Jump to content
 







Main menu
   


Navigation  



Main page
Contents
Current events
Random article
About Wikipedia
Contact us
Donate
 




Contribute  



Help
Learn to edit
Community portal
Recent changes
Upload file
 








Search  

































Create account

Log in
 









Create account
 Log in
 




Pages for logged out editors learn more  



Contributions
Talk
 



















Contents

   



(Top)
 


1 References  














HD 83953






Português
Русский
Slovenčina
Svenska

 

Edit links
 









Article
Talk
 

















Read
Edit
View history
 








Tools
   


Actions  



Read
Edit
View history
 




General  



What links here
Related changes
Upload file
Special pages
Permanent link
Page information
Cite this page
Get shortened URL
Download QR code
Wikidata item
 




Print/export  



Download as PDF
Printable version
 
















Appearance
   

 






From Wikipedia, the free encyclopedia
 


HD 83953
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 09h41m 17.00785s[1]
Declination −23° 35′ 29.4325″[1]
Apparent magnitude (V) 4.76[2]
Characteristics
Spectral type B5 V[3]
B−V color index −0.117±0.015[2]
Astrometry
Radial velocity (Rv)+16.05±1.5[4] km/s
Proper motion (μ) RA: −29.969[1] mas/yr
Dec.: +1.914[1] mas/yr
Parallax (π)6.5733 ± 0.2851 mas[1]
Distance500 ± 20 ly
(152 ± 7 pc)
Absolute magnitude (MV)−1.19[2]
Details
Mass4.57±0.08[5] M
Radius4.00±0.08[6] R
Luminosity708+60
−55
[5] L
Surface gravity (log g)2.54±0.03[6] cgs
Temperature15,000±150[6] K
Rotational velocity (v sin i)315[5][7] km/s
Other designations

I Hya, BD−22° 2684, HD 83953, HIP 47522, HR 3858, SAO 177840[8]

Database references
SIMBADdata

HD 83953 (I Hydrae) is a single,[9] blue-white hued star in the equatorial constellationofHydra. It is visible to the naked eye, having an apparent visual magnitude of 4.76.[2] Based upon an annual parallax shiftof6.6 mas,[1] the distance to this star is estimated as 500 light years. It is moving further from Earth with a heliocentric radial velocity of +16 km/s.[4]

This is a B-type main-sequence star with a stellar classification of B5 V.[3] It has been known to be a Be star since 1926, when an emission line was discovered in the stellar spectrumbyMount Wilson Observatory.[10] This energy is coming from a circumstellar envelope of heated gas that has been expelled from the central star and formed a thin orbiting disk.[11] HD 83953 is spinning rapidly with a projected rotational velocity of 315 km/s, giving the star an oblate shape with an equatorial bulge that is 18% larger than the polar radius.[7]

HD 83953 has 4.6[5] times the mass of the Sun and 4.0[6] times the Sun's radius. It is radiating 708[5] times the Sun's luminosity from its photosphere at an effective temperature of 15,000 K.[6]

References[edit]

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  • ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  • ^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  • ^ a b Becker, Juliette C.; et al. (April 2015), "Extracting Radial Velocities of A- and B-type Stars from Echelle Spectrograph Calibration Spectra", The Astrophysical Journal Supplement Series, 217 (2): 13, arXiv:1503.03874, Bibcode:2015ApJS..217...29B, doi:10.1088/0067-0049/217/2/29, S2CID 33968873, 29.
  • ^ a b c d e Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  • ^ a b c d e Arcos, C.; et al. (March 2018), "Stellar parameters and H α line profile variability of Be stars in the BeSOS survey", Monthly Notices of the Royal Astronomical Society, 474 (4): 5287–5299, arXiv:1711.08675, Bibcode:2018MNRAS.474.5287A, doi:10.1093/mnras/stx3075.
  • ^ a b Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
  • ^ "HD 83953". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-25.
  • ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  • ^ Merrill, Paul W.; Burwell, Cora G. (September 1933), "Catalogue and Bibliography of Stars of Classes B and A whose Spectra have Bright Hydrogen Lines", Astrophysical Journal, 78: 87, Bibcode:1933ApJ....78...87M, doi:10.1086/143490.
  • ^ Arcos, C.; et al. (June 2017), "Evidence for Different Disk Mass Distributions Between Early and Late-Type Be Stars in the BeSOS Survey", The Astrophysical Journal, 842 (1): 18, arXiv:1704.08133, Bibcode:2017ApJ...842...48A, doi:10.3847/1538-4357/aa6f5f, S2CID 119418279, 48.

  • Retrieved from "https://en.wikipedia.org/w/index.php?title=HD_83953&oldid=1187271141"

    Categories: 
    B-type main-sequence stars
    Be stars
    Hydra (constellation)
    Bayer objects
    Durchmusterung objects
    Henry Draper Catalogue objects
    Hipparcos objects
    Bright Star Catalogue objects
    Hidden categories: 
    Articles with short description
    Short description is different from Wikidata
     



    This page was last edited on 28 November 2023, at 06:15 (UTC).

    Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.



    Privacy policy

    About Wikipedia

    Disclaimers

    Contact Wikipedia

    Code of Conduct

    Developers

    Statistics

    Cookie statement

    Mobile view



    Wikimedia Foundation
    Powered by MediaWiki