae System». The Astrophysical Journal Letters . arXiv: 1809.05967v1 .
  8. ↑ Damasso, M.; Sozzetti, A.; Lovis, C.; Barros, S. C. C.; SOUSA, S. G.; LOVE, O. D. S.; Faria, J. P.; Lillo-box, J.; Cristiani, S.; Pepe, F.; rebolo, R.; Santos, N. C.; Zapatero Osorio, M. R.; González Hernández, J. I.; Amate, M.; Pasquini, L.; Zerbi, F. M.; Didibeyan, V.; Abreu, M.; affolter, M. ; … (2020). A precise architecture characterization of the π Men planetary system . Arxiv: 2007.06410 [Astro-Ph.EP] . Retrieved on April 7, 2021 .
  9. ↑ HD 39194 — High proper-motion Star (Simbad)
  10. ↑ Mayor, M.; Marmier, m.; Lovis, c.; Udry, s.; Segransan, d.; Pepe, f.; Benz, w.; Bertaux, J. -L.; Bouchy, f.; Dumusque, x.; Lo curto, g.; Mordasini, c.; Queloz, d.; Santos, N. C. (2011). «The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets» . EPRINT ARXIV: 1109.2497 .
  11. ↑ «Naming stars (IAU)» . Retrieved on April 5, 2021 .
  12. ↑ HD 38283 — High proper-motion Star (Simbad)
  13. ↑ Milone, Luis A. (1990). «Identification charts for southern R Coronae Borealis-stars». Astrophysics and Space Science 172 (2): 263. Bibcode: 1990Ap&SS.172..263M .
  14. ↑ Schwartz, D.A.; Marshall, H.L.; Lovell, J.E.J. et al. (2000). «Chandra Discovery of a 100 kiloparsec X-Ray Jet in PKS 0637-752». The Astrophysical Journal 540 (2): 69-72. Bibcode: 2000APJ … 540l..69s . S2CID  17424140 . arXiv: Astro -ph/0005255 . doi: 10.1086/312875 .

external links [ To edit ]

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