HD 153261

HD 153261 is the Henry Draper Catalogue designation for a star in the southern constellation of Ara. It has an apparent visual magnitude of 6.137,[2] placing it near the threshold of naked eye visibility. According to the Bortle Dark-Sky Scale, it can be viewed from dark suburban or rural skies. Based upon an annual parallax shift of just 2.32 mas,[1] it is located at a distance of around 1,400 light-years (430 parsecs) from Earth.

HD 153261
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 01m 47.3875s[1]
Declination –58° 57′ 29.681″[1]
Apparent magnitude (V) 6.137[2]
Characteristics
Spectral type B1 V:ne[3] or B2 IVne[4]
U−B color index –0.956[2]
B−V color index –0.078[2]
Astrometry
Radial velocity (Rv)–6[5] km/s
Proper motion (μ) RA: –2.91[1] mas/yr
Dec.: –9.01[1] mas/yr
Parallax (π)2.32 ± 0.38[1] mas
Distanceapprox. 1,400 ly
(approx. 430 pc)
Details
Mass10.1 ± 0.3[4] M☉
Radius4.5[6] R☉
Luminosity (bolometric)11,045[7] L☉
Temperature21,150[7] K
Age20.4 ± 0.4[4] Myr
Other designations
CD–58 6607, HD 153261, HIP 83323, HR 6304, SAO 244362, V828 Arae.[8]
Database references
SIMBADdata

This star has been catalogued with a stellar classification of B1 V:ne[3] or B2 IVne,[4] indicating that it is either a main sequence or a subgiant star. The 'n' indicates a nebulous spectrum created by the Doppler shift-broadened absorption lines from a rapid rotation, while the 'e' means this is a Be star, with the spectrum showing emission lines from hot, circumstellar gas. HD 153261 display some variability with an amplitude of 0.090 in magnitude, and is a suspected spectroscopic binary.[9]

HD 153261 is a large star with over ten[4] times the Sun's mass and around 4.5[6] the radius of the Sun. It shines with more than 11,000[7] times the brightness of the Sun, with this energy being radiated into space at an effective temperature of 21,150 K.[7] At this heat, it glows with the blue-white hue of a B-type star.[10]

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. Kozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", Astronomy and Astrophysics Supplement Series, 61: 387–405, Bibcode:1985A&AS...61..387K.
  3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
  4. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
  5. Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), The Revision of the General Catalogue of Radial Velocities, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E.
  6. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  7. Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483.
  8. "HR 6304". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-08-03.
  9. Lefèvre, L.; et al. (November 2009), "A systematic study of variability among OB-stars based on HIPPARCOS photometry", Astronomy and Astrophysics, 507 (2): 11411201, Bibcode:2009A&A...507.1141L, doi:10.1051/0004-6361/200912304.
  10. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-07-21.
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